a free body diagram of a car slowing down would typically include the following elements:
The car, represented by a rectangle or square
The ground or road, represented by a horizontal line or plane
An arrow pointing downward representing the force of gravity acting on the car
An arrow pointing horizontally to the right representing the force of friction acting on the car
An arrow pointing horizontally to the left representing the applied force or deceleration of the car
The diagram would also include any other relevant forces, such as air resistance or the force of the brakes, represented by additional arrows. It is important to label each force with its magnitude and direction to understand the forces acting on the car and how they affect its motion.
Question 25 What major factor explains the quick adoption of new programs?O One political party supports the program.O The media draws attention to the particular issue. O The public does not hold a very strong opinion on the issue. O There are many interest groups active on both sides of the policy. O The public holds wide enthusiasm for a program. Question 18 1 p What is an important difference in our current political system compared to when the Constitution was created and ratified?O National leaders were only beholden to their own consciences in the past. O National leaders were more careerist and served in the legislature for several decades in the earlier era. O Politics was much more collegial in the previous era. O There was much more openness and transparency in the previous era.O There was much more accountability in the previous era.
The Major factor explaining the quick adoption of new programs is media draw attention to particular issue.
Our constitution gave our leaders enormous powers and didn't think about how to lead them.
Our Constitution says that 100 sinners may be released, but the innocent should not be punished and blindly obeyed.
Our Constitution contained no rule that the Constitution could be amended or amended only for a limited period of time, but under the strict guidelines of the Constitutional Commission, unlimited amendments were allowed. This provision for the government may prevent the government from doing other work. It also gave some good results.
As you can see in the preface above, “social, economic and political justice. Sometimes, what existed at the economic level is just a giveaway, even for the sake of the name.
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g what is the decibel level of a sound that is seven times as intense as a 65.7 db sound? db (b) what is the decibel level of a sound that is one-fourth as intense as a 65.7 db sound?
The decibel level of sound for intense of seven times and one fourth is 2.98 and 0.74 dB level.
We use a unit of measurement called the decibel (dB) to measure the noise level of various sounds. Represents the intensity of the sound. We use hertz (Hz) to measure the frequency of sound.Every time the decibel level of a sound increases by 10, its intensity is multiplied by 10. However, the decibel scale is logarithmic, not linear. Therefore, a sound of 10 dB is 10 times more intense than a sound of 0 dB, a sound of 20 dB is 100 times more intense, and a sound of 30 dB is 1000 times more intense.ds=65.7 dl
=65.7/22=2.98
We use the decibel scale to determine how loud sounds are and whether they are safe or harmful to human hearing. The range of sounds measured on the decibel scale is from 0 dB (the quietest sound) to 140 dB i.e. the pain threshold.ds'=2.98/4=0.74
Sounds above 85 dB are considered dangerous to human hearing by specialized organizations such as NIOSH (US National Institute for Occupational Safety and Health). This means that sounds above this level can result in hearing damage or hearing loss depending on the length of your exposure.To learn more about noise level -
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Alpha waves signify ________ sleep.
Alpha waves signify deep sleep.
Alpha waves are brain waves that are associated with relaxed alertness. They have a frequency of 8-13 Hz, which makes them the slowest of the frequency bands. They are most commonly seen in awake adults who are in a relaxed, awake state of consciousness. Alpha waves are associated with creativity, concentration, and relaxation.
Alpha waves are the most common type of brain wave, and they are associated with a relaxed, wakeful state of mind. Alpha waves are generally present during light meditation and relaxation and signify a state of relaxation and alertness. When alpha waves are present, the brain is in a state of deep relaxation, and this is when the body is able to repair itself and restore itself.
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at a distance of 6 meters, a person with average vision is able to clearly read letters 1.0 cm high.
The height of the image that will be magnified on the retina will be 0.0022833m or .22833cm and it will be inverted.
What is magnification?
When anything is magnified, its seeming size is increased rather than its real size. This enlargement is quantified using a mathematical quantity called "magnification." When this number is less than one, a drop in size is frequently referred to as "magnification" or "de-magnification."
