Question 1
A hydraulic lift raises a 2 000-kg automobile when a 500-N force is applied to the smaller piston. If the smaller piston has an area of 10 cm2, what is the cross-sectional area of the larger piston?
◦
40 cm2
◦
80 cm2
◦
196 cm2
◦
392 cm2
◦
160 cm2
Question 2
A large water storage container is filled to a depth of 3.0 m. The volume above the water is filled with air. In order to pump the water from the container, the air pressure in the container is increased by 3.0
10
5 N/m
2. What happens to the pressure in the water at a depth of 1.0 m when the air pressure is increased?
◦
Nothing, it is still at a depth of 1.0 m and the pressure in the water depends only on the depth.
◦
It increases by 1.0
10
5 N/m
2, since it is at 1/3 the depth of the water.
◦
It increases by 2.0
10
5 N/m
2, since it is at 2/3 the depth from the bottom of the container.
◦
It increases by 3.0
10
5 N/m
2.
◦
It increases by 3.0
10
5 N/m
2 + 9.8
10
3 N/m
2 since it is 1.0 m deep in the water.
The movement of air and water in sandy soil.
Changes in cell shape due to alterations in intracellular fluid volume.
Large Skipper
The large intestine.
Water Molecule
Water strider (Gerris remigis) on water surface, showing surface tension.