Physics Test 77

In an atwood machine m­₁ <<< m₂­ then tension in the string will be :

A man holds a thin stick at its two ends and bends it in an arc, like a bow without string. Which of the following correctly shows the directions of the forces exerted by him on the stick (neglect the gravity) :

At given instant, if block A is moving with speed of 2 m/s as shown then magnitude of acceleration of system :

A child weighing 25 kg slide down a rope hanging from the branch of a tall tree. If the force of friction acting against him is 2N, what is the acceleration of the child : (g = 9.8 m/s²)

A particle moving in x-y plane under the action of a force F such that the component of its linear momentum p at any time t are p_x = 2cost, p_y­ = 2sint. the angle between  and  at time t is :

A block kept on a frictionless inclined surface with angle of inclination 60°. The incline is given an acceleration 'a' to keep the block stationary then 'a' is equal to :

A light string passing over a pulley (μ = 0) connect two blocks of masses m₁ and m₂. If acceleration of masses is g/8 then the ratio of masses is

Two masses of 10 kg and 20 kg respectively are connected by a massless spring as shown in the figure. A force of 200 N acts on the 20 kg mass. At the instant shown the 10 kg mass has an acceleration 4 m/s² rightwards. What is the acceleration of 20 kg mass ?

A block is dragged on a smooth plane with the help of a rope which moves with a velocity v as shown in figure. The horizontal velocity of block is :

A vehicle of mass 'm' is moving on a rough horizontal surface with momentum P. If the coefficient of friction between the tyres and road be μ, then the stopping distance is: