Physics (AS & A Level) · Feb / March 2024 · Paper 12 · Question 10
A ball falls through a liquid at a constant speed. It is acted upon by three forces: an upthrust, a drag force and its weight. The liquid has a uniform density. Which statement is correct?
- AThe drag force increases with increasing depth.
- BThe drag force is equal to the sum of the upthrust and weight.
- CThe upthrust is constant with increasing depth.
- DThe weight is greater than the sum of the drag force and the upthrust.
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Correct answer: C. The upthrust is constant with increasing depth.
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