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MORE PHYS100 FINAL

Terms in this set (47)

A truck is moving at constant velocity. Inside the storage compartment, a rock is dropped
from the midpoint of the ceiling and strikes the floor below. The rock hits the floor
A) exactly below the midpoint of the ceiling.
B) ahead of the midpoint of the ceiling.
C) behind the midpoint of the ceiling.
D) More information is needed to solve this problem.
A) exactly below the midpoint of the ceiling
A vehicle that weighs 4000 N on the surface of the Earth is travelling in outer space at a speed of 200 m/s. The smallest constant force that must be applied to stop it in 20 seconds is
A) 20 N.
B) 40 N.
C) 400 N.
D) 4000 N.
E) more than 4000 N.
D) 4000 N
A 10-kg brick and a 1-kg book are dropped in a vacuum. The force of gravity on the 10-kg brick is
A) the same as the force on the 1-kg book.
B) 10 times as much.
C) one-tenth as much.
D) zero.
B) 10 times as much
A feather and a coin will have equal accelerations when falling in a vacuum because
A) their velocities are the same.
B) the force of gravity is the same for each in a vacuum.
C) the force of gravity does not act in a vacuum.
D) the ratio of each object's weight to its mass is the same. E) none of these
D) the ratio of each object's weight to its mass is the same
A bullet is fired from a gun. The speed of the bullet will be about the same as the speed of the recoiling gun
A) because momentum is conserved.
B) because velocity is conserved.
C) because both velocity and momentum are conserved. D) if the mass of the bullet equals the mass of the gun.
E) none of these
D) if the mass of the bullet equals the mass of the gun
A popular swinging-balls apparatus consists of an aligned row of identical elastic balls that are suspended by strings so they barely touch each other. When two balls are lifted from one end and released, they strike the row and two balls pop out from the other end. If instead one ball popped out with twice the speed of the two, this would be a violation of conservation of
A) momentum.
B) energy.
C) both of these
D) none of these
B) energy
Suppose that a tiny gun made of a strong but very light material fires a bullet that is more massive than the gun itself. For such a weapon
A) the target would be safer than the shooter.
B) recoil problems would be lessened.
C) conservation of energy would not hold.
D) conservation of momentum would not hold.
E) both conservation of energy and momentum would not hold.
A) the target would be safer than the shooter
Two billiard balls having the same mass and speed roll toward each other. What is their combined momentum after they meet?
A) 0
B) half the sum of their original momentums
C) twice the sum of their original momentums
D) impossible to determine without additional information
A) 0
A 5000-kg freight car runs into a 10,000-kg freight car at rest. They couple upon collision and move with a speed of 2 m/s. What was the initial speed of the 5000-kg car?
A) 4 m/s
B) 5 m/s
C) 6 m/s
D) 8 m/s
C) 6 m/s
After rolling halfway down an incline (starting from rest), a marble's kinetic energy is
A) less than its potential energy.
B) greater than its potential energy.
C) the same as its potential energy.
C) the same as its potential energy
Which has greater kinetic energy, a car traveling at 30 km/hr or a car of half the mass traveling at 60 km/hr?
A) the 30 km/hr car
B) the 60 km/hr car
C) Both have the same kinetic energy.
D) More information is needed about the distance traveled.
B) the 60 km/hr car
Suppose you are at the center of a large freely- rotating horizontal turntable in a carnival funhouse. As you crawl toward the edge, the angular momentum of you and the turntable
A) decreases.
B) increases.
C) remains the same, but the RPMs (revolutions per minute) decrease.
D) decreases in direct proportion to your decrease in RPMs.
C) remains the same, but the RPMs decrease
In which one of these media does sound travel the fastest? A) water vapor
B) water
C) ice
D) steam
E) Sound travels the same speed in each of the above media.
C) ice
When you tune a radio to a certain station, you match the frequency of the internal electrical circuit to the frequency of the wanted radio station. In so doing you are employing the principle of
A) forced vibrations.
B) resonance.
C) beats.
D) reverberation.
E) wave interference.
B) resonance
Sound waves can interfere with one another so that no sound results.
A) True
B) False
C) Either true or false, depending on the air temperature.
A) true
The loudness of a musical sound is a measure of the sound wave's
A) wavelength.
B) frequency.
C) speed.
D) amplitude.
E) all of these
D) amplitude
A main difference between gravitational and electric forces is that electrical forces
A) attract.
B) repel or attract.
C) obey the inverse-square law.
D) act over shorter distances.
E) are weaker.
B) repel or attract
Rub electrons from your hair with a comb and the comb becomes
A) negatively charged.
B) positively charged.
C) discharged.
A) negatively charged
Two protons attract each other gravitationally and repel each other electrically. By far the greater force is
A) the gravitational attraction.
B) the electrical repulsion.
C) neither - the forces are the same.
B) the electrical repulsion
A balloon will stick to a wooden wall if the balloon is charged
A) negatively.
B) positively.
C) either positively or negatively.
D) None of the above choices are correct.
C) either positively or negatively
When the distance between two charges is halved, the electrical force between the charges
A) quadruples.
