A wooden object floats in water kept in a beaker. The object is near a side of the beaker (figure 13-Q4). Let P1, P2, P3 be the pressures at the three points A, B and C of the bottom as shown in the figure.
A. P1 = P2 = P3
B. P1 < P2 < P3
C. P1 > P2 > P3
D. P2 = P3 ≠ P1
This is a direct inference from the law that states that pressure is invariable in a horizontal plane or pressure at all points lying in the same horizontal surface is equal. The presence of the cube will not affect the pressure as it exerts the buoyant force on the water equal to the weight of the water displaced.
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The weight of an empty balloon on a spring balance is W1. The weight becomes W2 when the balloon is filled with air. Let the weight of the air itself be ω. Neglect the thickness of the balloon when it is filled with air. Also neglect the difference in the densities of air inside and outside the balloon.HC Verma - Concepts of Physics Part 1
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(a) Pressure decreases as one ascends the atmosphere. If the density of air is ρ, what is the change in pressure dp over a differential height dh?
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(d) This model of the atmosphere works for relatively small distances. Identify the underlying assumption that limits the model.
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HC Verma - Concepts of Physics Part 1