Physics Past Questions and Answers

Which of the following quantities are scalars? i. Electrical potential ii. Torque iii. Momentum iv. Kinetic energy

A Ii and iii only
B I and ii only
C Iii and iv only
D I and iv only

Question 472:

When taking a penalty kick, a footballer applies a force of 30.0N for a period of 0.05s. if the mass of the ball is 0.075kg, calculate the speed with which the ball moves off.

A 4.50ms-1
B 11.25ms-1
C 20.00ms-1
D 45.00ms-1

Question 473:

A particle starts from rest and moves with a constant acceleration of 0.5ms-2. The distance covered by the particle in 10s is

A 2.5m
B 5.0m
C 25.0m
D 50.0m

Question 474:

A 20-toothed gear wheel drives a 60-toothed one. If the angular speed of the smaller wheel is 120 rev s-1, the angular speed of the larger wheel is

A 3 rev s-1
B 40 rev s-1
C 360 rev s-1
D 2400 rev s-1

Question 475:

How long will it take a 60kg man to climb a height of 22m if he expended energy at a rate of 0.25kW. [g = ms-2]

A 5.3s
B 34.5s
C 41.6s
D 52.8s