two wharves A and B are directly opposite each other on a 40m wide river which flows in the direction shown. a boat leaves A and heads at constant speed at right angles to the flow of the river. it lands at point C, with the trip taking 20 seconds.
find;
a) the displacement from C to A
b) the speed of the boat as seen by people standing at A.
c) the speed of the water in the river
d) the speed of the boat as seen by a fish drifting with the river.
e) Draw a vector diagram and u
se it to find the direction the boat should head ( at the same constant speed as before) if it is to travel directly from A to B.
Answers
Answer:
a)40 meters
b)2 m/s
c)2 m/s
d)0 m/s
e)45 degrees northeast
Explanation:
a) The displacement from C to A is the distance directly across the river, which is 40 meters.
b) The speed of the boat as seen by people standing at A is the magnitude of the boat's velocity vector, which is equal to the displacement divided by the time taken:
Speed = displacement / time = 40 m / 20 s = 2 m/s.
c) Let v be the speed of the water in the river. The boat is moving at right angles to the flow of the river, so the water exerts a perpendicular force on the boat. The time taken for the boat to travel from A to C is 20 seconds, during which time the boat will have been carried downstream by the river by a distance equal to v times the time taken.
Distance carried downstream = v × time = v × 20 m.
Since the boat landed at C, which is directly across the river from A, the distance it traveled horizontally is 40 meters. Therefore:
40 m = (boat speed) × (time taken) = (boat speed) × 20 s.
Hence, the speed of the boat is:
Boat speed = 40 m / 20 s = 2 m/s.
So, we have two equations:
Distance carried downstream = v × 20 m
Boat speed = 2 m/s
From the first equation, we get:
v × 20 m = 40 m
Therefore, the speed of the water in the river is:
v = 40 m / 20 m = 2 m/s.
d) The speed of the boat as seen by a fish drifting with the river is the difference between the speed of the boat and the speed of the water in the river:
Boat speed - Water speed = 2 m/s - 2 m/s = 0 m/s.
So, the speed of the boat as seen by a fish drifting with the river is zero.
e) The boat should head in a direction that makes its velocity vector point directly from A to B. Since A and B are directly opposite each other, this means the velocity vector should be perpendicular to the line connecting A and B.
We know the boat's velocity vector has a magnitude of 2 m/s and is at right angles to the velocity vector of the water in the river, which has a magnitude of 2 m/s. So, we can draw a vector diagram with the velocity vector of the boat pointing straight up and the velocity vector of the water pointing straight to the right. The vector connecting the tail of the water velocity vector to the head of the boat velocity vector will then point directly from A to B.
The angle between the boat's velocity vector and the line connecting A and B can be found using trigonometry. Let θ be this angle. Then:
tan(θ) = (boat speed) / (water speed) = 2 m/s / 2 m/s = 1.
Taking the inverse tangent of both sides gives:
θ = tan^(-1)(1) = 45°.
So, the boat should head in a direction 45 degrees to the right of straight up, or northeast.
Related Questions
What type of wave does not need matter to carry energy?If y varies directly as x and y = 20 when x = 6, what is the value of y when x = 24?
a.
36
b.
80
c.
30
d.
4
Please select the best answer from the choices provided
A
B
C
D
Answers
As for the second question, we can use the direct variation formula:
y = kx
where k is the constant of variation. We can solve for k by plugging in the given values:
20 = k(6)
k = 20/6
Now that we know k, we can use it to solve for y when x = 24:
y = (20/6)(24) = 80
Therefore, the value of y when x = 24 is 80, which is option B.
*Question*
I am a thing, when you get hold of me I will be with you while while am in my natural environment. But when you take me from my environment I will leave you after a while. What am I ?
Answers
Answer:
A breath
Explanation:
When you are in your natural environment, you naturally breathe in the air around you. But if you were to take a breath of air and hold it in your lungs, eventually you would have to exhale and the breath would leave you. Similarly, if you were to be taken out of your natural environment (such as being underwater or in space), you would not be able to breathe and would eventually die without a source of oxygen.
Question #1 A cabinet initially at rest on a horizontal surface requires a 115 N horizontal force to set it in motion. If the coefficient of static friction
between the cabinet and the floor is 0.38,what is the normal force exerted on the cabinet? What is the mass of the cabinet?
Step #4 Show all your work with units.
Step # 1. Draw a free body diagram with arrows and given
and known valuer
Answers
The Normal force = 302.63 N
How to solveFriction Force = 115 N
u*Normal force= friction,
u= 0.38,
N= 115/0.38
Therefore, the Normal force = 302.63 N
Mass is a fundamental feature of matter that quantifies the amount meaningful in an object. It is typically calculated in units of kilograms (kg) or grams (g). Mass is various from weight, that depends on the gravitational force pursuing an object, while mass debris constant although gravity.
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if no action is taken to address the issues evaluate whether the impact of light pollution radio interference and space debris on the field of astronomy is lily to worsen lessen or remain the same during the next 50 years
Answers
If no action is taken to address the issues evaluate whether the impact of light pollution radio interference and space debris on the field of astronomy is then a. likely to worsen
Astronomers already have a serious problem with light pollution from cities and other sources, which makes it more challenging to detect dim objects in the night sky. Light pollution is predicted to get worse unless action is taken to stop it as urbanisation grows and more artificial lights are installed.
Astronomical observations can be affected by radio interference from telecommunications, and unless steps are taken to reduce the issue, the issue is only going to become worse as the number of radio-emitting devices rises. In addition, astronomers' instruments and spacecraft are increasingly in danger from space debris. The probability of collisions and other accidents is anticipated to rise as the amount of trash in space continues to rise.
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Complete Question:
If no action is taken to address the issues evaluate whether the impact of light pollution radio interference and space debris on the field of astronomy is then -
a. likely to worsen
b. lessen or remain the same during the next 50 years
Cs-124 has a half-life of 30.8 s
A) If we have 7.5 μg initially, how many Cs nuclei are present?
B) How many nuclei are present 2.6 min later?
Answers
A) There are 3.70 x 10¹⁶ Cs nuclei present initially and B) There are 2.27 x 10¹⁵ Cs nuclei present 2.6 min later.
A) To solve this problem, we can use the following equation,
[tex]N = N'2^{\frac{-t}{T_{1/2}}}[/tex]), number of Cs nuclei present is N, initial number of Cs nuclei present is N', elapsed time is t, half-life of Cs-124 is T½. First, we need to convert the initial mass of Cs-124 to the number of nuclei present,
7.5 μg Cs-124(1g/10⁶μg)(6.022x10²³nuclei/1g)
= 4.52 x 10¹⁵ Cs-124 nuclei.
Using the equation above, we can find the number of Cs-124 nuclei present after 0 s,
[tex]N = 4.52 * 10^{15} * 2^{\frac{-0}{30.8}}}[/tex]
= 4.52 x 10¹⁵ Cs-124 nuclei
Therefore, initially, there are 4.52 x 10¹⁵ Cs-124 nuclei present.
B) After 2.6 min (156 s), we can again use the same radioactivity equation to find the number of Cs-124 nuclei present,
[tex]N = 4.52 * 10^{15} * 2^{\frac{-156}{30.8}}}[/tex]
N = 1.60 x 10¹⁴ Cs-124 nuclei
Therefore, 2.6 min later, there are 1.60 x 10¹⁴ Cs-124 nuclei present.
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8. Molecular gastronomy was created by two scientists from Oxford University.
True or false
Answers
True,
molecular gastronomy was created by two scientists from Oxford University. Molecular gastronomy is a sub-discipline of food science that investigates the physical and chemical transformations of ingredients during cooking. It was first established by physicist Nicholas Kurti and chemist Hervé This, both from Oxford University. The term "molecular gastronomy" was coined in 1988 during a workshop on the science of cooking, which aimed to bridge the gap between scientific research and culinary arts.
Molecular gastronomy explores various aspects of food, such as flavor, texture, and presentation, and combines scientific knowledge with culinary techniques. This innovative approach to cooking has led to the creation of many unique and modern dishes, often featuring unexpected combinations of ingredients and visually appealing presentations.
The objective of molecular gastronomy is not only to create innovative dishes but also to understand and improve traditional cooking methods. This has led to advancements in food technology, as well as a deeper understanding of the science behind cooking processes. As a result, molecular gastronomy has become a popular and influential trend in the culinary world, inspiring chefs and home cooks alike to experiment with new techniques and ingredients.
