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atmosphere

N / m

Pascal

mm of mercury

Well, I would say it's N/m, but I thought it would not hurt to check.

2. When atmospheric pressure increases, what would hapen to the absolute presure at the bottom of a pool? (Points: 1)

It does not change.

It increases by a lesser amount.

It increases by the same amount.

It increases by a greater amount.

It should increase by the same amount, due to Pascal's principle.

3. Salt water is more dense than fresh water. A ship floats in both fresh water and salt water. Compared to the freshwater, the volume of water displaced in the salt water is (Points: 1)

more.

less.

the same.

cannot be determined from the information given.

I would say it is less, since it is more dense.

4. An ideal fluid flows at 12 m/s in a horizonal pipe. If the pipe widens to twice its original radius, what is the fluid flow in the wider section. (Points: 1)

12 m/s

6.0 m/s

4.0 m/s

3.0 m/s

Do we use: R=v x A ? If so, the answer is 3.0? I am a bit confused here...

5. A person weighing 900 N is standing on snowshoes. Each snowshoe has area of 2500 cm2 . What is the pressure on the snow? (Points: 1)

450 N/m2

900 N/m2

1800 N/m2

3600 N/m2

I have use the equation P=F/A and found the answer to be 3600.

6. In a hydraulic garage lift, the small piston has a radius of 5.0 cm and the large piston has a raduis of 15 cm. What force must be applied on the small piston in order to lift a car weighing 20,000 N on the large piston. (Points: 1)

6.7 x 103 N

5.0 x 103 N

2.9 x 103 N

2.2 x 103 N

I have no idea... Please help me...

Thanks!