Physics Past Questions and Answers

The diagram above illustrates the velocity-time graph of the motion of a body. Calculate the total distance covered by the body

A 50m
B 65m
C 175m
D 225m
E 300m

Question 477:

A ball of mass 5.0kg hits a smooth vertical wall normally with a speed of 2ms^-1 and rebounds with the same speed. Determine the impulse experienced by the ball

A 20.0kg ms^-1
B 10.0kg ms^-1
C 5.0kg ms^-1
D 1.3kg ms^-1
E 0.0kg ms^-1.

Question 478:

A rocket is launched from the surface of the earth. If the radius of the earth is 6.4 x 10⁶m and the acceleration of free fall due to gravity is 1Oms^-1 calculate the escape velocity of the rocket.

A 2.53 x 10⁴ms^-1
B 1.13 x 10⁴ms
C 8.00 x 10³ms^-1
D 4.23 x 10³ms^-1
E 6.41 x 10⁴ms^-1

Question 479:

The velocity ratio and efficiency of a system of pulleys are 6 and 80% respectively. How much effort is required to lift a load of mass 120kg with this system? (g=10ms^-2)

A 25N
B 90N
C 96N
D 250N
E 960N

Question 480:

Two spanners X and Y of lengths 15cm and 20cm respectively are used in turn to give a screw of pitch 2mm one complete rotation. If Rx and Ry are the respective velocity ratios of the spanners then the ratio Rx : Ry is

A 1 : 50
B 3 : 20
C 3:4
D 4:3
E 20:3