## A balloon is filled with a certain mass of gas. When the temperature is constant, the pressure P in the balloon is an inverse proportional function of the balloon volume V, and the coordinates of a point are (1.5,64) 1. Write the analytical formula of inverse proportional function 2 when the volume of the balloon is 0.8m3, what is the air pressure in the balloon 3. When the pressure in the balloon is greater than 144 kPa, the balloon will explode. How many cubic meters should the volume of the balloon be?

1.P=96/V

2. P = 96 / 0.8 = 120 kPa

3.96/V=P2/3

That is, the volume of the balloon should not be less than 2 / 3 cubic meters

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The biggest difference between physics and mathematics is that the physical units also need to be calculated. In many problems, the calculation must be unified into international units. Your problem may be to solve the problem in the format of mathematics without the same unit. In this way, if you apply the data in the problem, it must be wrong. You must pay attention to using the standard

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### 1. Use a measuring cylinder, water and a fine needle to measure some physical quantities of wood blocks A. Can only measure the volume of wood blocks? B. Can only measure the buoyancy of the wood block? C. Can only measure the volume, mass and density of wood blocks? D. The volume, buoyancy, mass and density of wood blocks can be measured 2. Put a block into water, in which the block will fall at a uniform speed. If the block is immersed in salt water, the block will eventually () A. Floating B. levitation? C. It's possible to sink to the bottom D

The volume of the first question can be measured. Just press the wood block into the water with a needle. Because the needle is very thin, the volume can be ignored, plus buoyancy, so you should choose D

The second question is because it falls at a uniform speed, so the density of this material is equal to that of water. The density of brine is higher, choose a

### What is the difference between a variable speed bicycle and an ordinary bicycle? concrete!

The most obvious thing is that the appearance is different. In addition, in terms of performance, variable-speed bicycles are more autonomous than ordinary bicycles: 1. If you want to keep fit, you can adjust the performance, strength Speed, etc. 2. If you want to save effort, you can also adjust the position of the gear plate and chain. 3. Another important difference is that the price of variable-speed bicycles under the same brand is higher than that of ordinary bicycles