Physics Past Questions and Answers

The magnitude of the force required to make an object of mass, m move with speed, v in a circular of radius r is given by the expression

A \(\frac{mr}{v}\)
B \(\frac{mr^2}{v}\)
C \(\frac{mv^2}{r}\)
D \(\frac{mv}{r^2}\)

Question 3042:

A man was moving round a circular path continuously for 4 minutes and covered the following distances in the times stated :
Distance (in metres) 200, 400, 600, 300
Time(in minutes) : 1, 2, 3, 4 respectively. Which of the following statements is correct about the motion of the man?

A The man was moving without uniform velocity
B The speed was changing constantly
C The velocity was uniform
D It was an instance of motion in which both speed and velocity are the same

Question 3043:

A car takes off from rest and covers a distance of 80m on a straight road in 10s. Calculate the magnitude of its acceleration

A 1.25ms^-2
B 1.60ms^-2
C 4.00ms^-2
D 8.00ms^-2

Question 3044:

An object is released from rest at a height of 25m. Calculate the time it takes to fall to the ground. [g = 10ms^-2]

A 25.00s
B 10.00s
C 2.50s
D 2.24s

Question 3045:

An object is acted upon by a system of parallel forces causing the object to be in static equilibrium. Which of the following statements is not correct?

A The resultant of the parallel force is zero
B The algebraic sum of the moment of the forces is zero
C All the parallel forces must be equal in magnitude and in direction
D The sum of the forces in one direction must be equal to the sum of forces in the opposite direction