1.8. Pressure
A subsection of Physics, 5054, through 1. Motion, forces and energy
Listing 10 of 156 questions
A very deep tank is used when training sailors to escape from submarines. The tank is cylindrical and open to the air at the top. shows the tank. 32 m water base (not to scale) The area of the base of the tank is 45 m2 and the tank is filled with water to a depth of 32 m. The density of water is 1000 kg / m3 and the gravitational field strength g is 10 N / kg. Calculate the pressure, due to the water, on the base of the tank. pressure = The pressure in the water at the base of the tank is 4.2 × 105 Pa. Explain why the pressure in the water at the base of the tank differs from the value calculated in . Calculate the force exerted on the base of the tank. force = Force is a vector quantity and pressure is a scalar quantity. State how a vector quantity differs from a scalar quantity.
5054_w15_qp_22
THEORY
2015
Paper 2, Variant 2
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A spring is taken from a drawer in a physics laboratory. is the extension-load graph for the spring. 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 extension / cm X load / N Using , determine the load on the spring when its extension is 4.9 cm. load = The point X on is the limit of proportionality for the spring. On , sketch a line to show how the extension-load graph might continue after X. A rectangular, plastic block is suspended from the lower end of the spring. shows that the bottom 3.5 cm of the plastic block is in the water in a beaker. 3.5 cm support spring plastic block water (not to scale) The density of water is 1000 kg / m3 and the gravitational field strength g is 10 N / kg. The base of the plastic block is a square with sides of 4.0 cm. Calculate the pressure due to the water at a depth of 3.5 cm below the surface of the water. pressure = Calculate the upward force on the base of the block due to the pressure of the water. force = In , the extension of the spring is 4.9 cm. Using the answer from and the answer from , determine the weight of the block. weight = In the equipment shown in , the pressure of the atmosphere is transmitted through the water. The total pressure in the water at a depth of 3.5 cm is larger than the pressure due to the water alone. Explain why, in this experiment, atmospheric pressure does not affect the position of the plastic block in the water. Force is a vector quantity and pressure is a scalar quantity. State how a vector quantity differs from a scalar quantity. The beaker in is gradually moved upwards so that more of the plastic block is in the water. Explain what happens to the forces that act on the block.
5054_w16_qp_22
THEORY
2016
Paper 2, Variant 2
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Questions Discovered
156