You can swing your legs to and fro more frequently when your legs are
A) straight.
B) bent.
C) same either way
When holes are drilled through the wall of a water tower, water will spurt out with the
greatest speed from the hole closest to
A) the bottom of the tower.
B) the middle of the tower.
C) the top of the tower.
D) all the same
A fan attached to an ice sailcraft stalled on a windless day blows air into the sail that
bounces backward upon impact. The boat
A) moves in the direction of the wind impact force.
B) does not move by this wind impact.
C) moves, but in the opposite direction of the wind impact force.
When two lamps are connected in parallel to a battery, the electrical resistance that the
battery senses is
A) more than the resistance of either lamp.
B) less than the resistance of either lamp.
C) none of these
At night an underwater scuba diver aims a flashlight beam toward the surface at 15o to
the normal. Upon emerging into the air, the beam angle will be
A) less than 15o.
B) 15o.
C) more than 15o.
D) impossible to predict.
A substance that heats up relatively quickly has a
A) high specific heat capacity.
B) low specific heat capacity.
C) either of these
D) neither of these
The exhaust product from a hydrogen fuel cell is
A) carbon dioxide.
B) methane.
C) pure water.
D) nitric acid.
When a star collapses to form a black hole, its mass
A) increases.
B) decreases.
C) remains the same.
In a 1-g gravitational field, 1 second after turning on a flashlight its beam will curve
beneath a perfectly straight line by
A) less than 4.9 m.
B) 4.9 m.
C) more than 4.9 m.
If you double the frequency of a vibrating object, its period
A) doubles.
B) halves.
C) is quartered.
In choosing between sound waves and radio waves, which has the greater speed?
A) sound wave
B) radio wave
C) both the same
D) need more information
Both electrons and protons have equal-magnitude
A) mass.
B) charge.
C) energy.
D) all of the above
E) none of the above
Your friend says that any radio wave travels appreciably faster than any sound wave.
A) agree with your friend unconditionally
B) agree with your friend for most common cases
C) disagree with your friend
D) find a new friend
An atomic mass unit (amu) is 1/12 the mass of
A) an electron.
B) a proton.
C) a hydrogen atom.
D) a carbon atom.
E) a uranium atom.
A jumbo jet has a mass of 100,000 kg. The thrust for each of its four engines is 50,000
N. What is the jet’s acceleration when taking off?
A) 0.25 m/s2
B) 1 m/s2
C) 2 m/s2
D) 4 m/s2
E) none of the above
A red shift for light indicates that the light source is moving
A) toward you.
B) away from you.
C) both of these
D) neither of these
A shock wave is produced when a wave source moves
A) nearly as fast as the waves it produces.
B) as fast as the waves it produces.
C) faster than the waves it produces.
D) none of the above
A balloon will stick to a wooden wall if the balloon is charged
A) negatively.
B) positively.
C) either of these
D) neither of these
The number of nodes, including the end points, in a standing wave that is three
wavelengths long is
A) 4.
B) 5.
C) 6.
D) 7.
E) none of the above
The force exerted on the tires of a car that directly accelerate it along a road is exerted
by the
A) engine.
B) tires.
C) air.
D) road.
E) none of the above
A 10-N block and a 1-N block lie on a horizontal frictionless table. To impart equal
horizontal accelerations, we would have to push the heavier block with
A) an equal force.
B) 10 times as much force.
C) 10 squared or 100 times as much force.
D) 1/10 as much force.
E) none of the above
It takes Neptune a longer time to orbit the Sun than Earth does because Neptune
A) has much further to go.
B) goes much slower.
C) both of these
D) none of these
A bubble of air released from the bottom of a lake
A) rises to the top at constant volume.
B) becomes smaller as it rises.
C) becomes larger as it rises.
D) alternately expands and contracts as it rises.
E) none of the above
Both Newton and Kepler considered forces on the planets. Kepler mistakenly
hypothesized the direction of the forces to be
A) along their directions of travel.
B) perpendicular to their directions of travel.
C) toward the Sun.
D) none of the above
Place a 1-kilogram block of iron at 40oC into 1 kilogram of water at 20oC and the final
temperature of the two becomes
A) less than 30o C.
B) at or about 30o C.
C) more than 30o C.
The metal detectors that people walk through at airports operate via
A) Ohm’s law.
B) Faraday’s law.
C) Coulomb’s law.
D) Newton’s laws.
E) civil laws.
X-rays are emitted by way of
A) ionizing radiation.
B) transitions within an atom’s innermost electrons.
C) transitions within the atomic nucleus.
D) none of the above
An inventor discovers a harmless and tasteless salt, which when added to water changes
its boiling point. The market value for this salt will be better if the salt
A) lowers the boiling point of water.
B) raises the boiling point of water.
C) either raises or lowers the boiling point, as the food would be cooked either way.
D) none of the above
When ice water at 0o C is heated
A) thermal expansion occurs.
B) thermal contraction occurs.
C) both occur until 4oC is reached
A ball rolled along a horizontal surface maintains a constant speed because
A) its velocity remains constant.
B) no horizontal force acts on it.
C) of inertia.