Answer:
20n
Explanation:
20 n
Find the x and y-components of the vector vector a =(15 m/s^ 2, 39 left of -y axis)
The x and y components of the vector a = 15 m/s^2 and 39 left of y axis are -14.4, 3.99 m/s^2.
What is a vector and how it is calculated out to be so?In science we need a method to define both direction and magnitude, vector is one such method.In this question is given vector a = 15 m/s^2 , and is 39 left to the y axis , for calculating x and y component.To calculate the x component , = -asin39 degree = -15 x 0.96 = -14.4 m/s^2.To calculate the y component of the vector , = -a cos39 degree= -15 x 0.266 = -3.99 m/s^2.So the x and y component of the vector are -14.4 m/s^2 and 3.99 m/s^2 respectively.To know more about vector visit:
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An airship moving north at 55.0 km/h with respect to the air encounters a wind from 17.0° north of west. If the wind’s speed with respect to Earth is 40.0 km/h, what is the airship’s velocity with respect to Earth?
The airship’s velocity with respect to Earth is -60.1° west of north.
Velocity is the speed at which something moves in a particular direction.
Vaw = 55.0 km/h, north
Vwe = 40.0 km/h at 17.0°
north of west,
Vae = Vaw + Vwe
Vx, ae = Vx, aw + Vx, we = Vwe (cos θwe)
Vy, ae = Vy, aw + Vy, we = Vaw + Vwe(sin θwe)
θwe = 180.0° − 17.0° = 163.0°
Vx, ae = (40.0 km/h)(cos 163.0°) = −38.3 km/h
Vy, ae = 55.0 km/h + (40.0 km/h)(sin 163.0°) = 55.0 km/h + 11.7 km/h
= 66.7 km/h
Vae = √(Vx, ae)²+(Vy, ae0)²
= √(−38.3km/h)²+(66.7km/h)²
= √ 1. 47×10³ + 4.45×10³
= 5. 92×10³km²/h²
= 76.9 Km/ hr.
θ = tan⁻¹ ( Vy,ae / Vx, ae)
θ = tan⁻¹ ( 66.7 / -38.3 )
θ = −60.1° west of north
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A can of bean rolls off a horizontal table with a velocity of 0.44 m/s. If the table is 0.95 meters high, how long did it take the can to hit the floor.
11.An object has a gravitational potential energy of 220 J after being
lifted a height of 8m on Earth. What is the mass of the object?
a 5.23 kg
b 1.67 kg
C 3.73 kg
d 2.81 kg
Object has a gravitational potential energy= 220J and height =8m, then the
mass of the object = 2.81kg
Energy acquired by an object due to the change in its position when it is present in a gravitational field is called gravitational potential energy. It can be also be said that gravitational potential energy is an energy that is related to gravity. Gravitational potential energy is stored in gravity batteries by lifting a mass to some particular height using a pump or motor. After the mass is lifted, it then stores gravitational potential energy depending on the mass of the object and also the height.
As given gravitational potential energy = 220 J
height = 8m
As we know that,
potential energy= mass* gravity* height
Therefore,
mass= potential energy/( gravity * height)
=220/(9.8 * 8)
mass = 2.81 Kg
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Determine the final speed of a proton that has an initial speed of 264 m/s and is then uniformly accelerated
in an electric field at the rate of -16 m/s² for 15 s.
A proton, a subatomic particle, is found in the nucleus of every atom. The electrical charge of the particle is positive and the opposite of the electron's. If a proton were isolated, it would weigh only 1.673 x 10-27 kilos, little less than a neutron.
We will alter our speed when we are already travelling and want to go faster or slower. This roughly sums up what acceleration is. However, acceleration is not merely a matter of changing speed. Acceleration actually refers to the change in speed per unit of time. So let's imagine we want to increase or decrease our speed at a set rate. Our acceleration will be greater the faster we move.
An electric field is a physical field that surrounds electrically charged particles and acts as an attractor or repellent to all other charged particles in the vicinity. It can also refer to the physical field surrounding a system of charged particles.
