An external force of 20 N acts at an angle of `60^(@)`, with the normal to the surface of a square plate having each side of length 20 cm. What is the stress produced in the plate ?

An external force of 20 N acts normally on a rectangular plate of length 20 cm and breadth 10 cm. What is the maximum stress produced in the plate ?

An external force of 10 newton acts normally on a square area of each side 50 cm. The stress produced in equilibrium state is

An external force of 10 newton acts normally on a square area of each side 50 cm. The stress produced in equilibrium state is

Two forces each of magnitude 2N, act at an angle of 60^(@) . What is the magnitude of the resultant force ?

A light ray is incident at an angle of 45^(@) with the normal to a 4 cm thick plate (u = 2.0). Find the shift in the path of the light as it emerges out from the plate.

A light ray is incident at an angle of 45^@ with the normal to a sqrt2 cm thick plate (mu=2.0) . Find the shift in the path of the light as it emerges out from the plate.

A light ray is incident at an angle of 45^@ with the normal to a 2cm thick plate (mu=2.0) . Find the shift in the path of the light as it emerges out from the plate.

A light ray is incident at an angle of 45^@ with the normal to a sqrt2 cm thick plate (mu=2.0) . Find the shift in the path of the light as it emerges out from the plate.

Two plates of equal areas are placed in contact wih each other. Their thickness are 2.0 cm and 5.0 cm respectively. The temperature of the external surface of the first plate is -20^(@)C and that of the external surface of the second plate is 20^(@)C . What will be the temperature of the current surface if the plates (i) are of the same material, (ii) have thermal conductivities in the ratio 2:5 .