Two bodies of equal mass are moving in circular paths at equal speed.The first body moves in a circle whose radius is twice as great as that of the second. The ratio of the centripetal or radial acceleration of the first body to that of the second is:

Q.1;  Two bodies of equal mass are moving in circular paths at equal speed.The first body moves in a circle whose radius is twice as great as that of the second. The ratio of the centripetal or radial acceleration of the first body to that of the second is:

1) 1 to 4
2) 1 to 3
3) 1 to 2
4) 1 to 1
ANSWER: 3 -- 1 TO 2

Q.2; A force applied to a rocket gives it an upward acceleration equal to 2 times the acceleration of gravity. The magnitude of the force is equal to:

1) the weight of the rocket
2) twice the weight of the rocket
3) three times the weight of the rocket
4) four times the weight of the rocket
ANSWER: 3 -- THREE TIMES THE WEIGHT OF THE ROCKET

Q.3; A satellite is observed to move in a circle about the earth at a constant speed. This means that the force acting upon it is:

1) zero
2) parallel to the direction of the satellite's instantaneous velocity
3) perpendicular to the direction of the satellite's instantaneous velocity
4) none of the above
ANSWER: 3 -- PERPENDICULAR TO THE INSTANTANEOUS DIRECTION OF
THE SATTELITE’S VELOCITY

Q.4; When a person stands on a scale in an elevator at rest, the scale reads 800 newtons. When the elevator is allowed to fall freely with acceleration of gravity, the scale reads one of the following. Does the scale read:

1) 1600 newtons
2) 800 newtons
3) 400 newtons
4) 0 newtons
ANSWER: 4 -- 0 NEWTONS

Q.5; A 10,000-watt motor operates an elevator weighing 5000 newtons.
Assuming no frictional losses, how high is the elevator raised in 10 seconds. Is it raised:

1) 2 meters
2) 20 meters
3) 50 meters
4) 100 meters
ANSWER: 2 -- 20 METERS

Q.6; A machine's output is 4000 joules and its frictional losses are 1000 joules. Which of the following is its efficiency? Is it:

1) 25%
2) 30%
3) 75%
4) 80%
ANSWER: 4 -- 80%

Q.7; A machine having an efficiency of 50% does 500 joules of work. Which of the following is the work input? Is it:

1) 500 joules
2) 250 joules
3) 1000 joules
4) 2500 joules
ANSWER: 3 -- 1000 JOULES

Q.8;: The relationship between kinetic energy and the potential energy of a swinging pendulum bob is one of the following. Is it:

1) kinetic energy is greater than potential energy
2) kinetic energy is less than potential energy
3) kinetic energy is equal to potential energy
4) kinetic energy plus potential energy equals a constant
ANSWER: 4 -- KINETIC ENERGY PLUS POTENTIAL ENERGY EQUALS A
CONSTANT