Using,
a = (Vf - Vi) / t
-16 m/s² = (Vf - 264) / 15
(-16 * 15)+264 = Vf
Vf = 24 m/s
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A student uses a spring-loaded launcher to launch a marble vertically in the air. The mass of the marble is 0.003 kg and the spring constant is 220 N/m. What is the maximum height the marble can reach when compressed by 2 cm?
Maximum heigh: 1.496 m
(This number is not exacte I truncated it)
Explanation:
Data:
mass : m = 0.003 kg
spring constant : k = 220 N/m
amount of compression: x = 2 cm = 0.02 m
heigh : h = ?
accelaratiom due to gravity : g = 9.8ms^-2
Potential Energy : PE = ?
Since you'll be converting the PE to KE, you'll use 2 formulas.
Formulas:
[tex]PE=\frac{1}{2}\cdot k\cdot x^2[/tex][tex]PE_{\text{marble}}\text{ = }m\cdot g\cdot h_{}[/tex]Solution:
[tex]\begin{gathered} PE\text{ }=\text{ }\frac{220\cdot0.02^2}{2} \\ PE\text{ = }0.044\text{ J} \end{gathered}[/tex][tex]\begin{gathered} 0.044\text{ J =}m\cdot g\cdot h \\ 0.044\text{ = 0.003 }\cdot\text{ }9.8\cdot\text{ h} \\ h\text{ = }\frac{0.044}{0.003\cdot\text{ 9.8}} \\ h\text{ }\approx\text{ 1.496 m} \end{gathered}[/tex]how would the accelerations you measured in this lab change if you were still moving the same small masses from one hanger to the other for each trial, but the total mass of the system was much larger? the measured accelerations would all be:
When the total mass of the system much larger then the measured accelerations would all be: halved.
In an Atwood's Machine, weight difference between the two hanging masses determines the net force acting on the system and this accelerates the hanging masses. Heavier mass is accelerated downward whereas the lighter mass is accelerated upward.
The second law states that the acceleration of an object depends on two variables that are: the net force acting on the object and the mass. The acceleration of an object depends directly on the net force acting on the object and inversely upon the mass.
F = m*a
Where, F denotes force, m is mass and a is acceleration. If force is doubled, acceleration also gets doubled whereas if the mass is doubled then acceleration becomes half.
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while getting your reflexes tested at the doctor’s office, your leg moves less and less each time the doctor hits your kneecap with the reflex hammer. what is this an example of?
In getting your reflexes tested at the doctor’s office, your leg moves less and less each time the doctor hits your kneecap with the reflex hammer, this an example of A. observational Learning
What occurs during a knee reaction?The patellar reflex, commonly referred to as the knee reflex, is a straightforward reaction that causes the quadriceps muscle to contract when the patellar tendon is stretched.
Therefore, the process of learning through seeing other people's activities is known as observational learning. The desired behavior is observed, remembered, and imitated. As youngsters mimic the actions of adults, they engage in observational learning, sometimes referred to as shaping and modeling.
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See full question below
While getting your reflexes tested at the doctor’s office, your leg moves less and less each time the doctor hits your kneecap with the reflex hammer. What is this an example of?
A. observational Learning
B. sensitization
C. Habituation
D. Associative Learning
A 969 n sky diver has opened his parachute to slow his descent to a constant speed the parachute applies 1,323 n of force. what deceleration does he experiences
Answer:
See below
Explanation:
Find mass of skydiver
F = mg
969 = m ( 9.81) so m = 98.8 kg
NET deccel force = 1323-969 = 354 N
F=ma
354 = 98.8 (a) = 3.58 m/s^2 decceleration
Suppose we look at a photograph of many galaxies. assuming that all galaxies formed at the same time after the big bang, which galaxy appears to us as the youngest?
The galaxy appears to us as the youngest is the one that is farthest away.
Basically, a galaxy can be characterized as a collection (bunch) of numerous billions of stars, that are existing autonomously or by themselves.One of the foremost imperative characteristics of a universe is that it comprises billions of stars with diverse ages, extending from the most youthful star to the oldest. , a star that's closest to mankind is the most seasoned whereas the one that's most remote absent is the youngest. While we assume that we look at a photograph of many galaxies. assuming that all galaxies formed at the same time after the big bang, So it can be concluded that the star that is the closest to us is the oldest one while the more distant star is the more youthful it is.
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1. Think of an engineering problem where having an object with a high (k) value would be a benefit?
2. Think of an engineering problem where having an object with a low (k) value would be a benefit?
An example of a project where an object with a high (k) value would be a benefit is one that has to do with the design of a rocket engine. Metals that have very high thermal conductivity are useful for building rocket engines. This is because of the amount of energy/heat that is required to be combusted by these parts to achieve a break from the earth's force field of gravity.
While engineering problems where having an object with a low (k) value would be a benefit is those that have to do with buildings. Buildings are made from concrete and brisk with have low thermal conductivity hence low
What does (k) Value mean?A k-value (also known as a k-factor or lambda value) is a measure of a material's thermal conductivity, or how quickly heat moves through it. It is a basic quality that is independent of material quantities.
Thermal conductivities of different building materials may be compared using k-values. This is often useful in determining the possibility of heat transmission between the inside and exterior of a structure.
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A student rolls a ball along the floor so that the ball has a speed of 16m/s. What is the speed of the ball relative to a second student who is running at 6m/s in the same direction that the ball is rolling?
Answer:
on
Explanation:
when someone runs their hand is not really balanced when they wrote something
If a student rolls a ball along the floor so that the ball has a speed of 16 m / s , then the speed of the ball relative to a second student would be 10 m / s if the student is running at 6 m / s in the same direction that the ball is rolling.
What is Velocity?The total displacement covered by any object per unit of time is known as velocity.
If a student rolls a ball across the floor at a speed of 16 meters per second, the ball's speed in relation to a second student would be 10 meters per second if the second student is sprinting at a speed of 6 meters per second in the same direction as the ball is rolling.
Thus, the relative speed of the ball with respect to the student would be 10 m / s.
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A stunt driver needs to drive off the roof of a 20 meter building. He can only reach 4 m/s on the roof. Where should we put the safety pad for him to land on?
if you are traveling at 49.00 miles per hour, what is your speed in feet per second? (1 mile=5280 ft) report your answer with four significant figures.
The converted unit from mile per hour to feet per second is 71.87 ft/s.
We need to know about unit conversion to solve this problem. The unit conversion can be used to convert a unit to another unit. It can be defined as
a = xb
where a is unit a, b is unit b and x is the constant of conversion.
From the question above, we know that
v = 49 miles/hour
1 mile = 5280 ft
By substituting the given parameters, the converted unit is
v = 49 miles/hour
v = 49 x (5280 ft) / (3600 s)
v = 49 x 1.47 ft/s
v = 71.87 ft/s
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the frictional force that holds an object in place is called ______ friction.
Static Friction is the force that holds the object in the place.
Static friction is the type of friction which acts on body and keep them at rest. Static friction opposes the relative motion and keep the object in a place. It acts tangentially to the surface.The friction forces are of two types, kinetic and static. Static keeps the object at rest and kinetic allows the object to move. Friction plays a major role in our day to day life, we can walk properly without sleeping because of friction only. Due to friction we can slide heavy objects easily on the floor. There are liquids and surfaces which increase or decrease friction according to our needs and are used by factories and companies to make their work easy. To know more about friction visit
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In empty space, which quantity is always larger for x-ray radiation than for a radio wave?.
In empty space, the quantity is always larger for x-ray radiation than for a radio wave is frequency.
How does X-ray radiation work?X-rays are an electromagnetic radiation type that resembles visible light. However, x-rays have a higher energy than light and can penetrate most solid materials, including the human body. Images of the tissues and structures inside the body are created using medical x-rays.
