Physics Chapter 15

You are driving a late model convertible car at the 65 mph speed limit with its soft flexible roof closed up and the windows closed. You observe that the roof

bows outward

As the speed of a moving fluid increases, the pressure in the fluid

decreases

Two compressible solids are formed into spheres of the same size. The bulk modulus of sphere two is twice as large as the bulk modulus of sphere one. You now increase the pressure on both spheres by the same amount. As a result of the increased pressure, how is the change in volume of sphere two (△V2) related to the change in volume of sphere one (ΔV1)?

deltaV2=1/2deltaV1

Water flows through a pipe having a varying width. More water flows per second through the wide section than through the narrow section because there is more room for it to flow.

false

A piece of wood is floating in a bathtub. A second piece of wood sits on top of the first piece, and does not touch the water. If the top piece is taken off and placed in the water, what happens to the water level in the tub?

it does not change

Salt water is more dense than fresh water. A ship floats in both fresh water and salt water. Compared to the fresh water, the volume of salt water displaced by the ship is

less than the volume of fresh water

If you double the pressure on the surface of a can of water, the buoyant force on a stone placed in that water will

not change

A rock is under water in a shallow lake. As the rock sinks deeper and deeper into water, the buoyant force on it

remains constant

At a certain depth in the ocean, the absolute pressure is p. If you go to twice that depth (treating the water as incompressible)

the absolute pressure will be less than 2p

When you blow some air above the upper face of a paper strip, the paper rises. This occurs because

the air above the upper face of the paper moves faster, which makes the pressure lower than at the lower face

Tensile stress is

the applied force per cross-sectional area

A 50-cm3 block of wood is floating partially submerged in water, and a 50-cm3 block of iron is totally submerged in water. Which block has the greater buoyant force on it?

the iron

Diagram: Fluid fills the container shown in the figure. At which of the indicated points is the pressure greatest?

the pressure is the same at each of the labeled points

Tensile train is

the ratio of the change in length to the original length

A cup of water containing an ice cube at 0°C is filled to the brim. The tip of the ice cube sticks out of the surface. As the ice melts, you observe that

the water level remains the same