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BidishaKashayap1333
@bidishakashayap1333
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Joined: Oct 11, 2021
Last seen: Jul 27, 2023
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Topics: 2174 / Replies: 0
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Topic
State the Kepler’s law which is represented by the relation r^3 ∝ T^2.
4 years ago
Forum
Gravitation
Replies: 0
Views: 119
Topic
Name the scientist who explained the motion of planets on the basis of gravitational force between the sun and planets.
4 years ago
Forum
Gravitation
Replies: 0
Views: 202
Topic
Name the scientist who gave the three laws of planetary motion.
4 years ago
Forum
Gravitation
Replies: 0
Views: 70
Topic
Does the acceleration produced in a freely falling body depend on the mass of the body?
4 years ago
Forum
Gravitation
Replies: 0
Views: 170
Topic
Which force is responsible for the moon revolving round the earth?
4 years ago
Forum
Gravitation
Replies: 0
Views: 190
Topic
What is the value of gravitational constant G (i) on the earth, and (ii) on the moon?
4 years ago
Forum
Gravitation
Replies: 0
Views: 242
Topic
A man wearing a bullet-proof vest stands still on roller skates. The total mass is 80 kg. A bullet of mass 20 grams is fired at 400 m/s. It is stopped by the vest and falls to the ground. What is then the velocity of the man?
4 years ago
Forum
Force and Laws of Motion
Replies: 0
Views: 261
Topic
A heavy car A of mass 2000 kg travelling at 10 m/s has a head-on collision with a sports car B of mass 500 kg. If both cars stop dead on colliding, what was the velocity of car B?
4 years ago
Forum
Force and Laws of Motion
Replies: 0
Views: 244
Topic
A ball X of mass 1 kg travelling at 2 m/s has a head-on collision with an identical ball Y at rest. X stops and Y moves off. Calculate the velocity of Y after the collision.
4 years ago
Forum
Force and Laws of Motion
Replies: 0
Views: 318
Topic
A truck of mass 500 kg moving at 4 m/s collides with another truck of mass 1500 kg moving in the same direction at 2 m/s.
4 years ago
Forum
Force and Laws of Motion
Replies: 0
Views: 358
Topic
A girl of mass 50 kg jumps out of a rowing boat of mass 300 kg on to the bank, with a horizontal velocity of 3 m/s. With what velocity does the boat begin to move backwards?
4 years ago
Forum
Force and Laws of Motion
Replies: 0
Views: 191
Topic
A boy of mass 50 kg running at 5 m/s jumps on to a 20 kg trolley travelling in the same direction at 1.5 m/s. What is their common velocity?
4 years ago
Forum
Force and Laws of Motion
Replies: 0
Views: 114
Topic
Explain why it is possible for a small animal to fall from a considerable height without any injury being caused when it reaches the ground.
4 years ago
Forum
Force and Laws of Motion
Replies: 0
Views: 147
Topic
Why would an aircraft be unable to fly on the moon?
4 years ago
Forum
Force and Laws of Motion
Replies: 0
Views: 253
Topic
The troops (soldiers) equipped to be dropped by parachutes from an aircraft are called paratroopers. Why do paratroopers roll on landing?
4 years ago
Forum
Force and Laws of Motion
Replies: 0
Views: 303
Topic
Why are car seat-belts designed to stretch some what in a collision?
4 years ago
Forum
Force and Laws of Motion
Replies: 0
Views: 227
Topic
If a balloon filled with air and its mouth untied/ is released with its mouth in the downward direction, it moves upwards. Why? (b) An unloaded truck weighing 2000 kg has a maximum acceleration of 0.5 m/s^2.
4 years ago
Forum
Force and Laws of Motion
Replies: 0
Views: 119
Topic
State the law of conservation of momentum. (b) Discuss the conservation of momentum in each of the following cases: (i) a rocket taking off from ground. (ii) flying of a jet aeroplane.
4 years ago
Forum
Force and Laws of Motion
Replies: 0
Views: 128
Topic
State Newton’s third law of motion and give two examples to illustrate the law. (b) Explain why, when a fireman directs a powerful stream of water on a fire from a hose pipe, the hose pipe tends to go backward.
4 years ago
Forum
Force and Laws of Motion
Replies: 0
Views: 213
Topic
Explain why, a cricket player moves his hands backwards while catching a fast cricket ball. (b) A 150 g ball, travelling at 30 m/s, strikes the palm of a player’s hand and is stopped in 0.05 seconds.
4 years ago
Forum
Force and Laws of Motion
Replies: 0
Views: 105
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