Briefing:
Given,
The distance of, u = 6 meters
The lens distance from the retina, v = 1.7 cm
The height of the object, hu = 1 m
We have to find the size of letters that appears in the retina, hv;
Here,
Magnification, M = -v/u = [tex]\frac{h_{v} }{h_{u} }[/tex]
- 0.017/6 = hv/1
hv = -0.017/6
hv = -0.002833m
The image height will be 0.002833 m and it will be inverted.
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g a four-leg urban stop-controlled intersection experiences high control delays during peak hours. the traffic analysis showed that installing signals would reduce control delay by 20 seconds per vehicle during morning peak 6-9 am and evening peak 4-7 pm. average hourly volume during peak hours at the intersection is 1800 vehicles/hour.
This means that the installation of signals would save 1800 vehicles/hour * 20 seconds/vehicle = 36000 seconds of control delay per hour during the morning and evening peaks.
As A four-leg urban stop-controlled intersection is experiencing high control delays during peak hours. The traffic analysis showed that installing signals would reduce control delay by 20 seconds per vehicle during the morning peak (6-9 am) and evening peak (4-7 pm) hours. This can be translated to a reduction of control delay by 600 minutes per hour, or 10 hours per day during the peak hours. The installation of signals can greatly improve the traffic flow and reduce congestion and wait times for drivers at this intersection.
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Three point charges are arranged at the corners of a square of side L as shown in the figure. What is the potential at the fourth corner (point A), taking V =0 at a great distance?
E4 = kQ.[2/a2 + 1/a2] appears to reflect the electric field at the fourth corner as a result.
What makes it a "electric field"?A characteristic of matter called an electric discharge generates multiple objects to either attract or repel each other depending on how it is charged (positive or negative). A region of space surrounding a static electricity particle or object known as an electrostatic potential is one in which an electricity would experience force.
Why is the electric field crucial?A personality electromagnetic field like light also requires a grasp of the electric field idea. We now have a mechanism to explain how starlight traverses enormous stretches of vacant desert in order to reach our eyes thanks to the electric field notion.
Briefing:Number of point charges = 3
E4 = E1 + E2 + E3
E4 = kQ/a2 + kQ/√(2a2) + kQ/a2
E4 = kQ.[ 1/a2 + 1/√(2a2) + 1/a2 ]
E4 = kQ.[ 2/a2 + 1/a√2 ]
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The resistance of an electric stove element at operating temperature is 11Ω.
a. If 220 V is applied across it, what is the current through the stove element?
b. How much energy does the element convert to thermal energy in 30.0 s?
c. The element is used to heat a kettle containing 1.20 kg of water. Assume that 65 percent of the heat is absorbed by the water. What is the water’s increase in temperature during the 30.0 s?
A. The current through the stove is 20 A
B. The energy converted to thermal energy is 132000 J
C. The increase in temperature during the 30 s period is 17 °C
A. How do I determine the current?
The current through the stove can be obtained as follow:
Resistance (R) = 11 ΩVoltage (V) = 220 VCurrent (I) =?Voltage (V) = Current (I) × resistance (R)
220 = Current × 11
Divide both sides by 11
Current = 220 / 11
Current = 20 A
B. How do I determine the energy?
The energy can be obtained as shown below:
Resistance (R) = 11 ΩVoltage (V) = 220 VTime (t) = 30 sEnergy (E) =?E = V²t / R
E = (220² × 30) / 11
E = 1452000 / 11
Energy = 132000 J
C. How do I determine the increase in temperature?
The increase in temperature can be obtained as follow:
Mass of water (M) = 1.20 Kg = 1.2 × 1000 = 1200 gEnergy = 132000 JPercentage absorbed = 65%Heat absorbed (Q) = 65% × 132000 = 85800 JSpecific heat capacity of water (C) = 4.184 J/gºC Increase in temperature (ΔT) =?Q = MCΔT
85800 = 1200 × 4.184 × ΔT
85800 = 5020.8 × ΔT
Divide both side by 5020.8
ΔT = 85800 / 5020.8
ΔT = 17 °C
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in a region of space, an electromagnetic wave moves to the right, as indicated in the above diagram. at one moment, the magnitude of the electric field at the indicated point is 2662, and its direction is out of the page. at this point and time, what is the magnitude of the associated magnetic field?