B) doubles.
C) halves.
D) is reduced by 1/4.
E) None of the above choices are correct.
A) quadruples
A conductor differs from an insulator in that a conductor
A) has more electrons than protons.
B) has more protons than electrons.
C) has more energy than an insulator.
D) has faster moving molecules.
E) none of these
E) none of these
The source of all magnetism is
A) tiny pieces of iron.
B) tiny domains of aligned atoms.
C) ferromagnetic materials.
D) moving electric charge.
E) none of these
D) moving electric charge
The field surrounding every moving electron is
A) always magnetic but never electric.
B) always electric but never magnetic.
C) sometimes magnetic and sometimes electric.
D) always both electric and magnetic.
E) none of the above
D) always both electric and magnetic
Magnetism is due to the motion of electrons as they
A) move around the nucleus.
B) spin on their axes.
C) Choices A and B are both correct.
D) None of the above choices are correct.
C) choices A and B are both correct
Superconducting electromagnets
A) exist now.
B) may be possible in the near future.
C) may be possible in the distant future.
D) are science fiction.
A) exist now
Which of these electromagnetic waves has the shortest wavelength?
A) radio waves
B) infrared waves
C) X-rays
D) ultraviolet waves
E) light waves
X-rays
Electromagnetic waves consist of
A) compressions and rarefactions of electromagnetic pulses.
B) oscillating electric and magnetic fields.
C) particles of light energy.
D) high-frequency gravitational waves.
B) oscillating electric and magnetic fields
Compared to its average speed in air, the average speed of a beam of light in glass is
A) more.
B) less.
C) the same.
B) less
The cones in the retina of the eye are
A) most densely packed at the center of vision.
B) uniformly spread along the visual field.
C) concentrated along the periphery of vision.
A) most densely packed at the center of vision
In the periphery of our vision, we are
A) more sensitive to low frequencies than high ones.
B) insensitive to color and movement.
C) sensitive to movement, but cannot see color.
D) sensitive to both movement and color.
E) none of these
C) sensitive to both movement and color
If the sun were to disappear right now, we wouldn't know about it for 8 minutes because it takes 8 minutes
A) for the sun to disappear.
B) to operate receiving equipment in the dark.
C) for light to travel from the sun to the Earth.
D) all of these
E) none of these
C) for light to travel from the sun to the Earth
If a light signal and a radio signal were emitted simultaneously from Alpha Centauri, the first to reach Earth would be the
A) radio signal.
B) light signal.
C) both would reach Earth at the same time.
C) both would reach earth at the same time
What is the wavelength of an electromagnetic wave that has a frequency of 1 hertz?
A) less than 1 m
B) 1 m
C) more than 1 m
C) more than 1m
Glass is opaque to wave frequencies that
A) match its natural frequencies.
B) are below its natural frequencies.
C) both of these
D) none of these
A) match its natural frequencies
Which interacts more with light of relatively high frequencies?
A) large particles
B) small particles
C) both the same
B) small particles
The sky is blue because air molecules in the sky act as tiny A) mirrors which reflect only blue light.
B) resonators which scatter blue light.
C) sources of white light.
D) prisms.
E) none of these
B) resonators which scatter blue light
The sun is more likely to appear red at sunset than in the middle of the day as a result of the
A) scattering of lower frequencies by larger particles in the air.
B) longer path of air through which sunlight travels.
C) lower frequencies of light emitted late in the day by the sun.
D) pollutants emitted by humans in daylight hours.
E) absorption effects of the smaller particles in the air.
B) longer path of air through which sunlight travels
The function of polarizing filters in viewing 3-D slides or movies is to provide each eye
A) the ability to see parallax.
B) a balanced intensity.
C) an independent left or right-hand view.
D) a stereoscopic view.
E) with light polarized at right angles to each other.
C) an independent left or right-handed view
Interference colors in a soap bubble give evidence that the soap film
A) has two reflecting surfaces.
B) is thin.
C) both of these
D) neither of these
C) both of these
Which of the following is a property of light waves, but not of sound waves?
A) frequency
B) wavelength
C) amplitude
D) polarization
E) none of these
D) polarization
Consider plane waves incident upon a barrier with a small opening. After passing through the opening, the waves
A) continue as plane waves.
B) fan out.
C) converge.
D) become polarized.
E) all of these
B) fan out
To perceive greater detail a dolphin emits sounds of
A) lower frequency.
B) higher frequency.
C) greater intensity.
D) greater speed.
E) none of these
B) higher frequency
The ratio of the energy of a photon to its frequency is
A) pi.
B) Planck's constant.
C) the photon's speed.
D) the photon's wavelength.
E) not known.
B) Plank's constant
Which has more energy per photon?
A) red light
B) blue light
C) Both have the same energy.
B) blue light
According to the uncertainty principle, the more we know about a particle's momentum, the less we know about its
A) kinetic energy.
B) mass.
C) speed.
D) location.
E) none of these
D) location
A bullet and a proton have the same momentum. Which has the longer wavelength?
A) the bullet
B) the proton
C) Both have the same wavelength.
C) both have the same wavelength
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