In summary, molecular gastronomy was created by two scientists from Oxford University, Nicholas Kurti and Hervé This. Their groundbreaking work has had a significant impact on the culinary world and has led to many exciting innovations in food preparation and presentation.
1. How many heating degree days would you expect annually in Indanapolis in 2050?
2.. What would the R value for the wall be if we replaced the fiberglass with polyurethane? Note: 6" of fiberglass has an R value of 19 while 6" of polyurethane would have an R value of 37.8
3. The wall of a house is 33 feet long x 14 ft high and is painted white. The wall is at a temperature of 60 F. How much power, in Watts, is radiated by the wall.
Hint - make sure to convert to the correct metric units: meters and Kelvin.
4. A house has a volume of 23,643 cubic feet and has 0.55 air exchanges per hour. If the outside temperature is 22 and the inside temperature is 72 how much heat is lost through infiltration, in BTU/hr?
Answers
1. Around 5000-5500 heating degree days would be expected annually in Indianapolis in 2050.
2. If we replaced the fiberglass with polyurethane, the R value for the wall would be 37.8.
3. The power radiated by the wall is approximately 388 watts.
4. The heat lost through infiltration is approximately 15,785 BTU/hr.
1. The number of heating degree days (HDD) is a measure of how much heating is needed to maintain indoor comfort. It is calculated by subtracting the average daily temperature from a reference temperature of 65 degrees Fahrenheit (18 degrees Celsius). Climate change models predict that temperatures will continue to rise, leading to fewer heating degree days. According to a study by the Union of Concerned Scientists, Indianapolis is projected to experience around 5000-5500 heating degree days annually by 2050.
2. The R value is a measure of the thermal resistance of a material. It indicates how well a material resists heat flow, with higher R values indicating better insulation. Fiberglass insulation has an R value of 19 per 6 inches, while polyurethane insulation has an R value of 37.8 per 6 inches. By replacing the fiberglass insulation with polyurethane, the R value of the wall would increase from 19 to 37.8.
3. The power radiated by an object can be calculated using the Stefan-Boltzmann law, which relates the temperature of an object to the amount of radiation it emits. In this case, we can assume that the wall behaves as a blackbody and use the formula P = σA(T^4), where σ is the Stefan-Boltzmann constant, A is the surface area of the wall, and T is the absolute temperature of the wall in Kelvin. Converting the dimensions of the wall to meters and the temperature to Kelvin, we can calculate that the power radiated by the wall is approximately 388 watts.
4. Infiltration is the uncontrolled exchange of air between the indoors and outdoors. It is often the largest source of heat loss in a building. The amount of heat lost through infiltration can be calculated using the formula Q = V x ΔT x ACH x 60, where Q is the heat loss in BTU/hr, V is the volume of the building in cubic feet, ΔT is the temperature difference between indoors and outdoors in degrees Fahrenheit, ACH is the air changes per hour, and 60 is a conversion factor. Plugging in the given values, we can calculate that the heat lost through infiltration is approximately 15,785 BTU/hr.
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state ohmic conductor
Answers
Answer:
An ohmic conductor is defined as one which obeys ohm's law that is V ∝ I where is the voltage and is the current. There must be a linear graph. Silver is an example of an ohmic conductor as the graph for silver is a linear graph. Silver and copper are some examples of ohmic conductor
is woodburning heater a endothermic or exothermic process
Answers
Answer:
Wood burning in a wood-burning heater is an exothermic process.
Explanation:
An exothermic process releases energy in the form of heat, and in the case of wood burning, the combustion of wood releases heat in the form of flames and hot gases.
When wood is burned in a wood-burning heater, the carbon-based molecules in the wood are oxidized by oxygen in the air, producing carbon dioxide and water vapor, as well as heat and light energy.
Hence, the process of wood burning in a wood-burning heater is an exothermic process that releases heat energy to the surrounding environment.
Name the type of component through which current only flows in one direction.
Answers
A cart with mass m subscript 1 equals 0.25 space k g is at rest on a track. A second cart of mass m subscript 2 equals 0.35 space k g is pushed down the track and collides with it. The carts stick together after the collision. The second cart's speed immediately before the collision is v subscript 02 equals 6.17 space m divided by s. The overall magnitude of the carts' common final velocity is _______________ (enter the numerical value only, in m/s).
Answers
After considering the given data and information we come to the conclusion that overall magnitude of the carts' common final velocity is 3.6 m/s, under the condition that a cart with mass m subscript 1 equals 0.25 space k g is at rest on a track.
Then, we can apply the law of conservation of momentum to evaluate the common final velocity of the carts.
The law of conservation of momentum projects that the total momentum of an isolated system stays constant if no external forces act on it. For this required case, the system is the two carts.
Before the collision, the first cart is in the rest and the second cart has a velocity of 6.17 m/s. Hence, the total momentum of the system before the collision is
p = m₁v₁ + m₂v₂
Here,
m1 and m2 are the masses of the carts and `v1` and `v2` are their velocities.
Staging the given values,
p = (0.25 kg)(0 m/s) + (0.35 kg)(6.17 m/s)
Applying simplification this expression
p = 2.16 kgm/s
Post the event of collision, the two carts stick along each other and move with a common final velocity `v`. The total momentum of the system after the collision is
p = (m₁ + m₂)v
Staging the given values, and evaluate for v
v = p / (m₁ + m₂)
Staging the given values
v = (2.16 kgm/s) / (0.25 kg + 0.35 kg)
v = 2.16/0.6
Applying simplification this expression
v ≈ 3.6 m/s
Then, the overall magnitude of the carts' common final velocity is approximately 3.6 m/s.
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PLS HELP
See how a block and tackle system can increase your mechanical advantage. You will need two broomsticks, a rope, and two helpers.
A. Give each helper a broom stick and have them stand facing each other holding the broomstick firmly in both hands in a horizontal position. The broomsticks should be at the same level, about two feet apart.
B. Tie one end of the rope to one of the broomsticks. (You may need to have one of your helpers hold the knot firmly in one hand as he or she holds the broomstick to help anchor it.)
C. Wrap the rope around the other broomstick, as in a simple pulley system, and pull on the free end of the rope. Your helpers should resist your pulling. What happens? Can you pull the broomsticks together?
D. Now weave the rope back over the first broomstick, so you have a double pulley. Pull on the free end. What happens now? Can you pull the broomsticks together? What is your mechanical advantage?
E. Try weaving the rope over the broomsticks one or two more times. Describe what happens, and state the mechanical advantage of each situation.
F. Write a summary of what happened and an explanation using the terms: force, distance, work, mechanical advantage
Answers
The block and tackle system is a way to increase mechanical advantage by using a combination of pulleys and ropes. In this experiment, two broomsticks are used to create a simple pulley system. By tying one end of a rope to one broomstick and wrapping it around the other, a mechanical advantage can be achieved.
In the first step, the rope is tied to one broomstick and wrapped around the other. Pulling on the free end of the rope, the helpers resist your pulling, and the broomsticks don't move closer together.
In the next step, the rope is woven back over the first broomstick, creating a double pulley. Pulling on the free end of the rope, the helpers again resist your pulling, but the broomsticks move closer together. This is because the double pulley increases the mechanical advantage, allowing you to lift a heavier load with less force.
By weaving the rope over the broomsticks one or two more times, the mechanical advantage increases even further. With each additional pulley, the amount of force required to lift the load decreases.
Therefore, the block and tackle system increases mechanical advantage by using a combination of pulleys and ropes. By increasing the number of pulleys, the force required to lift a load decreases. This is achieved by spreading the force over a greater distance, allowing for the same amount of work to be done with less force.
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5. Grade 10 learners are given the pieces of experts listed below Sem beaker 50 cm' measuring cylinder Tape measure Electron beamer meter ruter Clock spring balewer Voltmeter 25cm pipette 4) Complete the table below by inserting the name of one piece of apparatus from the list the most suitable for measuring each quantity described Quantity to be measured Most suitable apparatus 25 cm' of water A distance of about 50 m The mass of coin The force required to lift a school book An athlete's duration Step watch
Answers
Measurement is the process of assigning a numerical value to a physical quantity or property of an object or phenomenon. In this the quantity being measured is compared to a reference quantity and then the result is expressed as a numerical number in the appropriate units.
