An electric string of length l is elastically stretched through a length e by a force F. The area of cross- section of the string is A and its Young’s modulus is E. Which of the following expressions is correct?
A body moves along a circular path with uniform angular speed of 0.6 rad s-1 and at a constant speed of 3.0ms-1. Calculate the acceleration of the body towards the centre of the circle.
A body timed 20 oscillations of a certain pendulum three times and obtained 44.3s, 45.5s and 45.7s respectively. Calculate the mean period of oscillation of the pendulum