Given that the magnetic field is perpendicular to both the electrostatic potential and the electromagnetic wave, its strength will be equal to E/c, where c is the speed of light.
Why is electromagnetic energy used?Wire coils with electricity running through them are used to create electromagnets. The coils of copper in an electromagnet behave like a magnet when an electric current flows through them because moving charges produce magnetic fields.
Its name is electromagnetic for a reason.And we refer to these waves as "electromagnetic" because they include magnetic fields in addition to electric fields. We also refer to them as "waves" because, like all other waves that we have seen, they travel outward in accordance with wave equations.
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will the particle move to the right (in the positive x -direction) or to the left (in the negative x -direction), and why?
Yes, the particle moves in the positive x-direction (to the right) or the negative x-direction (to the left) due to the forces of attraction and repulsion.
When the particle's velocity is positive, it is travelling to the right. When the velocity is negative, it also moves to the left. A body with a higher mass may have a lower moment of inertia than a body with a lower mass. This relies on the mass distribution and axis with respect to which we are computing the moment of inertia. In real-world situations, we frequently avoid dealing with particles.
The time it takes for a constant force to bring a particle to rest, on the other hand, is represented by its momentum.
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q3. if you know all of the forces acting on a moving object, can you tell in which direction the object is moving? if the answer is yes, explain how. if the answer is no, give an example.
you cannot simply determine a direction in which the object traveling because it shall depend on the time the force is acting.
How to use Newton's laws?
The second Newton's law states that:
F = m*a
This says "force equals mass times acceleration".
Where acceleration is the rate of change of the speed. From that equation, we conclude that the acceleration is in the same direction that the net force.
So, if we know all the forces acting on an object, we know the net force acting on it, then we know the direction of the acceleration.
Is this enough to know the direction in which it is moving?
No, the object does not need to move in the same direction than its acceleration, the direction of motion will also depend on the initial velocity of the object (if it is initially moving with constant speed).
If we don't know that, we can't find the direction of motion.
An example of this can be a car going at 100km/h east-wise.
Then we apply a net force due west, then we have an acceleration due west. But as the initial direction of motion was east, the car will still move to the east, but the velocity will decrease gradually.
So as you can see in that example, we need to know the initial velocity to know the direction in which the object is moving.
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how much heat needs to be removed from 100 g of 85°c water to make -5°c ice?
The amount of heat that needs to be removed from 100 g of 85°c water to make -5°c ice is 70194 J of heat.
What is the heat change when 100 g of 85°C water changes to -5°C ice?The amount of heat that needs to be removed is calculated below.
Heat changes involved are as follows:
Heat change from water at 85°C to water at 0°C = mc₁ΔT₁
Heat change from water at 0°C to ice at 0°C = mL
Heat change from ice at 0°C to ice at -5°C = mc₂ΔT₂
where
m is mass = 100 g
c₁ is the specific heat capacity of water = 4.184 J/g/K
ΔT₁ is temperature change = 85°C
L is the latent heat of fusion of ice = 336 J/g
c₂ is the specific heat capacity of ice = 2.06 J/g/K
ΔT₁ is temperature change = 5°C
Heat change = (100 * 85 * 4.184) + (100 * 336) + (100 * 5 * 2.06)
Heat change = 70194 J
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elon musk of space-x plans to send a human crew to the nearby proxima centauri star system by 2050. true false
This statement is false .
Space-X is only planning for Mars colonization. Alpha centauri is just a proposal. so, it is False
Entrepreneur Elon Musk founded SpaceX as for reshaping the aerospace sector and bringing about a more accessible type of space travel. With the Falcon 1 rocket, a two-stage, liquid-fueled vehicle built for launching miniature satellites into orbit, the corporation entered the fray.
In accordance with the NASA Commercial Crew Program, this is the sixth SpaceX flight to carry people, including the Demo-2 test voyage to the space station in 2020.
Entrepreneur Elon Musk founded SpaceX in the goal of reshaping the aerospace sector and bringing about a more accessible type of space travel.
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which one of the following statements concerning electromagnetic waves is false? (1.5 points) (a) electromagnetic waves carry energy. (b) x-rays have longer wavelengths than radio waves. (c) in vacuum, all electromagnetic waves travel at the same speed. (d) lower frequency electromagnetic waves can be produced by oscillating circuits. (e) they consist of mutually perpendicular electric and magnetic fields that oscillate perpendicular to the direction of propagation.
The incorrect option is (b) X-rays have longer wavelengths than radio waves
Visible light is the term used to describe radiation at wavelengths that humans can see. Your radio detects radio waves, which have much longer wavelengths than visible light. While visible light has a much longer wavelength than X-rays, the latter have much shorter ones.Radio waves are easygoing and weak. Mist can diffuse them, water can short them out, iron beams or plates can stop them. When they strike humans, they cause only a slight warming, unless kilowatts are directly focused on a body as in a microwave (which uses radio waves). We can communicate with the aid of radio waves, which are our friends.They manage to tear right through many materials, and if they do stop, they tear atoms apart into ions, molecules into fragments, often radicals. They can mutate DNA and have often terrible consequences on progeny if they strike sperm or egg cells. You can use X-rays to image a body’s insides, but you want to be very careful about it.To study more about X rays -
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Sam's job at the amusement park is to slow down and bring to a stop the boats in the log ride.
Part A
If a boat and its riders have a mass of 800 kg and the boat drifts in at 1. 4 m/s how much work does Sam do to stop it?
The amount of work which Sam does need to stop the boat is 784Joule if boat mass is 800kg and boat drift in 1.4m/sec.
We know that according to work-energy theorem, change in kinetic energy of the body from one speed to another is equivalent to amount of work done by all forces acting on the body.
So, here we can see that final speed of boat is =0m/sec since Sam need to stop it.
Initial speed of boat is 1.4m/sec.
Also, we know that kinetic energy is given by the below formula:
Kinetic energy=(1/2)mv²
where m is the mass of the body
and v is the speed of the body
Now, from work energy theorem, we get
=>W=(1/2)m[tex]v^2_2[/tex] - (1/2)m[tex]v^2_1[/tex]
=>W=0-(1/2)×800×(1.4)²
=>W= - 400× 1.4 × 1.4
=>W = -400×1.96
=>W= -784Joule
Here negative sign denotes work has to done against the original motion of boat.
Hence, amount of work needs to be done by Sam is 784Joule.
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suppose etienne wants to calculate the velocity of the mass in the simulation, given the period, t, mass, m, and spring constant, k. why does hakim say it is not possible to use the kinematic equation v
There is currently no established method that can replicate gravity other than actual mass or acceleration.
The mass physics classroom's focal point is...
The location of the mass's center A position relative to an object or set of objects is known as the center of mass. It is the system's average location, weighted by the mass of each component. The center of mass is situated at the centroid for straightforward stiff objects with homogeneous density.
Mass simulation: what is it?
By 1800, the concept of denudation—the surface lowering of the land caused by mass waste and erosion—had been developed. It is implied by the term "planation" that denudation will continue until the land is reduced to a low plain just above the base level of erosion, which is usually the sea.
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the law of reflection states that when light rays reflect off a surface the angle of incidence a. is one-half the angle of reflection. c. is twice the angle of reflection. b. equals the angle of reflection. d. equals the angle of refr
The law of reflection states that when light rays reflect off a surface the angle of incidence is equal to the angle of reflection.
The process by which light rays strike a surface and are reflected back is called light reflection.
The laws of reflection is the principle or rule that governs the phenomenon of light reflection.
The law of reflection states that a ray of light will bounce off a surface at the same angle at which it struck it when it comes into contact with it. The angle at which the light ray strikes the surface is known as the angle of incidence and the angle at which the light ray reflects from the surface is known as the angle of reflection. The law can also determine how the light beam will behave.Therefore according to the law of reflection, the angle of incidence is always equal to the angle of reflection.
