PHY 44234

subject Type Homework Help
subject Pages 9
subject Words 1302
subject Authors Paul G. Hewitt

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page-pf1
The half-life of a radioactive substance is affected by
A) pressure.
B) temperature.
C) age.
D) all of the above
E) none of the above
Answer:
A dolphin perceives greater detail by emitting sounds of
A) lower frequency.
B) higher frequency.
C) greater intensity.
D) greater speed.
E) none of the above
Answer:
On a cold day your feet feel warmer on a rug than on a tile floor because a rug
A) is usually warmer than tile.
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B) is a poorer conductor.
C) for the same mass has more internal energy than tile.
D) all of the above
E) none of the above
Answer:
It is correct to say that in electric circuits
A) charge flows through a circuit.
B) flowing charge is current.
C) voltage is applied across a circuit.
D) voltage is the ratio of energy per charge.
E) all of the above
Answer:
For a scientific hypothesis to be valid, there must be a test for proving it
A) right.
B) wrong.
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C) conclusively one way or the other.
Answer:
The orbital path of a satellite has two focal points. When both focal points are together
A) the satellite path is an ellipse.
B) the satellite path is a circle.
C) satellites lose speed.
Answer:
A key feature of the Falkirk Wheel in Scotland is that opposite gondolas have the same
weight when both are brim-full of water
A) and boats in each have about equal weights.
B) and at least one boat is in each gondola.
C) regardless of the weights of boats or no boats in each.
D) none of the above
Answer:
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A principle difference between an MHD generator and a conventional generator is that
the MHD generator
A) has no moving parts.
B) operates more efficiently at high temperatures.
C) both of these
D) neither of these
Answer:
Ten seconds after starting from rest, a car is moving at 40 m/s. What is the car's
acceleration?
A) 0.25 m/s2
B) 2.8 m/s2
C) 4.0 m/s2
D) 10 m/s2
E) 40 m/s2
Answer:
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A moving object has
A) speed.
B) velocity.
C) momentum.
D) energy.
E) all of these
Answer:
When tuning a radio to a particular station, you match the frequency of the internal
electrical circuit with the frequency of the wanted radio station. What principle is being
employed?
A) forced vibrations
B) resonance
C) beats
D) reverberation
E) wave interference
Answer:
According to the Bohr model, an electron in an excited state of hydrogen can emit
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A) at most a single photon until the atom re-excites.
B) several photons in a series of transitions to a lower state.
C) a continuous stream of light.
D) none of the above
Answer:
Which produces a greater tidal effect in your body, the Moon or a 1-kg melon held at
arm's length above your head?
A) the Moon
B) the melon
C) both about equally
Answer:
Steam burns are more damaging than burns caused by boiling water because steam
A) has more energy per gram than boiling water.
B) releases additional energy when it condenses.
C) both of these
D) neither of these
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Answer:
A river 100 m wide flows 1 m/s due south. A boat that travels 1 m/s relative to the water
is pointed due east as it crosses from the west bank. Relative to its starting point, the
boat travels
A) nowhere.
B) 100 m.
C) 141 m.
D) 200 m.
E) more than 200 m.
Answer:
Three 10-ohm resistors take the shape of a triangle, one resistor in each leg. Connecting
an ohm-meter across any two points of the triangle will show the equivalent resistance
to be
A) 1.4 ohms.
B) 5 ohms.
C) 6.7 ohms.
D) greater than 6.7 ohms.
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Answer:
The reason that evaporation is a cooling process is
A) radiation of heat during the process.
B) due to conduction and convection.
C) the more energetic molecules escape the liquid.
D) all of the above
E) none of the above
Answer:
A machine that promises more energy output than input is
A) a fantasy.
B) commonplace in today's technology.
C) a long-shot worth investing in.
Answer:
page-pf9
Toss a baseball bat into the air and it wobbles about its
A) geometrical center.
B) center of mass.
C) heavier end.
Answer:
The distance a freely falling bowling ball falls each second
A) is about 5 m.
B) is about 10 m.
C) increases.
D) none of the above
Answer:
Which of these strongly relate to a saxophone and clarinet?
A) vibrating air
B) length of tube.
C) both of these
D) neither of these
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Answer:
The density of a submerged submarine at rest is about the same as the density of
A) a crab.
B) iron.
C) a floating submarine.
D) water.
E) none of the above
Answer:
A suitable electric pump in an electric circuit is a
A) chemical battery.
B) generator.
C) both of these
D) neither of these
Answer:
page-pfb
A new theory conforms to the correspondence principle when it
A) corresponds to all theories in nature.
B) updates the essence of the old theory.
C) connects two or more theories.
D) accounts for verified results of the old theory.
Answer:
Spectral lines take the shape of vertical lines because
A) the light is vertically polarized.
B) they are images of a vertical slit.
C) the energy levels in the atom are parallel to one another.
D) all of the above
E) none of the above
Answer:
page-pfc
If a car increases its velocity from zero to 60 m/s in 10 seconds, its acceleration is
A) 3 m/s2.
B) 6 m/s2.
C) 60 m/s2.
D) 600 m/s2.
Answer:
A watch dial that continues to glow after a week in the dark is almost certainly
A) fluorescent.
B) phosphorescent.
C) polarized.
D) radioactive.
Answer:
A truly educated person is knowledgeable about
A) science.
B) the arts.
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C) religion.
D) all of the above
Answer:
The paths of fragments of fireworks are
A) normally straight lines.
B) parabolas.
C) different from the paths of projectiles.
Answer:
Ice has a lower density than water because ice
A) molecules are more compact in the solid state.
B) molecules vibrate at lower rates than water molecules.
C) is composed of open-structured crystals.
D) density decreases with decreasing temperature.
Answer:
page-pfe
The center of mass of a human body is located at a point that
A) is fixed, but different for different people.
B) is always directly behind the belly button.
C) changes as a person bends over.
D) none of the above
Answer:
A weightless astronaut in an orbiting satellite is
A) shielded from Earth's gravitational field.
B) beyond the pull of gravity.
C) like the satellite, pulled by Earth's gravitation.
D) none of the above
Answer:

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