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The force on an electron moving in a magnetic field will be least when its direction is
A) the same as the magnetic field direction.
B) perpendicular to the magnetic field direction.
C) either of these
D) neither of these
A 2500-N pile-driver ram falls 10 m and drives a post 0.1 m into the ground. The
average impact force on the ram is
A) 2,500 N.
B) 25,000 N.
C) 250,000 N.
D) 2,500,000 N.
Earth's gravitational field extends
A) only above and beyond Earth's surface and cancels inside Earth.
B) both inside and outside Earth and throughout the entire universe.
C) neither of these
Voltage is most similar to
A) pressure.
B) current.
C) resistance.
D) all of the above
E) none of the above
Light travels from one place to another along a path of least
A) distance.
B) time.
C) effort.
D) expense.
E) complication.
If the mass of a cart is quickly loaded to have twice the mass while a propelling force
remains constant, the cart's acceleration
A) quadruples.
B) doubles.
C) stays the same.
D) halves.
E) none of these
When slow-moving water molecules collide they tend to
A) rebound without sticking.
B) stick.
C) both of these
D) neither of these
Monkey Mo hangs from the middle of a horizontal rope. Tension in the rope is greatest
if the rope
A) sags a lot.
B) sags very little.
C) sags or doesn't sag, for tension is the same in any case.
D) none of the above
Fred swings a sheet of copper in pendulum fashion between the poles of a strong
magnet. The sheet slows in entering the magnetic field because it
A) induces swirling currents in the copper and accompanying magnetic fields that resist
motion.
B) experiences both air and magnetic friction.
C) is repelled by free electrons in the copper.
D) none of the above
In the Doppler effect it is important to distinguish between
A) frequency and speed.
B) speed and velocity.
C) speed and acceleration.
D) distance and displacement.
Which best shields you from sunburn when at the beach?
A) a cloudy day
B) a sheet of glass between you and the Sun
C) frequent turning of your body
D) all of the above
E) none of the above
Minimal orbit speed about Earth is about 8 km/s, and about Jupiter is
A) less than 8 km/s.
B) more than 8 km/s.
C) about 8 km/s.
To keep chickens in a chicken coop warm, the kind of lamp to use is
A) fluorescent.
B) CFL.
C) incandescent.
D) LED.
E) all about the same
Light from a laser is
A) monochromatic.
B) in phase.
C) coherent.
D) all of the above
E) none of the above
Strictly speaking, the sum of the angles on a triangle equals 180 degrees
A) in flat space.
B) on a spherical surface.
C) on a saddle-shaped surface.
D) all or any of the above
E) none of the above
The crystals in matter are held together by
A) cohesive forces.
B) amorphous forces.
C) electrical bonding forces.
D) excess neutrons.
An Earth satellite is in an elliptical orbit. The satellite travels faster when it is
A) nearest Earth
B) farthest from Earth
C) constant speed everywhere in orbit
and in close orbit travels faster when orbiting
4) the Moon.
5) Earth.
6) both about the same for the same altitudes.
When we enlarge a photograph of an iron ring, the image of the hole becomes
A) smaller.
B) larger.
C) neither smaller nor larger.
A 5000-kg freight car collides with a 10,000-kg freight car at rest. They couple upon
collision and move at 2 m/s. What was the initial speed of the 5000-kg car?
A) 4 m/s
B) 5 m/s
C) 6 m/s
D) 8 m/s
E) none of the above
A completely submerged object always displaces its own
A) volume of fluid.
B) weight of fluid.
C) density of fluid.
D) all of the above
E) none of the above
A bare roof on a warmly heated home on a snowy day indicates
A) an unwanted flow of heat
B) poor insulation.
C) fairly good conductivity.
D) all of the above
Two charges that are separated by one meter exert 1-N forces on each other. If the
charges are pushed together so the separation is 25 centimeters, the force on each
charge will be
A) 1 N.
B) 2 N.
C) 4 N.
D) 8 N.
E) 16 N.
As the filament of a lamp is heated it changes
A) temperature.
B) color.
C) both of these
D) neither of these
Small openings between leaves in a tree act as pinholes. The round spots of light cast on
the ground below are images of
A) the Sun.
B) the openings themselves.
C) both of these
D) neither of these
The polarization axes of glasses for 3-D viewing are
A) vertical.
B) horizontal.
C) at right angles to each other.
If you comb your hair and the comb becomes positively charged, then your hair
becomes
A) positively charged.
B) negatively charged.
C) uncharged.
The Earth is closer to the Sun in January than in July, which accounts for the fact that
the highest high tides in the Northern Hemisphere occur in
A) winter.
B) spring.
C) summer.
D) none of the above
If your automobile runs out of fuel while driving, the engine stops. You don't come to
an abrupt stop due to
A) inertia.
B) gravity.
C) resistance.
D) the principle of continuation.
The radiation curve for a red hot fire-place poker peaks in the
A) infrared region.
B) green region.
C) ultraviolet region.
When a magnet is moved to and fro in a wire coil, voltage is induced. If the coil has
twice as many loops, the voltage induced is
A) half.
B) the same.
C) twice.
D) four times as much.
E) none of the above
