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In the formation of a cloud, moist air rises and
A) expands.
B) cools.
C) condenses.
D) all of the above
E) none of the above
Answer:
Two life preservers have identical volumes, one filled with Styrofoam and the other
filled with sand. When the two life preservers are worn by swimmers, one swimmer
floats with part of the preserver above water, and the other swimmer sinks. In this case
the buoyant force is greater on the life preserver filled with
A) Styrofoam.
B) sand.
C) same for both
Answer:
The change in momentum that occurs when a 1.0 kg ball traveling at 4.0 m/s strikes a
wall and bounces back at 2.0 m/s is
A) 2 kg m/s.
B) 4 kg m/s.
C) 6 kg m/s.
D) 8 kg m/s.
Answer:
Neglecting friction, a small and a large block of ice begin sliding down an incline
together. The larger block reaches the bottom
A) before the small block.
B) after the small block.
C) at the same time as the small block.
Answer:
The earliest and most influential Greek philosopher was Aristotle, who among many
contributions taught that
A) the four elements are earth, water, air, and fire.
B) all motion is either natural or violent.
C) violent motion requires a sustained push or pull.
D) all of the above
Answer:
The statement, "There are regions beneath Earth's crust that will always be beyond the
reach of scientific investigation" is
A) a fact.
B) speculation.
C) a hypothesis.
D) a scientific statement.
E) a theory.
Answer:
Atoms heavier than helium were at one time manufactured by
A) photosynthesis.
B) thermonuclear fusion.
C) radiant energy conversion.
D) radioactivity.
E) none of the above
Answer:
Planets wobble in their orbits due to
A) the gravitational attraction to other planets.
B) uncertainties in the inverse-square law.
C) elliptical-orbit quirks.
D) all of the above
E) none of the above
Answer:
It is difficult to see the roadway when driving on a rainy night mainly because
A) light scatters from raindrops and reduces the amount of light reaching your eyes.
B) of additional condensation on the inner surface of the windshield.
C) the film of water on your windshield provides an additional reflecting surface.
D) the film of water on the roadway makes the road less diffuse.
E) none of the above
Answer:
Which experiences the least electrical force in an electric field?
A) alpha particle
B) beta particle
C) electron
D) gamma ray
E) all the same
Answer:
The buoyant force acting on a 10-ton ship floating in the ocean is
A) less than 10 tons.
B) 10 tons.
C) more than 10 tons.
D) depends on density of sea water
Answer:
You can get a sunburn while under the "shade" of a beach umbrella due to
A) reflected sunlight from the sand.
B) refracted sunlight from the water.
C) light scattering in the air.
D) none of the above
Answer:
A feather and a coin dropped in a vacuum fall with equal
A) forces due to gravity.
B) accelerations.
C) kinetic energies.
D) none of these
Answer:
Diffraction from foghorns is best if the waves being diffracted are
A) long.
B) short.
C) either of these
D) neither of these
Answer:
Stephanie dips a glass rod into vegetable oil. The submerged part of the rod can't be
seen because
A) refraction is unbent before light gets to your eye.
B) both the oil and glass have the same index of refraction.
C) of internal reflection.
D) light has different speeds in the oil and glass.
Answer:
Two identical blocks of iron are placed in contact, one at 10oC and the other at 20oC. If
the cooler block cools to 5oC and the warmer block warms to 25oC, this would violate
the
A) first law of thermodynamics.
B) second law of thermodynamics.
C) third law of thermodynamics.
D) none of the above
Answer:
The pitch of a guitar relates to the string's
A) length.
B) tension.
C) mass.
D) all the above
E) none of the above
Answer:
A swimming area in a rotating space habitat is located in a region of 1/4 g. If a diver
can jump 1 m high in a 1-g region, how high can the same diver jump in the swimming
area?
A) 1 m
B) 2 m
C) 4 m
D) 16 m
E) more than 16 m
Answer:
If you're on a Ferris wheel at a carnival, seated 10 m from the Ferris wheel's axis that
makes a complete rotation each minute, your linear speed is
A) 10 m/min.
B) 31.4 m/min.
C) 62.8 m/min.
D) 100 m/min.
E) need more information
Answer:
Direct current is normally produced by a
A) battery.
B) generator.
C) both of these
D) neither of these
Answer:
When you flick a card from beneath a coin that hardly moves, you're illustrating
A) inertia.
B) equilibrium.
C) support force.
D) friction.
Answer:
Two protons attract each other gravitationally and repel each other electrically. The
stronger of these two forces is
A) gravitation.
B) electrical.
C) neither of these
Answer:
The support force on a 30-kg dog sleeping on the floor is
A) less than 300 N.
B) about 300 N.
C) more than 300 N.
D) nonexistent while asleep.
Answer:
Which statement is correct?
A) charge flows in a circuit
B) voltage flows in a circuit
C) resistance flows in a circuit
D) all of the above
Answer:
Two isotopes that undergo nuclear fission are
A) U-235 and Pu-239.
B) Th-238 and U-235.
C) all of these
D) none of these
Answer:
The Moon does not crash into Earth because
A) Earth's gravitational field is relatively weak at the Moon.
B) gravitational pull of other planets keeps the Moon up.
C) Moon has a sufficient tangential speed.
D) Moon has less mass than Earth.
E) none of the above
Answer:
A block of wood with a piece of iron tied to the top of it floats in a bucket of water. If
the wood and iron are turned over so that the iron is submerged beneath the wood, the
water level at the side of the bucket
A) rises.
B) falls.
C) remains the same.
Answer:
When ejected electrons from a photosensitive surface are confined within the material
we have a
A) photovoltaic cell.
B) light-emitting diode.
C) both of these
D) none of these
Answer:
The scientific method is most effective in
A) making hypotheses.
B) gaining, organizing, and applying new knowledge.
C) discovering new things.
D) making theories.
E) performing experiments.
Answer:
A bowling ball and a baseball accelerate equally when falling in a vacuum because
A) their velocities are the same.
B) the ratio of their weights to mass is the same.
C) the force of gravity is the same for each in a vacuum.
D) the force of gravity does not act in a vacuum.
E) none of the above
Answer:
A hydraulic jack is used to lift objects such as automobiles. If the input force is 200 N
over a distance of 1 meter, the output force over a distance of 0.1 meter is ideally
A) 200 N.
B) 500 N.
C) 1000 N.
D) 2000 N.
E) none of the above
Answer:
While standing, your blood pressure is normally greatest in your
A) head.
B) heart.
C) feet.
D) same in each
Answer:
A 1-kg rock that weighs 10 N is thrown straight upward at 20 m/s. Neglecting air
resistance, the net force that acts on it when it is half way to the top of its path is
A) less than 10 N.
B) 10 N.
C) more than 10 N.
Answer:
If a turntable's rotational speed is doubled, then the linear speed of a pet hamster sitting
on the edge of the record will
A) double.
B) halve.
C) remain the same.
Answer:
