CAS PY 79370

subject Type Homework Help
subject Pages 9
subject Words 1214
subject Authors Paul G. Hewitt

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page-pf1
A device that shows the bending of particle trails in liquid hydrogen is a
A) streamer chamber.
B) spark chamber.
C) bubble chamber.
D) all of the above
E) none of the above
Answer:
In the Doppler effect it is important to distinguish between
A) frequency and speed.
B) speed and velocity.
C) speed and acceleration.
D) distance and displacement.
Answer:
A base fiddle is louder than a harp because of its
A) thicker strings.
B) sounding board.
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C) lower pitch.
D) all of the above
E) none of the above
Answer:
The natural background radiation we personally encounter is
A) a trace amount.
B) about a quarter.
C) about half.
D) more than half.
Answer:
Galileo's use of inclined planes allowed him to effectively
A) slow down the ball's changes in speed.
B) reduce the time of the ball's changes in speed.
C) eliminate all changes in speed.
D) eliminate friction.
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Answer:
When sunlight illuminates a page from your Conceptual Physics book it
A) reflects most of it.
B) absorbs at the text lettering.
C) both of these
D) neither of these
Answer:
The speed of a satellite orbiting Earth is given by v = √(GM/d). Escape speed from
Earth is given by v = √(2GM/d), where in both cases G is the gravitational constant, M
is Earth's mass, and d is distance from Earth's center. If a satellite's kinetic energy were
doubled it could
A) orbit at twice its distance from Earth.
B) orbit at four times the distance from Earth.
C) escape Earth.
Answer:
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As a light source blinking at a steady rate approaches you at an increasing speed
(accelerating toward you), the rate at which the blinks encounter you
A) increases.
B) decreases.
C) remains the same.
Answer:
White-hot sparks from a 4th-of-July-type sparkler that strike your skin have relatively
A) high temperatures.
B) few molecules per spark.
C) low transfer of energy.
D) all of the above
E) none of the above
Answer:
To study the energy of photoelectrons we measure
A) the potential difference required to stop them.
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B) the distance traveled in a given time.
C) the time taken to travel a given distance.
D) their temperature.
Answer:
It is correct to say that impulse is equal to
A) momentum.
B) a corresponding change in momentum.
C) force multiplied by the distance it acts.
D) velocity multiplied by time.
Answer:
Consider a monkey wrench released at rest at the far edge of the solar system. Suppose
that it drops to Earth by virtue of only Earth gravity. It will strike Earth's surface with a
speed of about
A) 10 m/s.
B) 8 km/s.
C) 11.2 km/s.
D) the speed of light.
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Answer:
Compared to the energy put into a laser, the energy of the laser beam is
A) usually much more.
B) much less.
C) the same.
D) none of the above
Answer:
Which has greater kinetic energy?
A) a car traveling at 30 km/hr
B) a car of half the mass traveling at 60 km/hr
C) both the same
D) need more information
Answer:
page-pf7
If less horizontal force is applied to a sliding object than is needed to maintain a
constant velocity, the object
A) accelerates in the direction of the applied force.
B) experiences decreased friction.
C) eventually slides to a stop.
D) none of the above
Answer:
When a gas is changed to a liquid, the gas
A) releases energy.
B) absorbs energy.
C) both of these
D) neither of these
Answer:
The safety fuse in an electric circuit is connected to the circuit in
A) series.
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B) parallel.
C) either series or parallel.
Answer:
When an electron and a positron meet and annihilate, the mass-energy of the particles is
carried away by
A) a gamma ray.
B) two gamma rays, otherwise momentum wouldn't be conserved.
C) nothing at all, gone.
Answer:
The density of a 2-cubic meter block of mass of 1000 kg is
A) 100 kg/m3.
B) 200 kg/m3.
C) 500 kg/m3.
D) 1000 kg/m3.
E) none of the above
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Answer:
Which are consequences of different speeds of light in different media?
A) mirages
B) rainbows
C) brilliant colors of diamonds
D) all of the above
E) none of the above
Answer:
Which temperature scales have equal sized degrees?
A) Fahrenheit and Celsius
B) Fahrenheit and Kelvin
C) Celsius and Kelvin
D) none of the above
Answer:
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Two identical particles move toward each other, one twice as fast as the other. Just
before they collide, one has a kinetic energy of 25 J and the other 50 J. At this instant
their total kinetic energy is
A) 25 J.
B) 50 J.
C) 75 J.
D) none of the above
E) need more information
Answer:
Rub electrons from your hair with a comb and the comb becomes
A) negatively charged.
B) positively charged.
C) discharged.
Answer:
A bullet and a proton have the same momentum. Which has the longer wavelength?
A) the bullet
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B) the proton
C) both the same
Answer:
At normal atmospheric pressure and temperature, 1 cubic meter of air has a mass of
about
A) 1.00 kg.
B) 1.25 kg.
C) 2.00 kg.
D) 2.25 kg.
Answer:
Which of these are good insulators?
A) feathers.
B) wood.
C) snow.
D) all the above
E) none of the above
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Answer:
Processes can proceed from disorder to order
A) when input energy is supplied.
B) on an everyday occurrence.
C) never.
D) none of the above
Answer:
The normal force that acts on a block of ice that slides on a ramp
A) is equal to mg at all angles.
B) decreases as the slope of the ramp increases.
C) becomes greatest when the ramp is vertical.
Answer:
page-pfd
Compared with protons, neutrons are more effective nuclear bullets in nuclear reactions
since they have
A) slightly greater mass than a proton.
B) no charge.
C) a wider cross-section than a proton.
D) all of the above
E) none of the above
Answer:
The Sun's elliptical shape at sunset can be adequately explained by
A) Fermat's principle.
B) the law of refraction.
C) both of these
D) neither of these
Answer:
The current produced by a common generator is
A) dc.
page-pfe
B) ac.
C) neither of these
Answer:

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