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Which physical quantity is equal to the rate of change of momentum? A - NSC Physical Sciences - Question 1 - 2019 - Paper 1
Question 1
Which physical quantity is equal to the rate of change of momentum? A. Mass B. Impulse C. Net force D. Acceleration The gravitational acceleration on the surfac... show full transcript
Worked Solution & Example Answer:Which physical quantity is equal to the rate of change of momentum? A - NSC Physical Sciences - Question 1 - 2019 - Paper 1
Step 1
Which physical quantity is equal to the rate of change of momentum?
Answer
The quantity that is equal to the rate of change of momentum is Impulse. Impulse is defined as the product of the force and the time duration over which it acts, and it represents the change in momentum of an object. Thus, the correct answer is C.
Step 2
The gravitational acceleration at a height of 2R above the surface of the same planet is ...
Answer
To calculate the gravitational acceleration at a height of , we use the formula for gravitational acceleration:
g_h = rac{g}{(1 + rac{h}{R})^2}
where . Therefore:
g_h = rac{g}{(1 + 2)^2} = rac{g}{9}
Hence, the answer is rac{g}{9}, which corresponds to A.
Step 3
Which ONE of the physical quantities associated with the ball during the fall remains constant?
Answer
When a ball falls, the only physical quantity that remains constant is Weight. Weight is given by the formula:
where is the mass of the ball and is the gravitational acceleration, both of which do not change during the fall. Other quantities like momentum, kinetic energy, and gravitational potential energy will vary as it falls. Hence, the answer is A.