Laws of Motion ...

A rope of length 5 m is kept on frictionless surface and a force of 5 N is applied to one of its end. Find tension inthe rope at lm from this end

A lift is going up. The total mass of the lift and the passenger is 1500 kg. The variation in the speed of the lift is as given in the graph. The tension in the rope pulling the lift at t =11th s will be

In the above question, the height to which the lift takes the passenger is

A body of mass 5 kg is suspended by a spring balance on an inclined plane as shown in figure. The spring balance measure

For ordinary terrestrial experiments, the observer is an inertial frame in the following cases is

A particle of mass 0.3 kg is subjected to a force F = –kx with k = 15 N/m. What will be its initial acceleration if it is released from a point 20 cm away from the origin?

Which of the following quantities measured from different inertial reference frames are same?

Two vehicles, each moving with speed u on the same horizontal straight road, are approaching each other. Wind blows along the road with velocity w. One of these vehicles blows a whistle of frequency f₁. An observer in the other vehicle hears the frequency of the whistle to be f₂. The speed of sound in still air is v. The correct statement(s) is (are)

A solid disc of mass M is just held in air horizontally by throwing 40 stones per sec vertically upwards to strike the disc each with a velocity 6 ms^–1. If the mass of each stone is 0.05 kg. What is the mass of the disc?(g = 10 ms^–2)

If a body of mass m is carried by a lift moving with an upward acceleration a, then the forces acting on the body are (i) the reaction R on the floor of the lift upwards (ii) the weight mg of the body acting vertically downwards. The equation of motion will be given by