Unlock document.
This document is partially blurred.
Unlock all pages and 1 million more documents.
Get Access
To see his full height, Blinky Bill who is 1 meter tall needs a mirror that is at least
A) 0.33 m tall.
B) 0.50 m tall.
C) 0.75 m tall.
D) 1 m tall.
E) depends on distance from the mirror.
The fact that a thermometer "takes its own temperature" illustrates
A) thermal equilibrium.
B) energy conservation.
C) the difference between heat and internal energy.
D) the fact that molecules are constantly moving.
Hydrogen, like electricity, is
A) an energy source.
B) not an energy source.
C) a source of both thermal and electric power.
Two protons added to an oxygen nucleus produce
A) heavy oxygen.
B) fluorine.
C) neon.
D) sodium.
E) nitrogen.
The force of friction on a sliding object is 10 N. The applied force needed to maintain a
constant velocity is
A) more than 10 N.
B) less than 10 N.
C) 10 N.
According to relativity theory, if a space trip finds a son or daughter biologically older
than their parents, then the space trip is taken by the
A) son or daughter.
B) parents.
C) either of these
D) neither, it can't be done.
A machine puts out 100 watts of power for every 1000 watts put into it. The efficiency
of the machine is
A) 10%.
B) 50%.
C) 90%.
D) 110%.
E) none of the above
Food in a pressure cooker is cooked faster due to
A) higher temperature.
B) greater rate of bubble formation in the water.
C) energy transfer in the water.
D) all of the above
E) none of the above
Whether a truck comes to a stop by crashing into a haystack or a brick wall, the impulse
is
A) greater with the haystack.
B) greater with the brick wall.
C) both the same
Astronomers can tell whether a light source approaches or recedes from Earth by
A) its temperature.
B) its change in temperature.
C) its absorption spectra.
D) the Doppler effect.
E) all of the above
When no forces act on moving objects their paths are normally
A) straight lines.
B) circles.
C) ellipses.
D) all of the above
Two charged particles repel each other with a force F. If the charge of both particles is
tripled and the distance between them is also tripled, then the force will be
A) F.
B) 2 F.
C) F/2.
D) F/4.
E) none of the above
Support a horizontal toothpick at both ends. Then do likewise for a log of the same kind
of wood. There is more sag in the
A) toothpick.
B) log.
C) same in each
The electric field between oppositely-charged parallel plates is
A) uniform.
B) stronger at the ends.
C) composed of field lines in opposite directions.
D) none of the above
What did Robert Brown see in his microscope?
A) straight-line motion
B) circular motions
C) parabolic motions
D) random motions
Electrical forces inside a nucleus contribute to nuclear
A) stability.
B) instability.
C) both of these
D) neither of these
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
Microscopic slush in ice water tends to make water density
A) lower.
B) higher.
C) sustain at one value.
If a non-rotating object has no acceleration, then we can say for certain that it is
A) at rest.
B) moving at constant non-zero velocity.
C) in mechanical equilibrium.
D) all of the above
E) none of the above
A 1-centimeter cubed sugar cube scaled up by a factor of 10 has a total surface area of
A) 60 cm2.
B) 600 cm2.
C) 6000 cm2.
D) none of the above
When a star collapses to form a black hole, its mass
A) increases.
B) decreases.
C) remains the same.
Nellie tosses a ball upward at an angle. Neglecting air resistance, the vertical
component of the initial velocity
A) decreases with time to reach the top.
B) remains constant.
C) increases with time to reach the top.
Induced electric and magnetic fields result in
A) electromagnetic waves.
B) stronger electric or magnetic fields.
C) higher voltages produced by Faraday induction.
D) all of the above
E) none of the above
The electric field established by a battery in a dc circuit
A) increases via the inverse-square law.
B) changes magnitude and direction with time.
C) acts in one direction.
D) is non-existent.
E) none of the above
A car with closed windows makes a left hand turn. A helium-filled balloon in the car
moves to the
A) right.
B) left.
C) front.
D) back.
E) none of the above
After rolling halfway down an incline, 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.
The speed of a 4-kg ball with a momentum of 12 kg m/s is
A) 3 m/s.
B) 4 m/s.
C) 12 m/s.
D) 48 m/s.
E) none of the above
If you look at yourself in a pocket mirror, then hold the mirror farther away, you see
A) more of yourself.
B) less of yourself.
C) the same amount of yourself.
If a weighted air-filled balloon sinks in deep water, it will
A) likely sink to an equilibrium level before reaching bottom.
B) likely burst if water pressure is great enough.
C) be acted on by a continuously decreasing buoyant force.
D) none of the above
When Rutherford directed a stream of alpha particles at a gold foil, some particles
A) bounced back.
B) continued through the foil.
C) deflected at a variety of angles.
D) all of the above
E) none of the above
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.
Relativity equations for time, length and momentum hold true for
A) relativistic speeds.
B) everyday low speeds.
C) both of these
D) neither of these
The amplitude of a wave is 1 meter. The crest-to-trough distance of the wave is
A) 0.5 m.
B) 1 m.
C) 2 m.
D) none of the above
If you leave the refrigerator door open in a closed room, the room temperature will
A) increase.
B) decrease.
C) be unaffected.
The air that you breathe doesn't emit visible light indicates that most of the electrons of
its atoms are
A) in the ground state.
B) excited to metastable states.
C) relatively cool.
D) electrically neutral.
E) relatively far apart.