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(6) Different colors of light correspond to different: frequencies (I) intensities (I) wavelengths (A) |only (B) Il only (C) Ill only (D) !and IlI (E) all of the above
They are red, orange, yellow, green, blue, indigo, and violet, in descending order of frequency. They are arranged in reverse order by wavelength because of the inverse relationship. Violet is the hue that occurs most frequently.
What do the various light colors represent?The wavelength of visible light affects its color. These wavelengths span the spectrum, from 700 nm at the red end to 400 nm at the violet.
Do different wavelengths of light correspond to different colors?VISIBLE LIGHT WAVELENGTHS When the entire visible light spectrum passes through a prism, the wavelengths divide into the rainbow's hues because each color has a unique wavelength.
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a neutral atom that consists of positive and negative charge is placed at location . this neutral atom has a known polarization . what is the separation length of the induced dipole? define the net electric field at a as 'e'. please answer as a formula; you may use the terms 'k', 'alpha', 'q', 'd', 'e', and 's'.
The separation length of induced dipole is [tex]E_{net}[/tex] =[tex]\frac{kq}{d^{2} }[/tex] ( 1 + [tex]\frac{s}{8d}[/tex] ) leftward.
What is dipole moment?
A charge separation results in dipole moments. Dipole moments are caused by changes in electronegativity and can appear in ionic bonds between two ions or covalent bonds between atoms. The dipole moment increases with increasing electronegativity disparity. Another element affecting the size of the dipole moment is the distance between the charge separations. A molecule's polarity can be determined by its dipole moment.
We have,
Electric field due to dipole = E₂
As negative charge is nearer then the electric field will be toward the dipole.
E₁ = [tex]\frac{kqs}{r^{3} }[/tex] = [tex]\frac{kqs}{(2d)^{3} }[/tex] = [tex]\frac{kqs}{8d^{3} }[/tex]
Now, electric field due to single charge -q = E₂
E₂ = [tex]\frac{kq}{r^{2} }[/tex] = [tex]\frac{kq}{d^{2} }[/tex]
[tex]E_{net}[/tex] = E₁ + E₂ = [tex]\frac{kq}{d^{2} }[/tex] ( 1 + [tex]\frac{s}{8d}[/tex])
So, [tex]E_{net}[/tex] = [tex]\frac{kq}{d^{2} }[/tex] (1 + [tex]\frac{s}{8d}[/tex] ) leftward.
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A film with thickness t gives constructive interference for light with a wavelength in the film of λfilm. How much thicker would the film need to be in order to give destructive interference?
A. 2λfilm
B. λfilm
C. λfilm/2
D. λfilm/4
Light with a wavelength in the film's thickness t exhibits constructive interference.
What exactly is a damaging interference?
When two waves are entirely out of phase (a peak is located in the middle of two waves), destructive interference ensues. In other words, destructive interference occurs when two waves 180 degrees or radians apart from each other cancel each other out.
What causes waves to interfere destructively?
When two waves' maxima are 180 degrees out of phase, destructive interference happens: a positive displacement of one wave is precisely cancelled by a negative displacement of the other wave. The resultant wave has zero amplitude.
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what is the number n of the highest harmonic that could be heard by a person who is capable of hearing frequencies up to f
The 24th harmonic is the highest that could be heard by a person.
A wave or signal that is harmonic has a frequency that is an integral (whole number) multiple of the frequency of the source signal or wave that it is being compared to. The frequency of such a signal or wave relative to the frequency of the reference signal or wave is also referred to as a component of the harmonic series by the word. The first harmonic is sometimes referred to as the basic frequency or initial wave. Higher harmonics are the next harmonics in the series. In addition to the total number of harmonics being periodic at that particular frequency, the fundamental frequency of all harmonics is also.
The word "harmonic" is used in a variety of industries, including music, radio, and all other wave-based technologies.
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An object with a mass of 1.5 kg changes its velocity from +15 m/s to +22 m/s during a time interval of 3.5 seconds. What impulse was delivered to the object?
Answer:
10.5kgm/s
Explanation:
mass(m) = 1.5kg
initial velocity(u) = 15m/s
final velocity(v)= 22m/s
time(s) = 3.5 sec
impulse = force × time
force = change in momentum/time taken
f= m(v-u)/t
f = 1.5( 22 – 15 ) / 3.5
f= 1.5 ( 7 ) /3.5
f= 10.5/3.5
f = 3N
impulse = force × time
I = f × t
I = 3 × 3.5
I = 10.5 kgm/s
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which model of the universe is currently the most accepted in light of the discovery of dark energy?
An accelerating universe is currently the most accepted in light of the discovery of dark energy.
A hypothesized energy known as "dark energy" acts in opposition to gravity by exerting a repellent, negative pressure. It has been proposed to explain the observable characteristics of far-off type Ia supernovae, which reveal the universe is expanding at a faster rate than usual.
Saul Perlmutter, Brian Schmidt, and Adam Riess are the recipients of the 2011 Nobel Prize in Physics. They made the stunning conclusion that the universe's expansion is speeding up as a result of their observations of far-off stars exploding.
The distance measurements utilizing type Ia supernovae (SN Ia) for the galaxies at high redshift provide the most direct and compelling evidence for the expanding cosmos powered by dark energy.
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Why is impulse a vector?
Answer:
Impulse is defined as, It is defined as the product of net force and the length of time it was applied. As we know that momentum and force are both vectors, therefore impulse is also a vector.
explanation:
Since force is a vector quantity, impulse is also a vector quantity. Impulse applied to an object produces an equivalent vector change in its linear momentum, also in the resultant direction.
you fly from seattle, washington to salt lake city, utah and then from salt lake city to portland, oregon. describe the meaning of adding the two velocity vectors together for each trip. explain how you could estimate the total time the entire trip would take using the vectors.
One simple resultant vector is produced when two vectors are added. Depending on the quantity that the resultant vector represents, we can infer its meaning.
What is the best way to merge two velocity vectors?In order to directly sum the two velocities, we can use the formulae v tot = v x 2 + v y 2 v tot = v x 2 + v y 2 and = tan 1 (v y / v x) = tan 1 (v y / v x).
Adding vectors produces what outcome?A resulting displacement results from the addition of displacement vectors. The only requirement is that the two vectors must be of the same vector quantity in order to add them. There will be a consequent velocity if two additional velocity vectors are added. There is a resultant force when two vectors are added.
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if the astronaut was instead standing on the mon, woul dit required more, less, or the same amount of energy to escape the system?
The mass and size of the moon also affect its gravitational pull. The moon won't draw things toward itself with the same force as the Earth because it has a lot less gravity than the latter.
What causes gravitational pull?The fact that spacetime actually bends and curves due to the mass of all objects, including our Earth, is what enables gravity to draw you toward the ground. That curvature is what you perceive as gravity. The magnitude of gravity's influence increases with the number of masses (also called the gravity force).
What intensifies the gravitational pull?According to Newton's law, the strength of gravity or between two materials is determined by their mass and distance from one another. Greater gravitational attraction exists between heavier things.
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for a projectile with initial velocity of 40.9 m/s and angle of elevation equal to 6 degrees. compute the horizontal velocity of the projectile in m/s. 40.6759 m/s compute the vertical velocity in m/s.
The horizontal and vertical components of the velocity are 41.1 m/s and 389 m/s respectively.
The initial velocity of the projectile = 40.9 m/s
The angle of elevation = 6°
The horizontal and vertical components of the velocity can be found using the formula,
Horizontal component, cosθ = v/vₓ
Vertical component , sinθ = v/vₙ
where θ is the angle of the elevation
v is the initial velocity
vₓ and vₙ are horizontal and vertical components of the velocity respectively.
Let us substitute the known values in the above equation. We get
Horizontal component:
cos 6° = v / vₓ
0.961 = 40.9 / vₓ
vₓ = 40.9/0.995
= 41.1 m/s
Vertical component
sin 6° = 40.9 / vₙ
0.105 = 40.9 / vₙ
vₙ = 40.9 / 0.105
= 389 m/s
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a thin, circular hoop is released at the top of an incline that is 8:0 mlong and makes an angle of 370 above the horizontal. what is its speed at the bottom of the incline? assume it rolls without slipping. a. 5:5 m
The speed at the bottom of the incline is 6.87 m per second.
What is conservation of energy?The conservation of the energy is a fundamentally law of physics, chemistry stating that the total of the energy of an isolated by the system is constant despite internally changes. It is mostly common expressed as “energy can neither to be created nor destroyed”, and it is the basis of the first-ever law of the thermodynamics.
As per the given question
The length of the inclined plane L= 8.00m
angle of inclination is = 37°
Height of the inclined plane h= L sin ø
(8.00m) sin 37°
=4.814 m
Let's take m= mass of hoop
Let's take r=radius of hoop
Let's v be the velocity of the hoop bottom to the inclined plane.
Now we can apply conservation of energy at the top of the inclined plane and at to the bottom of the inclined plane.
mgh = ¹/₂ mv²
mgh = ¹/₂ mv² + ¹/₂ Iω²
Where, I = moment of inertia
ω = angular velocity
I = L/ω
mgh = ¹/₂ mv² + ¹/₂ (L/ω)ω²
mgh = ¹/₂ mv² + ¹/₂ Lω
mgh = ¹/₂ mv² + ¹/₂ mvrω
ω = vr
mgh = ¹/₂ mv² + ¹/₂ mvrvr
gh = ¹/₂ v² + ¹/₂ (vr)²
gh = ¹/₂v² (1 + r²)
v=gh
v=√(9.8m/s^2)(4.814m)
v=6.87 m/s
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Which of the following device can be used for measurement of frequency?
a) Voltmeter
b) Ammeter
c) Stroboscope
d) None of the mentioned
A stroboscope is a tool for measuring frequency that makes use of a second reference voltage with a predetermined frequency. Ammeters are used to measure current, while Voltmeters are used to measure voltage.
Which two instruments are used to measure frequency?
We provide two different types of frequency meters among our measuring tools: laboratory frequency meters (tabletop), which have a measurement range of 0.1 Hz to 1.5 GHz, and pocket frequency meters, which have a measurement range of 10 Hz to 2,6 GHz.
What is a frequency measurement device?
A gadget that shows the periodicity of an electrical signal is a frequency meter. The employment of various mechanical frequency meters has changed over time, but since the 1970s, digital frequency counts have mostly taken their place.
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a car travels 11.8 m north and then travels 13.3 m east. what is the magnitude of the car's displacement?
The magnitude of car's displacement is 17.78 m.
Given that, distance travelled due north is 11.8 m
Distance travelled due east is 13.3 m
As it is said that the car travels north and then east, it forms the two sides of a right-angled triangle. The magnitude of third side is the magnitude of car's displacement.
From Pythagoras theorem, the expression for car's displacement can be written as,
AC² = AB² + BC²
where, AB and BC are the sides of the right triangle
AC is the displacement of the car
Making AC as subject, we have,
AC = √(AB² + BC²) = √(11.8² + 13.3²) = √(139.24 + 176.89) = 17.78 m
Thus, the magnitude of car's displacement is 17.78 m.
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Two hydrogen atoms collide head on. The collision brings both atoms to a halt. Immediately after the collision, both atoms emit a 121.6 nm photon. What was the speed of each atom just before the collision?
Both atom emit a photon with a wavelength of 121.6 nm right after colliding. Atomic speed is defined as v = 44.2 * 103 m/s.
What does "speed" mean in physics?The rate at which site of an object shifts in any axis. Speed is described as the ratio of the distance covered to the time required to cover that length.
How do you locate examples of speed?That really is speed Equals distance time. Alternatively, you can calculate the time by dividing the distance traveled by the speed. You can figure out the third input if you know one of the inputs. For instance, if a car drives 120 miles in 2 hours, we may calculate the speed as 120 x 2 = 60 kilometers per hour.
Briefing:wavelength λ=121.6nm.
Energy, K=E
1/2mv*v = hc/λ
V² = hc/2λ
v²= 2(6.62*10⁻³⁴)(3*10⁸)/ (1.67*10⁻²⁷) (121.6*10⁻⁹)
v = 44.2 * 10³m/s
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