An apple falls from a tree and hits the ground 5 meters below with a speed of about
A) 5 m/s.
B) 10 m/s.
C) 15 m/s.
D) 20 m/s.
E) not enough information
The secondary rainbow is dimmer than the primary rainbow mainly because
A) its colors are inverted.
B) it is larger, and its energy is spread over more area.
C) it is farther from the viewer.
D) it simply has less energy than the primary bow.
E) of an extra reflection and refraction in the drops.
For every action force, there must be a reaction force that
A) acts in the same direction.
B) is slightly smaller in magnitude than the action force.
C) is slightly larger in magnitude than the action force.
D) is equal in magnitude.
An electron is pushed into an electric field where it acquires a 1-V electrical potential.
If two electrons are pushed the same distance into the same electric field, the electrical
potential of the two electrons is
A) 0.25 V.
B) 0.5 V.
C) 1 V.
D) 2 V.
E) 4 V.
Nellie hangs from a pair of ropes at an angle. Tension in the ropes depends on the
A) length of the ropes.
B) angle of the ropes.
C) both of these
D) neither of these
Imagine a single charge q placed on one corner of a square, and that the electric field at
the center of the square is F/q. If additional equal charges are placed on the other three
corners, the electric field at the center of the square due to these four equal charges is
A) F/q.
B) 4F/q.
C) F/(2q).
D) F/(4q).
E) none of the above
A pair of toy freight cars, one twice the mass of the other, fly apart when a compressed
spring that joins them is released. Acceleration will be greater for the
A) heavier car.
B) lighter car.
C) same on each.
Thomas Young’s two-source interference patterns demonstrate the
A) particle nature of light.
B) wave nature of light.
C) both of these
D) neither of these
Buoyant force is greater on a submerged 1-cubic centimeter block of
A) lead.
B) aluminum.
C) same on each
Radio waves that diffract more around small buildings are
A) AM.
B) FM.
C) both diffract equally
The mass of air inside an average mid-size automobile is about
A) 0.2 kg.
B) 2 kg.
C) 20 kg.
D) 200 kg.
E) 2000 kg.
If Nellie hangs from a horizontal bar that is supported by four vertical ropes, the tension
in the ropes
A) are each half her weight.
B) are each equal to her weight.
C) add to equal her weight.
D) none of the above
Earth’s magnetic field is
A) something we’ve learned to live with.
B) useful to pigeons but not to humans.
C) protective to life on Earth.
An Earth satellite in an elliptical orbit has its smallest speed
A) closest to Earth.
B) when getting farther from Earth.
C) when farthest from Earth.
D) need more information
You photograph the image of your little sister, who stands 2 meters in front of a plane
mirror. Holding the camera beside her head, the distance to her image is
A) 1 meter.
B) 2 meters.
C) 3 meters.
D) 4 meters.
E) none of the above
Rapid change of a magnetic field induces
A) a magnetic field of greater magnitude.
B) a magnetic field of the same magnitude.
C) an electric field.
If you toss a coin straight upward in train that slows while the coin is in the air, the coin
will land
A) as if you were at rest.
B) in front of you.
C) in back of you.
As Bronco Brown steps off a hovering high-flying helicopter and falls through the air,
he experiences
A) an impulse.
B) an increasing speed.
C) a decreasing acceleration.
D) all of the above
When air drag affects the motion of projectiles, they don’t travel
A) as high.
B) as far.
C) both of these
D) neither of these
The solar constant for Earth is
A) 0.7 kW/m2.
B) 1.0 kW/m2.
C) 1.4 kW/m2.
D) more than 1.4 kW/m2.
Light will NOT pass through a pair of Polaroids when their axes are
A) 45 degrees to each other.
B) parallel.
C) perpendicular.
D) all of the above
E) none of the above
Escape speed from Earth is
A) 8 km/s.
B) 9 km/s.
C) 11.2 km/s.
D) 63 km/s.
While a car travels around a circular track at a constant speed, its
A) acceleration is zero.
B) velocity is zero.
C) inertia is zero.
D) none of the above
The toy drinking bird nicely illustrates
A) evaporation.
B) condensation.
C) both of these
D) neither of these
If you were caught in freezing weather with only a candle for heat, you would be
warmer in
A) an igloo.
B) a tent.
C) a wooden house.
D) a car.
Which light source is more energy-efficient?
A) a fluorescent lamp
B) an incandescent lamp
C) a CFL
D) an LED
Surface tension is a direct result of
A) viscosity.
B) Archimedes’ principle.
C) adhesive forces between molecules in a liquid or solid.
D) cohesive forces between molecules in a liquid.
As a ball bounces from a floor, its acceleration off the floor between bounces is
A) significantly less than g.
B) g.
C) slightly more than g.
D) significantly more than g.
When a constant and sustained upward force acts on a rocket, its acceleration increases
mainly because
A) gravity becomes weaker with increased distance.
B) the mass of the rocket decreases as fuel is burned.
C) No way, for acceleration would be constant.
On a balanced seesaw, a boy three times as heavy as his partner sits
A) less than 1/3 the distance from the fulcrum.
B) 1/3 the distance from the fulcrum.
C) more than 1/3 the distance from the fulcrum.
A car’s speed 3 seconds after accelerating from rest at 2 m/s2 is
A) 2 m/s.
B) 3 m/s.
C) 4 m/s.
D) 6 m/s.
When you blow over hot soup to cool it you are helping
A) to slightly increase air pressure atop the soup surface.
B) more energetic particles in the soup to escape.
C) conduction, convection, and radiation.
D) none of the above
Danny Diver weighs 500 N and steps off a diving board 10 m above the water. Danny
hits the water with kinetic energy of
A) 10 J.
B) 500 J.
C) 510 J.
D) 5000 J.
E) more than 5000 J.
When Nellie Newton hangs by the ends of a rope draped over a large pulley, the tension
in each supporting vertical strand is
A) half her weight.
B) equal to her weight.
C) twice her weight.
D) none of the above
According to Einstein’s theory of special relativity
A) space and time are aspects of each other.
B) energy and mass are aspects of each other.
C) both of these
D) neither of these