(Multiple choice)

(1)

If the gauge pressure is doubled, the absolute pressure will be

(a) Halved.

(b) Doubled.

(c) Unchanged.

(d) Squared.

(e) Not enough information is given to determine the effect.

(2)

A rock of mass M with a density twice that of water is sitting on the bottom of an aquarium tank filled with water. The normal force exerted on the rock by the bottom of the tank is

(a) 2Mg.

(b) Mg.

(c) Mg/2.

(d) Zero.

(e) Impossible to determine from the given information.

(3)

A rock is thrown into a swimming pool filled with water of uniform temperature. Which of the following statements is true?

(a) The buoyant force on the rock is zero as it sinks.

(b) The buoyant force on the rock increases as it sinks.

(c) The buoyant force on the rock decreases as it sinks.

(d) The buoyant force on the rock is constant as it sinks.

(e) The buoyant force on the rock as it sinks is nonzero at first but becomes zero once the terminal velocity is reached.

(4)

A 200-g block of lead and a 200-g block of copper rest at the bottom of an aquarium filled with water. Which of the following is true?

(a) The buoy ant force is greater on the lead than on the copper.

(b) The buoyant force is greater on the copper than on the lead.

(c) The buoyant force is the same on both blocks.

(d)More information is needed to choose from the above.

(5)

A 20-cm3 block of lead and a 20-cm3 block of copper rest at the bottom of an aquarium filled with water. Which of the following is true?

(a) The buoy ant force is greater on the lead than on the copper.

(b) The buoyant force is greater on the copper than on the lead.

(c) The buoyant force is the same on both blocks.

(d) More information is needed to choose from the above.

(6)

A horizontal pipe narrows from a diameter of 10 cm to 5 cm. For a fluid flowing from the larger diameter to the smaller,

(a) The velocity and pressure both increase.

(b) The velocity increases and the pressure decreases.

(c) The velocity decreases and the pressure increases.

(d) The velocity and pressure both decrease.

(e) Either the velocity or pressure changes but not both.

(7) True / false

The buoyant force on a submerged object depends on the shape of the object.

(8)

A 0.5-kg mass of lead is submerged in a container filled to the brim with water and a block of wood floats on top. The lead mass is slowly lifted from the container by a thin wire, and as it emerges into air the level of the water in the container drops a bit. The lead mass is now placed on the block of wood, which remains afloat. As the lead is placed on the block of wood,

(a) Some water spills over the edge of the container.

(b) The water level rises exactly to the brim as before.

(c) The water level rises but does not reach the brim of the container.

(d) There is not enough information provided to decide between the three options.