Mechanics | Relativity Answers

Properties of Materials
A sample material is pulled by a certain force so that an elastic elongation is recorded. What is the ratio of deformation between loaded and unloaded conditions known as?

Pressure and force
A pneumatic ram has a chamber piston diameter of 150 mm and is subjected to a variable source of pressure for actuation. What pressure will be required to produce an actuation force of 2 kN (consider the cylinder to be friction less)

Friction coefficient
The force applied in pulling an object on a smooth surface is gradually increased until the object is just about to slip. Which friction coefficient would apply in this situation?

This question refers to: Laws of motion
A mass of 2 kg travelling at 2 m/s is struck by a mass of 4 kg travelling at 3 m/s. If the coefficient of restitution for the two materials is 0.4, calculate their final velocities.
Give the final velocity value in m/s of the 4kg mass here:

This question refers to: Laws of motion
A mass of 2 kg travelling at 2 m/s is struck by a mass of 4 kg travelling at 3 m/s. If the coefficient of restitution for the two materials is 0.4, calculate their final velocities.
Give the final velocity value in m/s of the 2kg mass here:

This question refers to: Laws of motion
A rubber ball of mass 0.12 kg moving at a speed of 25 m/s perpendicular to a smooth vertical wall, rebounds from the wall without loss of speed in an impact lasting 0.004 s
Calculate the impact force.
Give your answer in Newtons
Tip: consider the change of direction of the velocity before and after impact in your calculation. The answer could be a negative value.

This question refers to: Laws of motion
A rubber ball of mass 0.12 kg moving at a speed of 25 m/s perpendicular to a smooth vertical wall, rebounds from the wall without loss of speed in an impact lasting 0.004 s
Calculate the change of momentum of the ball.
Give your answer in kg.m/s
Tip: consider the change of direction of the velocity before and after impact in your calculation. The answer could be a negative value.

A particle moves along a circle of radius {20/(22/7)} m with constant tangential acceleration. If the speed of the particle is 80m/sec at the end of the second revolution after motion has begun, the tangential acceleration is
(1)160(22/7)
(2)40(22/7)
(3)40
(4)640(22/7)
All are in m/sec^2

A ball of mass m is released from the top of an inclined plane of angle ø. Its strikes a rigid wall at a distance 3l/4 from top elastically. The impulse imparted to ball by rigid wall is
(1) m√3/2gh
(2)m√3gh
(3)2m√3gh
(4)m√6gh
(l= length of hypotenuse of plank)
(h = height of inclined plane)

If the speed of the vehicle increases by 2m/sec. Its kinetic energy is doubled, then original speed of the vehicle is
(1)(2^1/2+1)
(2)2(2^1/2+1)
(3)2(2^1/2+1)
(4)2^1/2(2^1/2+1)