Physics (AS & A Level) · May / June 2018 · Paper 12 · Question 12
A cylindrical block of wood has cross-sectional area A and weight W. It is totally immersed in water with its axis vertical. The block experiences pressures pₜ and p_b at its top and bottom surfaces respectively. Which expression is equal to the upthrust on the block?
- A(p_b – pₜ)
- B(p_b – pₜ)A
- C(p_b – pₜ)A – W
- D(p_b – pₜ)A + W
As printed in the paper
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Correct answer: B. (p_b – pₜ)A
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