The radiation you receive during an X-ray typically equals between a few days and a few years of exposure to naturally occurring radiation from the environment. The danger of developing cancer many years or decades after being exposed to X-rays exists, but it is regarded to be very low.
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The terrestrial planets are different from the giant planets because when they formed
a. The inner solar system was richer in heavy elements
b. The inner solar system was hotter than the outer solar system
c. The outer solar system took up a bigger volume, so there was more material to form planets
d. The inner solar system was moving faster, so centrifugal force was more important
Option B- the inner solar system was hotter than the outer solar system is the correct answer.
The Sun and the planets formed together 4.6 billion years ago from a cloud of dust particles and gas known as the Big bang. The universe continued to decrease in density and temperature. The energy of each particle was going down.
The terrestrial planets formed near the Sun, where temperatures were best for rocks and metals to condense. The jovian planets formed outside is called the frost line, where temperatures were low for ice condensation.
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A circuit calls for a 0.600 mm -diameter copper wire to be stretched between two points. you don't have any copper wire, but you do have aluminum wire in a wide variety of diameters.
The diameter of the required aluminum wire in place of copper wire is 0.772 mm.
We know, the resistance of the wire is given by,
R = pL/A
Where,
R is resistance,
p is the resistivity of the material,
L so the length of the wire,
A is the area of the wire.
The resistivity p₁ of copper is 1.6 x 10⁻⁸Ω.
The resistivity p₂ of copper is 2.65 x 10⁻⁸Ω.
The length of both the copper as well as the aluminum wire is L.
Let us say the area of copper wire is A₁ and that of aluminum is A₂.
So, for same resistance,
p₁L/A₁ = p₂L/A₂
p₁/A₁ = p₂/A₂
Area = πD²/4
So, we can write,
p₁/D₁² = p₂/D₂²
Putting the values,
1.6 x 10⁻⁸/(0.6)² = 2.65 x 10⁻⁸/D²
D₂ = 0.772 mm.
The diameter of the aluminum wire required is 0.772mm.
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Complete Question - A circuit calls for a 0.500 mm-diameter copper wire to be stretched between two points. You don't have any copper wire, but you do have aluminum wire in a wide variety of diameters.
a) What diameter aluminum wire will provide the same resistance?
If the Earth actually had two moons as observed in the image, which of the following would be observed?
time would run faster on Earth due to the increased gravity field
objects falling on Earth would double in their acceleration
the difference in high tides and low tides would be greater
the Earth's rotation would speed up
everyone' weight on Earth would increase
All of the above would be observed
The following would be observed Time would run faster on Earth due to the increased gravity field. Option A.
If the second moon's gravitational influence is extreme it can produce tremendous flood tides up to 1 kilometer high and frequent tsunamis. It can also lead to increased volcanic activity and earthquakes. The moon rotates in a circle around the earth due to its centripetal force.
Without the centripetal force, the Moon would not follow a circular orbit but would move in a straight line tangent to its orbit. Tides The gravitational pull of the moon pulls the earth especially the part closest to the moon. As a result of this force, the earth's crust rises slightly a few centimeters. Even ponds and lakes like the Great Lakes experience neap tides.
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when you are swimming, you apply a force to the water to move yourself forward. the greater the water pressure you apply, the faster you can swim. which of these statements from newton's laws of motion best explains this situation?
Newton's third law of motion is well explanation for swimming .
Every action has an equal and opposite response, according to Newton's Third Law of Motion. To stay afloat and move forward, swimmers must stroke downward in the water. The force the water uses to try to stop the swimmer from moving is equivalent to and in opposition to this movement. change in a body's orientation or position over time. Translation is defined as movement along a line or a curve. Rotation is a motion that modifies a body's orientation.Therefore ,when you swim, the force that propels you ahead is the force you use to push the water back. Force on the water equals the force a swimmer uses to advance. More force applied to water equals more force applied to you. Pushing water causes the swimmer to go ahead, which is an equal and opposite reaction.
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Use the information in the table to identify the metal with a volume of 1.375 cm3.
By using the information in the table (see attachment), the metal with a volume of 1.375 cm³ is zinc.
What is density?Density simply refers to a ratio of mass to the volume of a physical object such as a metal, gray cube, or tennis ball. Mathematically, the density of a physical object can be calculated by using this formula:
Density = M/V
Where:
M represents the mass of a physical substance or object.V represents the volume of a physical substance or object.Making volume the subject of formula, we have:
Volume = Mass/Density
For the metal aluminum, we have:
Volume = 4.60/2.70
Volume = 1.70 cm³.
For metal zinc, we have:
Volume = 9.81/7.13
Volume = 1.375 cm³.
For metal chromium, we have:
Volume = 6.24/6.18
Volume = 0.87 cm³.
For metal nickel, we have:
Volume = 3.17/8.90
Volume = 0.36 cm³.
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A ball of mass 15kg moving at 10m/s collides with another ball of equal mass at rest. If the two balls moves off together after impact , Caculate their common velocity
Their common velocity is 5m/s.
Given information,
Mass of ball 1 [m1] = 15 kg
Mass of ball 2 [m2] = 15 kg
Velocity of ball 1 [v1] = 10 m/s
Velocity of ball 2 [v2] = 0 m/s
Since, both the balls move off together they have a common velocity.
Let common velocity be v.
Using conservation of momentum, that is
Initial momentum = Final momentum
m1 x v1 + m2 x v1 = [m1 + m2] x v
15 x 10 + 15 x 0 = [15 + 15] x v
150 + 0 = 30v
150 = 30v
v = 5m/s.
∴ Their common velocity is 5m/s.
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A 1520 kg car accelerates at a rate of
1.50 m/s². What is the net force on the car?
Answer:
Your answer is F = 2280 N
Explanation:
The formula for force is [tex]F=ma[/tex]. Given this formula, [tex]1520[/tex] × [tex]1.5[/tex] [tex]= 2280[/tex]
I honestly don't know how to answer the last part of this question, it makes no sense to me:
A SR-71 reconnaissance aircraft, the world's fastest aircraft, is flying east at 3000 km/h. If the plane encounters a cross-wind of 300 km/h that is directed to the north,what is the magnitude and direction of its resultant velocity? If the border is a straight north/southline, will it take more, less or the same time to reach the eastern border of the country with the cross wind vs. without the crosswind? Explain
The resultant velocity of the aircraft is 3015 Km/hr while the direction is 5.7 degrees North of east
What is the resultant velocity?The resultant vector is that vector that has the same effect is magnitude and direction as the two vectors acting together. Recall that velocity is a vector quantity. This implies that the magnitude and the direction of the velocity is very important.
The resultant velocity would now be obtained by considering the directions of the two velocities hence we have to work geometrically and not algebraically. We have to know that the plane is flying east at 3000 km/h. If the plane encounters a cross-wind of 300 km/h that is directed to the north
Thus the resultant velocity is;
R = √(3000)^2 + (300)^2
R = √9 * 10^6 + 9 * 10^4
R = 3015 Km/hr
The direction of this resultant velocity is;
Tan-1 (300/3000)
= 5.7 degrees North of east
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Do you think it’s wise for scientists not to accept a theory immediately, even if the theory has a lot of evidence to support it? Explain your reasoning.
The scientific theory cannot be accepted immediately, because there is always the possibility of discovering new information or modification.
What is a scientific theory?A scientific theory is an explanation of the natural world and universe that has been repeatedly tested in accordance with the scientific method. Theories are tested under controlled conditions in an experiment and are evaluated through principles of abductive reasoning.
A scientific theory differs from scientific law in that a theory explains how or why is a basic observation, whereas a law is a statement about a relationship between facts. Newton’s Law of Gravity is a mathematical equation that can be used to find the attraction between objects, but it is not a theory to describe how gravity works.
If experimental results contrary to predictions of the theory are observed, scientists evaluate whether the experimental design was good and confirm the results by independent replication.
