Chpt. 13 HW

Consider the set of tubes shown in the figure. Each tube contains an unknown fluid that is less dense than the water it floats on top of. Rank the four unknown fluids from least dense to most dense.

A C, B, D

Rank, from smallest to largest, the pressures in the tank of motionless fluid shown in the figure.

A, B C D, E, F (Pressure depends on vertical distance from the fluid surface. As we descend deeper in the fluid, the pressure increases.)

When Dr. Hewitt immerses the object in water, how does the loss of weight of the object compare with the buoyant force of the water? a) Loss of weight is equal to the buoyant force. b) Loss of weight is greater than the buoyant force. c) Loss of weight is less than the buoyant force.

a) Loss of weight is equal to the buoyant force.

Suppose you increase the depth of the object WITHOUT changing its height. What will happen to the force due to pressure on the bottom of the object? a) The force due to pressure on the bottom of the object will increase. b) The force due to pressure on the bottom of the object will decrease. c) The force due to pressure on the bottom of the object will stay the same.

a) The force due to pressure on the bottom of the object will increase.

Suppose you increase the depth of the object WITHOUT changing its height. What will happen to the net buoyant force? a) The net buoyant force will stay the same. b) The net buoyant force will increase. c) The net buoyant force will decrease.

a) The net buoyant force will stay the same.

If an object suspended by a scale shows a weight of 3 N in air, and 2 N when submerged in water, the buoyant force on the submerged object is __________. a) 2 N b) 1 N c) more than 3 N d) 3 N

b) 1 N

How much air must a 100-ton blimp displace to float and neither rise nor sink? a)Its volume of air b) 100 tons c) 10,000 tons d) 10 tons

b) 100 tons

Suppose you increase the height of the object WITHOUT changing its depth under water. What will happen to the force due to pressure on the bottom of the object? a) The force due to pressure on the bottom of the object will decrease. b) The force due to pressure on the bottom of the object will increase. c) The force due to pressure on the bottom of the object will stay the same.

b) The force due to pressure on the bottom of the object will increase.

What happens to the pressure in all parts of a confined fluid if the pressure in one part is increased? a) The pressure everywhere increases by different amounts depending on the area of each part. b) The pressure everywhere increases by the same amount. c) The pressure everywhere decreases to conserve total pressure. d) The pressure in the other parts remains the same.

b) The pressure everywhere increases by the same amount.

How does the water pressure 1 m below the surface of a small pond compare with the water pressure 1 m below the surface of a huge lake? a) The pressure will be zero in both cases. b) The pressure will be the same. c) The pressure will be greater. d) The pressure will be less.

b) The pressure will be the same. (The pressure will be the same. P doesn't depend on volume, but depth)

What is the buoyant force that acts on a submerged object equal to? a) The buoyant force is equal to the weight of the object submerged. b) The buoyant force is equal to both the weight of the fluid displaced and the weight of the object. c) The buoyant force is equal to the weight of the fluid displaced by the submerged object.

c) The buoyant force is equal to the weight of the fluid displaced by the submerged object.

Suppose you increase the height of the object WITHOUT changing its depth under water. What will happen to the net buoyant force? a) The net buoyant force will decrease. b) The net buoyant force stays the same. c) The net buoyant force will increase.

c) The net buoyant force will increase.

When Dr. Hewitt immerses an object in water the second time and catches the water that is displaced by the object, how does the weight lost by the object compare to the weight of the water displaced? a) The weight loss of the object is greater than the weight of the water displaced. b) The weight loss of the object is less than the weight of the water displaced. c) The weight loss of the object is equal to the weight of the water displaced.

c) The weight loss of the object is equal to the weight of the water displaced.

On what factors does the buoyant force acting on an object depend? a) both height of the object and depth under water b) depth under water c) height of the object

c) height of the object

What will these objects do in water: an object denser than water, an object less dense than water, an object that has the same density as water. a) Sink, float, sink b) Float, sink, float c) Float, sink, neither float nor sink d) Sink, float, neither float nor sink

d) Sink, float, neither float nor sink

How does the volume of a completely submerged object compare with the volume of water displaced? a) The volume of the submerged object is less than the volume of displaced water. b) The volumes of both add to zero. c) The volume of the submerged object is greater than the volume of displaced water. d) The volumes are equal.

d) The volumes are equal (submerged stone displaces an amount of water equal to its own volume)