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Tag: class-9
A batsman hits a cricket ball which then rolls on level ground. After covering a short distance, the ball comes to rest. The ball slows to a stop because (a) the batsman did not hit the ball hard enough. (b) velocity is proportional to the force exerted on the ball. (c) there is a force on the ball opposing the motion. (d) there is no unbalanced force on the ball, so the ball would want to come to rest.
Class 9
Physics
13/02/2022
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Why is it advised to tie any luggage kept on the roof of a bus with a rope?
Others
Class 9
Physics
13/02/2022
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When a carpet is beaten with a stick, dust comes out of it. Explain.
Class 9
Physics
13/02/2022
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An object experiences a net zero external unbalanced force. Is it possible for the object to be traveling with a non-zero velocity? If yes, state the conditions that must be placed on the magnitude and direction of the velocity. If no, provide a reason.
Class 9
Physics
13/02/2022
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Two objects of masses 100 g and 200 g are moving along the same line and direction with velocities of 2 m s–1 and 1 m s–1, respectively. They collide and after the collision, the first object moves at a velocity of 1.67 ms–1. Determine the velocity of the second object.
Class 9
Physics
13/02/2022
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From a rifle of mass 4 kg, a bullet of mass 50 g is fired with an initial velocity of 35 m s–1 . Calculate the initial recoil velocity of the rifle.
Class 9
Physics
13/02/2022
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If action is always equal to the reaction, explain how a horse can pull a cart?
Class 9
Physics
10/02/2022
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Explain why some of the leaves may get detached from a tree if we vigorously shake its branch.
Class 9
Physics
10/02/2022
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Which of the following has more inertia: (a) a rubber ball and a stone of the same size? (b) a bicycle and a train? (c) a five rupees coin and a one-rupee coin?
Class 9
Physics
10/02/2022
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An artificial satellite is moving in a circular orbit of radius 42250 km. Calculate its speed if it takes 24 hours to revolve around the earth.
Class 9
Physics
Motion
08/02/2022
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State which of the following situations are possible and give an example for each of these:
Motion
Class 9
Physics
08/02/2022
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A ball is gently dropped from a height of 20m. If its velocity increases uniformly at the rate of 10 m/s² , with what velocity will it strike the ground? After what time will it strike the ground?
Class 9
Physics
Motion
06/02/2022
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