Two masses of 9 g and 6 g are connected with a string which is passing over a frictionless pulley. Then common acceleration is
Options
(a) 1.96 cm/sec² (b) 48 cm /sec² (c) […]
A rocket with a lift-off mass 3.5 x 10⁴ kg is blasted upwards with an initial acceleration of 10 m/s². The initial thrust of the blast is
Options
(a) 1.75 x 10⁵ N […]
A 1 kg particle strikes a wall with velocity 1 m/s at an angle 30° and reflects at the same angle. If it remains contact with wall for 0.1 sec, then the force is
A body of mass 2 kg is kept by pressing to a vertical wall by a force of 100 N. The coefficient of static friction between wall and body is 0.3. Then the frictional force […]
A block of 2 kg is kept on the floor. The coefficient of static friction is 0.4. If a force F of 2.5 newton is applied on the block, the frictional force between the block […]
If rope of lift breaks suddenly, the tension exerted by the surface of the lift (a = Acceleration of lift) is
Options
(a) mg (b) m(g+a) (c) zero (d) m(g-a)
Correct Answer:
zero
Explanation: […]
What determines the nature of the path followed by the particle?
Options
(a) Speed (b) Velocity (c) Acceleration (d) Both (b) and (c)
Correct Answer:
Both (b) and (c)
Explanation:
No explanation available. […]
A boat of mass 40 kg is at rest.A dog of mass 4 kg moves in the boat with a velocity of 10 ms⁻¹.What is the velocity of boat?
Options
(a) 4 ms⁻¹ […]
A machine gun fires 10 bullets/s, each of mass 10g, the speed of each bullet is 20 cms⁻¹, then force of recoil is
Options
(a) 200 dyne (b) 2000 dyne (c) 20 dyne (d) […]
A body of mass 0.25 kg is projected with muzzle velocity 100 m/s from a tank of mass 100 kg.What is the velocity of the tank?
Options
(a) 5 m/s (b) 25 m/s […]
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