Quantity to be measured Most suitable apparatus
25 cm³ of water Measuring cylinder
A distance of about 50 m Tape measure
The mass of coin Balance
The force required to lift a school book Spring balance
An athlete's duration Stopwatch
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Your question is incomplete, most probably the complete question is:
5. Grade 10 learners are given the pieces of experts listed below:
Sem beaker 50 cm' measuring cylinder Tape measure Electron beamer meter ruter Clock spring balewer Voltmeter 25cm pipette4) Complete the table below by inserting the name of one piece of apparatus from the list the most suitable for measuring each quantity described:
25 cm' of water A distance of about 50 m The mass of coin The force required to lift a school book An athlete's duration Step watchA ball falls straight down through the air under the influence of gravity. There is an opposing force F~ on the ball with magnitude given by F = b v, where v is the speed of the ball and b is a positive constant. What is the magnitude of the acceleration of the ball at any time?
Answers
Answer:
Explanation:
The net force acting on the ball is given by:
F_net = F_gravity - F_air
where F_gravity is the force due to gravity acting downwards and F_air is the force due to air resistance acting upwards.
F_gravity = m g, where m is the mass of the ball and g is the acceleration due to gravity.
F_air = b v, where b is a positive constant and v is the speed of the ball.
The acceleration of the ball is given by:
a = F_net / m
Substituting the expressions for F_gravity and F_air, we get:
a = (m g - b v) / m
Simplifying, we get:
a = g - (b/m) v
Therefore, the acceleration of the ball at any time is given by g - (b/m) v, where g is the acceleration due to gravity, b is a positive constant representing the air resistance force, m is the mass of the ball, and v is the speed of the ball. As the ball falls faster, the air resistance force increases, causing the acceleration to decrease.
** State the reason why heat transfer by radiation is faster than heat transfer by conduction
Answers
Heat transfer by radiation is faster than heat transfer by conduction because radiation can occur through a vacuum, while conduction requires the presence of a medium, such as a solid, liquid, or gas. Radiation is the transfer of energy through electromagnetic waves and does not require any medium to propagate, which means that radiation can occur even in a vacuum or through transparent materials.
On the other hand, conduction requires particles to transfer heat energy from one object to another. In a solid, this occurs through the transfer of kinetic energy from one molecule to another through direct contact, while in a liquid or gas, conduction occurs through collisions between molecules. This process of molecule-to-molecule transfer of heat energy is much slower than radiation and is limited by the physical properties of the medium, such as its thermal conductivity.
Therefore, heat transfer by radiation is faster than heat transfer by conduction because radiation can occur through a vacuum, and is not limited by the physical properties of a medium, while conduction is limited by the thermal conductivity of the medium and requires direct contact between molecules.
PLEASE HELP ME I BADLY NEED THIS RN I'LL MARK AS BRAINL!EST WHOEVER ANSWER THIS RIGHT!!
Answers
1. To find the distance covered by the bus in 5 hours, we can use the formula:
distance = speed x time
Here, the speed of the bus is given as 50 km/hr, and the time taken is 5 hours. Substituting these values into the formula, we get:
distance = 50 km/hr x 5 hr
distance = 250 km
Therefore, the bus covers a distance of 250 km in 5 hours at an average speed of 50 km/hr.
2. To find the distance covered by the car in 6 hours, we can use the formula:
distance = speed x time
Here, the speed of the car is given as 50 km/hr, and the time taken is 6 hours. Substituting these values into the formula, we get:
distance = 50 km/hr x 6 hr
distance = 300 km
Therefore, the car covers a distance of 300 km in 6 hours at an average speed of 50 km/hr.
3. To find the time taken by the tricycle to cover a distance of 10 km at an average speed of 5 km/hr, we can use the formula:
time = distance / speed
Substituting the given values, we get:
time = 10 km / 5 km/hr
time = 2 hours
Therefore, it will take the tricycle 2 hours to cover a distance of 10 km at an average speed of 5 km/hr.
a what are the factors that causes change in the motion of jeep?
b, How can a man change the friction speed of the jeep?
Answers
Changes in the terrain or road conditions, changes in the speed of the jeep, and external forces cause a change in motion of the jeep and a man changes the friction speed of the jeep by adjusting the amount of force applied to the brakes and the gas pedals and external factors.
a) There are several factors that can cause a change in the motion of a jeep. Firstly, changes in the terrain or road conditions such as an incline, rough surface, or gravel can affect the motion of the jeep. Secondly, changes in the speed of the jeep can also cause a change in motion, such as acceleration or deceleration. Additionally, external forces such as wind or other vehicles on the road can also impact the motion of the jeep.
b) The friction speed of a jeep can be changed by adjusting the amount of force applied to the brakes and the gas pedals. The brakes slow down the jeep by creating friction between the brake pads and the wheels, while the gas pedal increases speed by providing more power to the engine.
A driver can also change the friction speed by shifting gears or adjusting the clutch. Additionally, external factors such as the weight of the load in the jeep or the type of tires used can also affect the friction speed. It is important to note that changes in friction speed should be done safely and within the legal speed limits on the road.
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Question 2 of 10
What happens to the resistance of a wire as its length increases?
A. The resistance is not affected by a change in wire length.
B. The resistance decreases.
C. The resistance alternates between high and low values.
D. The resistance increases.
Answers
Answer:
D. resistance increases
Explanation:
The relationship between resistance and wire length is directly proportional, meaning the longer the wire the greater the resistance.
Answer: The resistance increases.
Explanation: A wire's resistance is directly proportional to its length. This implies that as a wire's length increases, so does its resistance. The following formula describes this relationship:
R = ρ (L/A)
where L is the wire's length, A is its cross-sectional area, R is the wire's resistance, and ρ is the wire material's resistivity.
This formula shows that the resistance will rise when the wire's length is extended while its cross-sectional area remains the same. On the other hand, if we shorten the wire, the resistance will rise. As a result, choice D is the right response.
Orange light with a wavelength of 5.89 E−7 m is used in Young's experiment with the slits separated by a distance of 1.20 E−4 m. The screen is located at a distance from the slits of 4.07 m. Calculate the distance on the screen between the central bright fringe and the first bright fringe. Show all work for full credit.
Answers
The distance on the screen between the central bright fringe and the first bright fringe is 0.0199 meters.
Young's double-slit experiment is a classic experiment that demonstrates the wave nature of light. It involves shining light through two closely spaced slits and observing the interference pattern on a screen.
In Young's double-slit experiment, the distance between the central bright fringe and the first bright fringe can be calculated using the equation:
y = (mλD) / d
where:
y = distance between fringes
m = order of the fringe (m=1 for first bright fringe)
λ = wavelength of light
D = distance from the slits to the screen
d = distance between the slits
Plugging in the given values, we get:
y = (1 * 5.89 E-7 m * 4.07 m) / 1.20 E-4 m
y = 1.99 E-2 m or 0.0199 m
Therefore, the distance on the screen between the central bright fringe and the first bright fringe is approximately 0.0199 meters.
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When traveling around playgrounds, parks or school, drivers should
exercise extreme caution and reduce speed.
a) true
b) false
Answers
Explanation:
A) True.
Drivers should exercise extreme caution and reduce speed when traveling around playgrounds, parks, or schools as these areas are usually frequented by children, who may not always be aware of traffic rules and may suddenly enter the road. By reducing the speed, drivers will have better control of their vehicles and be able to react quickly to any unexpected situations. Therefore, it is important to exercise caution and reduce speed while driving around such areas.
A puffin flies through a fjord with 24 J of KE. If she doubles her speed, what will be her new KE (in J)?
Answers
A puffin flies through a fjord with 24 J of KE. If she doubles her speed, the new KE of the puffin will be 96 J.
Assuming the mass of the puffin remains constant, KE of puffin can be calculated as:
KE = [tex](1/2)mv^2[/tex]
where m = mass of the puffin, and v = initial velocity of the puffin
Let's assume that the initial velocity of the puffin is v and its KE is 24 J. Therefore,
24 = [tex](1/2)mv^2[/tex]
Solving for v, we get:
v = [tex]\sqrt{((2*24)/m)[/tex]
Now, if the puffin doubles its speed, new velocity will be 2v. Therefore, the new KE can be calculated as:
KE_new = ([tex]1/2)m(2v)^2 = 4(1/2)mv^2[/tex]= 4(24) = 96 J
Therefore the new KE of the puffin will be 96 J if it doubles its speed.
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Read Computer about essay and Semiconductors calculators present your about page.
Answers
Semiconductors are a fundamental component of up-to-date electronics. They are matters that can conduct electricity under certain environments, but not under others, making the ruling class extremely adjustable.
What is silicon and how is it a semiconductor?Silicon is the most widely used semiconductor material, but different materials in the way that germanium and gallium arsenide are also secondhand in specific uses.
By doping the semiconductor material with particular impurities, it is attainable to create either beneficial or negative charges, allowing for the creation of diodes, transistors, and additional electronic components. These parts have revolutionized the habit we live, from the smartphones we carry in our pockets to the computers we use continually.
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Describe what role resonance could have played in the bridge’s oscillations. Look up the London Millennium Bridge. What role did resonance play in that near-disaster?
Answers
During the London Millennium Bridge incident, resonance played a critical role in the near-disaster. The bridge was designed to have a low level of damping, making it highly susceptible to resonant vibrations. When the bridge was open to the public, it was subjected to pedestrian-induced forces that caused it to sway back and forth. As the pedestrians walked across the bridge, they caused small lateral oscillations that were amplified by the natural frequency of the bridge. As a result, the bridge began to sway more and more dramatically, leading to a dangerous situation where people could have been injured or even killed.
To address the problem, engineers added a series of dampers to the bridge, which helped to reduce the amplitude of the oscillations and stabilize the structure. The dampers essentially absorbed the energy of the oscillations, preventing them from building up and causing the bridge to oscillate at its natural frequency. Overall, the incident demonstrated the critical importance of understanding resonance in structural design and the potential dangers of failing to account for it.
What is the mass (in kg) of a Puffin flying 10 m/s with 1000 J of KE?
Answers
Answer:
20 kg
Explanation:
The kinetic energy (KE) of an object is given by:
KE = (1/2) * m * v^2
Where m is the mass of the object, and v is its velocity.
We can rearrange this formula to solve for the mass:
m = 2 * KE / v^2
Plugging in the values given:
m = 2 * 1000 J / (10 m/s)^2
m = 20 kg
Therefore, the mass of the Puffin flying at 10 m/s with 1000 J of KE is 20 kg.
PLS HELP
See how a block and tackle system can increase your mechanical advantage. You will need two broomsticks, a rope, and two helpers.
A. Give each helper a broom stick and have them stand facing each other holding the broomstick firmly in both hands in a horizontal position. The broomsticks should be at the same level, about two feet apart.
B. Tie one end of the rope to one of the broomsticks. (You may need to have one of your helpers hold the knot firmly in one hand as he or she holds the broomstick to help anchor it.)
C. Wrap the rope around the other broomstick, as in a simple pulley system, and pull on the free end of the rope. Your helpers should resist your pulling. What happens? Can you pull the broomsticks together?
D. Now weave the rope back over the first broomstick, so you have a double pulley. Pull on the free end. What happens now? Can you pull the broomsticks together? What is your mechanical advantage?
E. Try weaving the rope over the broomsticks one or two more times. Describe what happens, and state the mechanical advantage of each situation.
F. Write a summary of what happened and an explanation using the terms: force, distance, work, mechanical advantage
Answers
Answer:
Explanation:
In this experiment, a block and tackle system was created using two broomsticks, a rope, and two helpers. The rope was tied to one broomstick and wrapped around the other, creating a simple pulley system. When the free end of the rope was pulled, the helpers resisted and the broomsticks did not move.
Next, the rope was woven back over the first broomstick, creating a double pulley. Pulling on the free end of the rope resulted in the broomsticks moving closer together. This demonstrated the mechanical advantage of the block and tackle system.
By adding more loops of rope over the broomsticks, the mechanical advantage was increased further. The force applied to the rope was spread out over a greater distance, resulting in less force required to move the broomsticks.
In summary, the block and tackle system increases mechanical advantage by spreading out the force applied over a greater distance. This is achieved through the use of pulleys and loops of rope, allowing a smaller force to move a larger load.
This is for physics, question in pics brainliest!!!
Answers
Answer:
Construct a parallelogram ABCD with BD= 104mm, DC= 48mm and angle DBC= 30. Measure AC
During the 28-day lunar cycle, the positions of the Sun,
Earth, and the Moon change in relation to one another. The
diagram shows how their relative positions change.
Which statement describes the positions of the Moon, the Sun, and Earth
during a new moon?
A. Earth is closer to the Sun than to the Moon.
B. The Moon is between Earth and the Sun.
C. Earth is between the Moon and the Sun.
D. The Sun is between Earth and the Moon.
Answers
Answer: B
Explanation: B is the correct statement describing the positions of the Moon, the Sun, and the Earth during a new moon. The Moon is between Earth and the Sun.
During a new moon, the Moon is positioned between the Sun and the Earth, with the illuminated side of the Moon facing away from the Earth. This means that the side of the Moon that faces the Earth is not receiving any sunlight, making it invisible to us from Earth. The new moon is the first phase of the lunar cycle and occurs roughly every 29.5 days.
Please someone help me :)Choose a scientist from the timeline on the previous page. Conduct research using outside sources. Be sure to choose reliable resources such as government, scientific, and educational websites. Document all research in your own words. Be sure to properly site all resources used in your assignment.
scientists are
- Democritus
-John Dalton of England
-J.J. Thomson
- Ernest Rutherford
-Niels Bohr
-Erwin Schrödinger of Austria
-James Chadwick
Research and respond to the following:
Were there experiences in his life that led to his interest in science and the study of the atom?
Defend his work on the atom and its contribution to the modern atomic model.
Point out which contributions are present in the modern atomic model and which were eventually disproven and thus are not part of the modern mode
Answers
Ernest Rutherford's discovery of the nucleus and his work on isotopes and radioactivity laid the foundation for the development of the modern atomic model, which includes electrons in shells around a nucleus composed of protons and neutrons. Although his model was modified by Niels Bohr, his contributions significantly impacted the field of atomic and nuclear physics and continue to influence our understanding of the atom and the fundamental forces of the universe.
Ernest Rutherford, a New Zealand physicist, is considered one of the most influential scientists in the field of atomic and nuclear physics. Rutherford was born on August 30, 1871, in Brightwater, New Zealand. His family was of Scottish descent and moved to New Zealand in 1842.
Rutherford's early interests were in mathematics and science, and he earned a scholarship to study at Canterbury College in Christchurch, New Zealand. After earning his Bachelor's degree, he went on to study at the University of Cambridge in England, where he worked with J.J. Thomson and earned a Ph.D. in physics.
Rutherford's interest in science and the study of the atom was driven by his curiosity about the structure of matter. He conducted experiments in which he fired alpha particles at a thin sheet of gold foil and observed that some of the particles were deflected at large angles, while others passed straight through. This led him to propose the nuclear model of the atom, which suggests that the atom is mostly empty space with a small, dense, positively charged nucleus at its center.
Rutherford's work on the atom and the nuclear model contributed significantly to the development of the modern atomic model. His discovery of the nucleus led to the development of the proton and neutron, which are present in the modern atomic model. He also contributed to the understanding of isotopes and radioactivity, which led to the development of nuclear energy and the atomic bomb.
However, Rutherford's model was later modified by Niels Bohr's model, which introduced the concept of electron shells and quantized energy levels. This led to the development of the modern atomic model, which includes electrons in shells around a nucleus composed of protons and neutrons.
Therefore, Rutherford's curiosity and his contributions to the nuclear model of the atom significantly impacted the field of atomic and nuclear physics. His discovery of the nucleus, along with his work on isotopes and radioactivity, laid the foundation for the development of the modern atomic model, which includes electrons in shells around a nucleus composed of protons and neutrons. Although his model was later modified, his work continues to influence our understanding of the atom and the fundamental forces of the universe.
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An apple with a mass of 5 kg hangs on a tree 12 m
above the ground. What is the gravitational potential
energy of the apple?
Answers
Answer: d) 5.88
Explanation:
Q5. Which of the following is NOT true about gravity?
A). The more massive two objects are, the greater the
gravitational force between them.
.B). Gravitational force between two objects depends
only on the mass of the larger object.
.C). Gravitational force between two objects depends on
the distance between them.
.D). People can jump higher on the moon than on Earth
because the gravitational force between a person and
the moon is lower than the gravitational force between
a person and the Earth.
.E). A gravitational force exists between the moon and
the sun.
Answers
C. Gravitational force between two objects depends
only on the mass of the larger object is NOT true about gravity
What is Gravitational force?Gravity is a fundamental interaction that causes all entities with mass or energy to attract one other.
In nature, there are no other sorts of gravity. This indicates that based on their masses and the distance between their centers, there is only one form of gravitational force pulling the two bodies together.
Gravity is the weakest force known in nature and is a form of central force.
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