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The bottom area of a cone-shaped beaker is 100cm2. When the beaker is filled with water, the height from the water surface to the bottom of the beaker is 10cm, and the pressure on the table is 0 The bottom area of a cone-shaped beaker is 100cm2. When it is full of water, the height from the water surface to the bottom of the beaker is 10cm, and the pressure on the table is 780p. Now a metal block is suspended by a spring dynamometer, and it is gently immersed in the water. When it is completely immersed, the indication of the spring dynamometer is 4.7n, and then the metal block is slowly taken out, and the pressure of the beaker on the table is reduced to 720p 1. Is there any change in the pressure of water on the bottom of the cup before and after the metal block is immersed in water? How much P is each? 2. If we know that P iron = 7.9g/cm3, P copper = 8.9g/cm3, p aluminum = 2.7, P cast iron = 7, what kind of metal is the metal block made of?
1. There is a change. It's easy to get the change before and after, that is, the change of table top pressure 70p, because the pressure is related to the pressure, and the change of pressure is proportional to the pressure. When the water decreases, the change of pressure on the bottom of the cup is the same as that on the table top, so the change of pressure is also the same
2. The pressure change P = 60, so the height of falling water is h. There is p water * g * H = 60p, so h = 0.006m
The volume is v = s * H = 60cm3, because the gravity of iron block is 4.7n, so the mass is 0.47kg = 470g, so the density p = 470 / 60 is about 7.9g/cm3, so it is iron
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