None of these
P = R
Q = R
P = Q

## Applied Mechanics and Graphic Statics The angle of friction is:

The angle between the normal reaction and the resultant of normal reaction and limiting friction
The force of friction at which the body is just about to move
The force of friction when the body is in motion
The ratio of the friction and the normal reaction

## Applied Mechanics and Graphic Statics One end of an elastic string of natural length ‘l’ and modulus ‘X’ is kept fixed while to the other end is attached a particle of mass m which is hanging freely under gravity. The particle is pulled down vertically through a distance ‘x’, held at rest and then released.The motion is

None of these
A damped oscillatory motion
A rectilinear motion with constant speed
A simple harmonic motion

M’^T’
M’L-‘T1
M’L-‘T0
M2L’T3

## Applied Mechanics and Graphic Statics A square hole is punched out of a circular lamina, the diagonal of the square being the radius of the circle. If ‘r’ is the radius of the circle, the C.G. of the remainder from the corner of the square on the circumference will be

[r (π - 0.5)]/(π + 0.25)
[r (π - 0.25)]/(π - 0.5)
[r (π + 0.25)]/(π - 0.5)
[r (π + 0.25)]/(π + 0.5)

Q/P
P/Q
P + Q
P - Q