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प्रश्न
State the law of conservation of momentum.
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उत्तर
The law of conservation of momentum states the total momentum of a system remains unchanged in the absence of any external force.
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संबंधित प्रश्न
Name the physical quantity which is considered to be a measure of the quantity of motion of a body.
state whether momentum is scalar or vector.
Explain the meaning of the following equation : .
p = m x v
where symbols have their usual meanings.
Calculate the momentum of a toy car of mass 200 g moving with a speed of 5 m/s.
What is the change in momentum of a car weighing 1500 kg when its speed increases from 36 km/h to 72 km/h uniformly ?
Calculate the change in momentum of a body weighing 5 kg when its velocity decreases from 20 m/s to 0.20 m/s.
State the relation between the momentum of a body and the force acting on it.
The velocity of a body of mass 10 kg increases from 4 m/s to 8 m/s when a force acts on it for 2 s.
(a) What is the momentum before the force acts ?
(b) What is the momentum after the force acts ?
(c) What is the gain in momentum per second ?
(d) What is the value of the force ?
Name the law involved in the following situation :
the sum of products of masses and velocities of two moving bodies before and after their collision remains the same.
Two blocks P and Q of masses 0.3 kg and 0.4 kg, respectively, are stuck to each other by some weak glue as shown in the figure. They hang together at the end of a spring with a spring constant of k = 200 N/m. The block Q suddenly falls free due to the failure of glue, then the maximum kinetic energy of block P during subsequent motion will be ______ mJ.
