Mechanics | Relativity Answers

A man is riding on a cycle with velocity 7.2 km/hr up a hill having a slope 1 in 20. The total mass of the man and cycle is 100kg. The power of the man is
(1)200
(2)175
(3)125
(4)98
All are in W.

A body of mass 3 kg is under the the force, which causes displacement in it is given by S=t^3/3 (in m). Find the work done by the force in first 2 sec.
(1)2
(2)3.8
(3)5.2
(4)24
All are in joules

A ball is thrown at an angle of 15° to the horizontal with an initial velocity of 20 m/s.

A light string passes over a frictionless pulley. To one of its ends a mass of 6 kg is attached. To its other end a mass of 10 kg is attached. Find tension of the string.

Three blacks of masses 6kg, 4kg, 10kg are connected by mass less string on a frictionless table. They are pulled with a force T3 = 40N, Find T2.

A force of 20N is pushing two blocks horizontally along a frictionless floor. What is the force that the B block exerts on A block mass of A are 8 kg and 2 kg respectively.

The period T (time for one complete oscillation) for a simple pendulum is related to the length l of the pendulum by the relationship T = 2π√l/g where g is the acceleration of free fall. Find,
a) What apparatus you need to perform this experiment.
b) Explain the theory, readings and the graph to be drawn to find g.
c) Explain the procedure of the experiment.
d) What steps have to be taken to minimize the errors of the experiment?

A ball of mass 0.5kg moving horizontally with a velocity of 30 m/s strikes a vertical wall and rebounds horizontally with a velocity of 20 m/s. Calculate the impulse (Ft) exerted by the wall on the ball and the fore acting if thee time of contact of the ball is 0.045s.

An object of mass 10 kg falling from a height of 20 m on to a hard floor rebounds to a height of 5m. If the time during which the object was in intact with the ground is 0.004s what was the force exported by the object on the ground?

An object which at rest at a height 10m above the ground, falls on the ground and penetrates 25 cm in to the ground. If the ground resistance four is 1kN, calculate the mass of the object.