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351: As a pendulum swings from its highest to its lowest point, it has the SMALLEST acceleration when it is:
w) At its lowest point
x) At its highest point
y) At a point 1/3 the distance from the top of its swing
z) At a point 1/2 the distance from the top of its swing.
ANSWER: W -- AT ITS LOWEST POINT
352: Two cars collide head-on. They stop at the point of collision. Both cars must have one of the following. Do they have?
w) Equal masses
x) Equal but opposite velocities before the collision
y) Equal but opposite moments before the collision
ANSWER: Y -- EQUAL BUT OPPOSITE MOMENTA BEFORE THE COLLISION
353: When the speed of a train moving on a circular track is doubled, the centripetal force acting on the train does one of the following. Does the force:
w) Remain the same
x) Increase by a factor of 2
y) Increase by a factor of 4
z) Increase by a factor of 8
ANSWER: Y -- INCREASE BY A FACTOR OF 4
354: It takes 500 watts to operate a machine whose power output is 480 watts. Which of the following is the efficiency of the machine? Is it
w) 20%
x) 48%
y) 96%
z) 98%
ANSWER: Y -- 96%
355: Which of the following statements is TRUE about an ELASTIC collision between two particles? Is it true that:
w) Neither particle loses any of its kinetic energy
x) Neither particle loses any of its momentum
y) The velocity gained by one particle is equal to that lost by the other
z) The total kinetic energy before and after the collision remains constant
ANSWER: Z -- THE TOTAL KINETIC ENERGY BEFORE AND AFTER THE COLLISION RE
356: Ten calories of heat are added to 2 grams of water. The temperature of the water rises to a total of how many degrees? Is it:
w) 2 degrees Celsius
x) 5 degrees Celsius
y) 10 degrees Celsius
z) 20 degrees Celsius
ANSWER: X -- 5 DEGREES CELSIUS
357: If water is warmed from 0 degrees Celsius to 6 degrees Celsius, which of the following things happen. Will the water:
w) Expand steadily
x) Contract steadily
y) Expand at first and then contract
z) Contract first then expand
ANSWER: Z -- CONTRACT FIRST THEN EXPAND
358: A gas at 0 degrees C and at normal atmospheric pressure has a volume of 273 cubic centimeters. If it is held at constant pressure until its volume is doubled, its temperature will be which one of the following? Will it be?
w) 2 degrees Celsius
x) 200 degrees Celsius
y) 273 degrees Celsius
z) 546 degrees Celsius
ANSWER: Y -- 273 DEGREES CELSIUS
359: Infrared rays are absorbed best by which one of the following. Is it:
w) Bodies of air
x) White bodies with rough surfaces
y) Mirrors
z) Black bodies with rough surfaces
ANSWER: Z -- BLACK BODIES WITH ROUGH SURFACES
360: Energy stored in a body as thermal or internal energy consists of one of the following. Does it consist of?
w) Heat in the form of radiant energy
x) Molecular kinetic energy only
y) Molecular potential energy only
z) Both kinetic and potential energy
ANSWER: Z -- BOTH KINETIC AND POTENTIAL ENERGY
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