Class 11th

The position x of a particle of mass 2 kg moving along straight line is given as x = (t – 2)2, where t is in second and x is in metre. The work done by the force in first 2 s is

In case of horse pulling a cart, the force that causes the horse to move forward is the force that

If length of stretched string is increased by 50% keeping mass per unit length same, then in order to keep its frequency of vibration constant, its tension must be increased by

Two balls each of mass 1 kg moving in opposite directions with speed 15 m/s collides and rebounds with the same speed. The magnitude of impulse imparted to each ball due to other is

The correct graph between loge^R and loge(θ– θ₀) during cooling of a body may be (R is the rate of cooling and q0 is surrounding temperature)

If force (F), mass (M), length (L) are taken as fundamental quantities, dimensions of time will be

A body possesses kinetic energy x, moving on a rough horizontal surface, is stopped in a distance y. The friction force exerted on the body is

The kinetic energy of a body varies directly as square of time elapsed. The force acting varies directly as

The velocity of liquid coming out of a small hole of a large vessel containing two different liquids shown in figure is

What is surface tension in fluid mechanics?