Physics (AS & A Level) · May / June 2023 · Paper 11 · Question 7
9702Momentum and Newton’s laws of motion
A camera drone of mass 1.20 kg hovers at a fixed point above the ground. The drone has four propellers. In a time of 1.00 s, each propeller pushes a mass of 0.400 kg of air vertically downwards. Assume that the air above the propellers is stationary. What is the speed of the air leaving each propeller?
- A0.750 m s⁻¹
- B3.00 m s⁻¹
- C7.36 m s⁻¹
- D29.4 m s⁻¹
As printed in the paper
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Correct answer: C. 7.36 m s⁻¹
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