Solutions may need some changes to the theory, or none at all, and after the successive modifications, theories consistently improve and greater accuracy is achieved.
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56.
A scientist is performing an experiment with an object falling in air. His hypothesis is that the time the object takes to fall will be directly proportional to the height from which the object is dropped; if this is true, a graph of fall time versus height will be a straight line. When he graphs his data, the graph is clearly curved, not a straight line. He decides that there must be an error in his measurements and concludes that the hypothesis should be accepted.
Explain how three of the four limitations of science apply to this experiment and to the scientist's conclusion.
The graphs of velocity vs time and acceleration versus time depict the motion of a falling object in a straight line.
The position-time graph depicts how the moving object's position has changed over time.
The displacement-time graph displays the position of the moving object over a time period. This graph shows how far the object has moved from its starting position over the course of time.The velocity-time graph demonstrates the speed of a moving item over a time period.The velocity-time graph, also known as an acceleration-time graph, displays how quickly a moving object changes its speed over time.With regard to the displacement-time graph of the velocity-time graph and the acceleration-time graph i.e. Only the velocity and acceleration of the falling object are depicted in these three graphs as straight lines.
Therefore, the graphs of velocity versus time and acceleration versus time represent the motion of a falling object on a straight line.
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2. The potential energy of an object depends on its _______.
Answer:
homboy it Position
Explanation:
Answer: i think position
Explanation:just thinking
Suppose you replaced the magnesium in part b with an equal weight of sodium. How would this substitution affect the enthalpy of the reaction calculated in the experiment? be specific and justify your answer.
a. The quantity of energy lost or gained during a reaction is equal to its enthalpy change. Exothermic reactions in which hear is produced include the reactions of magnesium and hydrochloric acid.
Mg + 2HCl ---> MgCl2 + H2 + heat
b. The reactivity of sodium is higher than magnesium
What is enthalpy change?Your information is incomplete but the complete question is written below.
Enthalpy change is the quantity of heat evolved or absorbed in a reaction under constant pressure.
The difference between total reactant and total product molar enthalpies estimated for substances in their standard states is the standard enthalpy of reaction for a chemical process.
If the magnesium sample was contaminated with an identical weight of MgCl2, the amount of magnesium is less than required, resulting in less heat evolved during the duration of the reaction and a drop in enthalpy change.
Sodium has a higher reactivity than magnesium. As a result, if magnesium is substituted with an equal amount of sodium, the rate of reaction increases and hence more energy is produced. As a result, enthalpy rises.
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1(a).Suppose your sample of magnesium was contaminated with an equal weight of MgCl2. How would the contamination affect the change in enthalpy for the Mg–HCl reaction? Justify your answer.
1(b) Suppose you replaced the magnesium in Part B with an equal weight of sodium. How would this substitution affect the enthalpy of the reaction calculated in the experiment? Be specific and justify your answer.
5. A 10 kg mass is lifted to a height of 2 m. What is its potential energy at this position? Given Formula
Substitution Answer (with units)
The potential energy at this position is 196 joules.
What is potential energy ?
potential energy stored in energy that depends upon to the relative position of the various parts of a system. A spring has more potential energy when it is the compressed or stretched. A steel ball has more potential energy raised above the ground than it has the after falling to Earth.
Sol-
m=10kg h=2m Ep=mgh Ep=(10kg)(9.8 m/sec2)(2m)
Ep=196J.
The formula for potential energy depends on the force acting on the two objects. For the gravitational force the formula is P.E. = mgh, where m is the mass in kilograms, g is the acceleration due to gravity (9.8 m / s2 at the surface of the earth) and h is the height in meters.
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A ball is dropped from rest from a height of 12 m above the ground. How long will that
ball take to reach the ground?
Answer:
1.56 s
Explanation:
d = 1/2 a t^2 d = distance = 12 m a = 9.81 m/s^2
12 = 1/2 ( 9.81) t^2 shows t = 1.56 s
