Waec Physics 1997 Past Questions and Answers

Question 1:

• WAEC 1997

An object of mass 0.40 kg attached to the end of a string is whirled around in a horizontal circle of radius 2.0m with a constant speed of 8\(ms^{-1}\). Calculate the angular velocity of the object

A. 0.8rad\(s^{-1}\)
B. 2 rad\(s^{-1}\)
C. 4 rad\(s^{-1}\)
D. 8 rad\(s^{-1}\)
E. 16 rad\(s^{-1}\)

Question 2:

• WAEC 1997

An object of mass 0.40 kg attached to the end of a string is whirled around in a horizontal circle of radius 2.0m with a constant speed of 8\(ms^{-1}\). Calculate the angular velocity of the object

A. 0.8rad\(s^{-1}\)
B. 2 rad\(s^{-1}\)
C. 4 rad\(s^{-1}\)
D. 8 rad\(s^{-1}\)
E. 16 rad\(s^{-1}\)

Question 3:

• WAEC 1997

An object falls freely from a height of 25m onto the roof a building 5m high. Calculate the velocity with which the object strikes the roof (g=10\(ms^{-2}\)

A. 17.3\(ms^{-2}\)
B. 20\(ms^{-2}\)
C. 24.5\(ms^{-2}\)
D. 125\(ms^{-2}\)
E. 200\(ms^{-2}\)

Question 4:

• WAEC 1997

A ball of mass 0.1kg approaching a tennis player with a velocity of 10ms\(^{-1}\),is hit back in the opposite direction with a velocity of 15ms\(^{-1}\). If the time of impact between the racket and the ball is 0.01s, calculate the magnitude of the force with which the ball is hit

A. 5000N
B. 500N
C. 250N
D. 50N
E. 25N

Question 5:

• WAEC 1997

Two blocks of the same dimension, one steel and the other wooden are dropped simultaneously from the same height. If they fall freely neglecting air resistance the

A. Two blocks hit the ground simultaneously because they have the same acceleration
B. Two blocks reach the ground at the same time because their dimensions are the same
C. Wooden block being lighter than the steel block reaches the ground first
D. Steel block reaches the ground first because it is denser than the wooden block
E. Steel block takes half as much time as the wooden block to reach the ground because it is more massive than the wooden block