When ice crystals collapse at the surface of ice, the result is a
A) thin film of water.
B) slippery surface.
C) both of these.
D) none of the above
Sunlight passing through a pinhole in a piece of card casts a solar image on the ground.
If the card is held so the image exactly covers a coin, measurements will show you
could fit 110 coins between the image and the card. This further tells you
A) 110 Suns would fit between the top of the card and the Sun.
B) that this activity is useful for estimating the Sun’s diameter.
C) both of these
D) neither of these
When the momentum of a punch is stopped by the fighter’s jaw while he moves into the
oncoming punch, the result is
1) an increase in the relative velocity of the blow,
2) a decrease in the time of contact of the blow,
which thereby most greatly increases the
3) force.
4) impulse.
5) momentum.
6) inertia.
7) energy.
Reverberation of sound occurs for
A) sound interference.
B) forced vibrations.
C) re-echoed sound.
D) resonance.
E) none of the above
Project a cannonball from atop Newton’s hypothetical mountain at 8 km/s and it orbits
Earth. Project it at 9 km/s and the shape of the orbit is
A) a somewhat larger circle.
B) a wide parabola.
C) an ellipse.
Power is transmitted at high voltages because the corresponding current in the wires is
A) also high to deliver appreciable power to distant places.
B) low so that overheating of the wires is minimized.
C) either of these
D) neither of these
The attraction between Earth and Sydney is equal to her weight. The reaction to Earth’s
pull on Sydney is
A) Sydney pushing against Earth’s surface.
B) the support of Earth’s surface on Sydney.
C) Sydney’s pull on Earth.
D) none of the above
Rainbows exist because light is
A) reflected.
B) refracted.
C) both of these
D) neither of these
The magnetic fields of a pair of nearby magnets can
A) only add.
B) cannot add or subtract.
C) add or subtract by vector rules.
The strength of a beam is most related to its
A) cross section.
B) length.
C) both of these
The high voltage that is important in a power line is high voltage
A) between the parallel wires of the line.
B) from one end of each power line to the other.
C) both of these
D) neither of these
A light woman and a heavy man jump from an airplane at the same time and open their
same-size parachutes at the same time. Which person will get to a state of zero
acceleration first?
A) The light woman
B) The heavy man
C) Both should arrive at the same time.
D) not enough information
The change in internal energy of adding 100 joules to a system that does 60 joules of
work is
A) 0 J.
B) 40 J.
C) 60 J.
D) 100 J.
E) none of the above
A large heavy truck and a small baby carriage roll down a hill. Neglecting friction, at
the bottom of the hill, the baby carriage will likely have
A) less momentum.
B) about the same momentum.
C) more momentum.
In the equation E = hf, the symbol E stands for
A) excitation.
B) efficiency.
C) energy.
D) all of the above
A new Moon appears in the sky just before the time of a
A) solar eclipse.
B) lunar eclipse.
C) both of these
D) neither of these
You drive your car at a constant 60 km/h along the highway. You apply the brakes until
the car slows to 40 km/h. If at that moment you suddenly release the brakes, the car
tends to
A) momentarily regain its higher initial speed.
B) continue moving at 40 km/h.
C) decrease in speed if no other forces act.
Science is a body of knowledge that
A) describes order in nature.
B) is an ongoing human activity.
C) condenses knowledge into testable laws.
D) all of the above
E) none of the above
A vehicle undergoes acceleration when it
A) gains speed.
B) loses speed.
C) changes its direction.
D) all of the above
Two lightning bolts are seen to strike two distant locations at the same time. Seen from
a different location, the two lightning bolts
A) will also be seen at the same time.
B) will not be seen at the same time.
C) may or may not be seen at the same time.
In photoelectric emission, the work function is the minimum
A) frequency of light to produce emission.
B) energy required to eject an electron from the surface.
C) energy an emitted electron possesses.
D) none of the above
A large ice cube containing an iron railroad spike floats in a brim-full container of
water. When the ice cube melts,
A) water spills over.
B) no change in water level occurs.
C) water level in the container drops.
Compared to a giant iceberg, a hot cup of coffee has
A) more internal energy and higher temperature.
B) higher temperature, but less internal energy.
C) a greater specific heat and more internal energy.
D) none of the above
The spacing between the parallel power lines is affected by
A) current-carrying capacities of wires.
B) electrical insulation.
C) the wing span of birds in the vicinity.
D) none of the above
When you rub your hands together, you
A) can push harder on one hand than the other.
B) cannot push harder on one hand than the other.
C) need more information
A ball starting from rest at the top of an inclined plane gains a speed of 2 m/s for each
second it rolls. What is its acceleration down the incline?
A) 0.5 m/s2
B) 1 m/s2
C) 2 m/s2
D) 4 m/s2
The planet Jupiter is about 300 times as massive as Earth, yet on its surface you would
weigh only about 3 times as much because
A) your mass is 100 times less on Jupiter.
B) Jupiter is significantly farther from the Sun.
C) Jupiter’s radius is about 10 times Earth’s radius.
D) you are 100 times more weightless there.
E) none of the above
If two copper wires of the same length have different thickness, then the thicker wire
has
A) more resistance.
B) less resistance.
C) both the same
A main difference between a radio wave and a sound wave is
A) frequency.
B) wavelength.
C) energy.
D) amplitude.
E) medium or no medium.
A car by itself is capable of a certain maximum acceleration. When it tows a car of the
same mass, its maximum acceleration is
A) one half.
B) one third.
C) one fourth.
D) the same.
E) none of these
The fundamental force underlying all chemical reactions is
A) gravitational.
B) nuclear.
C) centripetal.
D) electrical.
E) none of the above
A quantum of light is called
A) a proton.
B) a neutron.
C) an electron.
D) a neutrino.
E) none of the above