Physics Past Questions and Answers

A body of mass 7.5 kg is to be pulled up along a plane which is inclined at 30^o to the horizontal. If the efficiency of the plane is 75%, what is the minimum force required to pull the body up the plane?
(g = 10ms^-1)

A 5.0 N
B 20.0 N
C 50.0 N
D 75.0 N
E 200.0 N

Question 417:

The angular speed of an object describing a circle of radius 4m with a linear constant speed of 10 ms^-1 is

A 40.00 rad s^-1
B 14.00 rad s^-1
C 2.50 rad s^-1
D 1.58 rad s^-1
E 0.40 rad s^-1

Question 418:

At what angle to the horizontal must the nozzle of a machine gun be kept when firing to obtain a maximum horizontal range for the bullets?

A 0.0^o
B 22.5^o
C 30.0^o
D 45. 0^o
E 90.0^o

Question 419:

Which of the following will reduce the frequency of oscillation of a simple pendulum?

A Increasing the mass of the bob
B Decreasing the mass of the bob
C Increasing the length of the string
D Decreasing the length of the string
E Decreasing the amplitude of oscillation

Question 420:

A car travelling at a uniform speed of 120km h^-1 passes two stations in 4 minutes. Calculate the distance between the two stations.

A 8km
B 15km
C 22km
D 30km
E 60km