浮力测(国外英文资料).doc

浮力测(国外英文资料) Buoyancy tests.Txt mens promises like the teeth of a 80 year old woman, rarely real. When you smoke, only three kinds of people will be happy, doctor, your enemy and cigarette seller. Buoyancy test in Physics First, the multiple-choice question 1. a crude test tube and a thin test tube contain some sand. The total weight of the two is equal, and the bottom of the test tube is flat. They are all vertical and motionless floating on the water surface. Of the two test tubes, the following is true A. the volume of boiling water is equal, B. water is equal to the pressure at the bottom of the pipe C. water is equal to the pressure at the bottom of the pipe, and D. is equal to the buoyancy of the pipe 2. there is a wooden bucket floating in the tank. There are stones in the barrel, as shown in figure 1. If you pick out the stones from the barrel and throw them into the pool, the surface of the pool will be () A. rise, B. fall, C. unchanged, D. condition is insufficient, can not be determined 3. as shown in Figure 2, in a container filled with a part of the surface of mercury in mercury, a floating ball. If in the container and then gently injected a certain amount of water, then the ball relative to the original position (to) A. rises, B. decreases, C. does not rise, nor does it fall. D. cannot tell 4., a hydrometer floating in water, the buoyancy is F1, immersed in water under the volume of V1; if it is immersed in kerosene, the buoyancy is F2, immersed in kerosene volume is V2. Comparing the F1 with F2 and V1 and V2, the correct result is () A.F1=F2, V1 = V2, B.F1=F2, V1V2, C.F1F2, V1V2, D.F1F2, V1V2 5. standard milk density is 1.03 g / cm 3, red in a uniform straight pole end winding a fine wire, made into a simple hydrometer to measure the density of milk. The simple gravity meter into the water, submerged in water wood 12.2 cm long; put in the milk when immersed in milk in the wood is 12 cm long, measured the density of milk () A. standard, P = milk 1.03