Q. If a number of forces are acting at a point, their resultant is given by

View solution

Q. A force acting in the opposite direction to the motion of the body is called force of friction.

View solution

Q. Joule is the unit of

View solution

Q. A spherical body is symmetrical about its perpendicular axis. According to Routh's rule, the moment of inertia of a body about an axis passing through its centre of gravity is(where, M = Mass of the body, and S = Sum of the squares of the two semi-axes.)

View solution

Q. The three forces of 100 N, 200 N and 300 N have their lines of action parallel to each other but act in the opposite directions. These forces are known as

View solution

Q. The efficiency of a lifting machine is the ratio of

View solution

Q. If the efficiency of a lifting machine is kept constant, its velocity ratio is __________ propotional to its mechanical advantage.

View solution

Q. Non-coplaner non-concurrent forces are those forces which

View solution

Q. The forces which meet at one point, but their lines of action __________ on the same plane, are Known as non-coplaner concurrent forces.

View solution

Q. A force while acting on a body may

View solution

Q. A screw jack used for lifting the loads is

View solution

Q. The wheels of a moving car possess

View solution

Q. In order to determine the effects of a force, acting on a body, we must know

View solution

Q. The negative acceleration is called retardation.

View solution

Q. The maximum displacement of a body, from its mean position is called amplitude.

View solution

Q. A lifting machine lifts a load of 1000N through a distance of 0.2 m by means of an effort of 200N through a distance of 1m. This machine is an ideal one.

View solution

Q. The cartesian equation of trajectory is(where u = Velocity of projection, α = Angle of projection, and x, y = Co-ordinates of any point on the trajectory after t seconds.)

View solution

Q. In collision of elastic bodies, the coefficient of restitution is the ratio of the relative velocity after impact to the relative velocity before impact.

View solution

Q. The acceleration of a particle moving with simple harmonic motion is proportional to the displacement of the particle from the mean position.

View solution

Q. The unit of moment of inertia of an area is

View solution