Mechanics | Relativity Answers

Prove that the motion of a simple pendulum is simple harmonic motion. Also show that the time period of
simple pendulum of very large length is independent of length.

Find an expression for the energy density in terms of stress and strain.

A ball of mass 0.6kg,moving at a velocity of 20m/s is suddenly hit by a force of 10N for a time 0f 0.6s.Find its new velocity of motion.

An object is thrown horizontally from a height of 20 m with velocity 10 m s-1. Find its velocity after 1s
(g = 10 m s-2 )

a piece of copper wire [a=1.7*10^5/degrees celsius] has a length of exactly 50 meters when at a temperature of 120 degrees celsius. what will be the increase in length if its tempurature is rasied to 232

A boat moves through the water with two
forces acting on it. One is a 2.17×103 N
forward push by the motor, and the other is a
1.72×103 N resistive force due to the water.
What is the acceleration of the 1258.6 kg
boat?
Answer in units of m/s
2

Two charged spheres of equal radii when kept at a certain distance attract each other by a force of F. The charges are touched with each other and placed at the same separation again. They now repel each other by a force of F/4. Find the ratio of the charges

A particle of mass2kg is released from rest and slides down a plane inclined at 30 degree to the horizontal . There is a constant resistance force of 4N. Find the speed of the particle after it has travelled 8 meter

A vibrating tuning fork generates a wave given by y=0.1 sin π(0.1x-2t),where x and y are in metre and t is in second.The distance travelled by the wave while the fork completes 30 vibrations is:
a)600m b)36m c)20m d)200m

In analyzing the motion of an elastic wave through a material medium,we often ignore the molecular structur of matter.when is this justified and when is it not?
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