Question 1

A tire of an automobile has a gauge pressure of 30 psi at the top of a mountain,and the air temperature inside the tire is 300 K.The atmospheric pressure at the top of the mountain is 0.7 atm.The car is driven down to sea level,where the atmospheric pressure is 1.0 atm,and the air inside the tire is heated to 350 K.At sea level,assuming no leaks,the gauge pressure of the tire will be

Accepted Answer

According to the ideal gas law, PV = nRT, the gauge pressure inside the tire is directly proportional to the temperature and number of moles of gas inside the tire. When the car drives down to sea level, the atmospheric pressure outside the tire increases from 0.7 atm to 1.0 atm, but the gauge pressure inside the tire does not change because there are no leaks. As the air temperature inside the tire increases from 300 K to 350 K, the gauge pressure inside the tire will increase proportionally. However, since the atmospheric pressure outside the tire is now higher than it was at the top of the mountain, the net gauge pressure inside the tire will decrease. Therefore, the best choice is A) lower.

Question 2

The tires of a car support the weight of a stationary car.If one tire has a slow leak,the air pressure within the tire will _______ with time,the surface area between the tire and the road will ________ with time,and the net force the tire exerts on the road will ___________ with time.

Accepted Answer

As the tire leaks, the air pressure decreases, causing the surface area in contact with the road to increase to support the same weight, while the net force remains constant as it equals the weight of the car.

Question 3

A barge loaded with lumber and iron ore floats in a lock by a dam (a closed pool of water like a big swimming pool).If some of the cargo is thrown overboard,the level of water in the lock will

Accepted Answer

The level of water in the lock will stay the same. The amount of water displaced by the barge is equal to the weight of the barge and its cargo, so throwing some of the cargo overboard will not change the amount of water displaced and therefore will not change the water level. The type of cargo thrown overboard is irrelevant in this case.

Question 4

A spherical ball of lead (density 11.3 g/cm³)is placed in a tub of mercury (density 13.6 g/cm³).Which answer best describes the result?

Accepted Answer

The lead ball will float because its density is less than that of mercury. The fraction of the volume above the surface is determined by the ratio of the densities: (13.6 - 11.3) / 13.6 = 0.17, or 17%.

Question 5

In England in the Middle Ages an extensive system of canals was used for transportation.Some of these canals crossed over canyons by flowing over bridges (viaducts).Suppose that a heavily loaded barge crossed over such a waterway bridge.

Accepted Answer

The answer of In England in the Middle Ages an...

Question 6

Consider a brick that is totally immersed in water.The long edge of the brick is vertical.The pressure on the brick is

Accepted Answer

The pressure in a fluid increases with depth due to the weight of the fluid above. Therefore, the pressure is greatest at the bottom of the brick, which is at the greatest depth.

Question 7

The Bernoulli effect is described by the equation

The origin of this relation is that it is a statement of

Accepted Answer

The Bernoulli effect equation is derived from the conservation of energy for a moving fluid, specifically the conservation of mechanical energy between two points along a streamline. The other choices are not directly related to the Bernoulli effect.

Question 8

A wooden block contains some nails so that its density is exactly equal to that of water.If it is placed in a tank of water and released from rest when it is completely submerged,it will

Accepted Answer

If the density of the wooden block is exactly equal to that of water, then it will not experience any buoyant force and will remain where it is released. This is because the weight of the block and the weight of the water displaced by the block will be exactly equal, resulting in a net force of zero. Therefore, the block will not rise to the surface or sink to the bottom.

Question 9

The Bernoulli effect is responsible for the lift force on an airplane wing.Wings must therefore be designed so as to insure that

Accepted Answer

The Bernoulli effect states that an increase in the speed of a fluid occurs simultaneously with a decrease in pressure. For lift, the wing is designed so that air moves faster over the top surface, creating lower pressure above the wing compared to below, resulting in lift.

Question 10

-In the figure,fluid fills the container shown here.At which of the indicated points is the pressure greatest?

Accepted Answer

The pressure is the same at each of the labeled points because the fluid is at rest and the container is not accelerating.

Question 11

A waitress fills your water glass with ice water (containing many ice cubes)such that the liquid water is perfectly level with the rim of the glass.As the ice melts,

Accepted Answer

As the ice melts, it turns into water that exactly fills the volume previously occupied by the submerged part of the ice, so the water level remains the same.

Quiz 13: Fluids

The tires of a car support the weight of a stationary car.If one tire has a slow leak,the air pressure within the tire will _ with time,the surface area between the tire and the road will with time,and the net force the tire exerts on the road will _____ with time.

A barge loaded with lumber and iron ore floats in a lock by a dam (a closed pool of water like a big swimming pool) .If some of the cargo is thrown overboard,the level of water in the lock will

A spherical ball of lead (density 11.3 g/cm³) is placed in a tub of mercury (density 13.6 g/cm³) .Which answer best describes the result?

In England in the Middle Ages an extensive system of canals was used for transportation.Some of these canals crossed over canyons by flowing over bridges (viaducts) .Suppose that a heavily loaded barge crossed over such a waterway bridge.

Consider a brick that is totally immersed in water.The long edge of the brick is vertical.The pressure on the brick is

The Bernoulli effect is described by the equation The origin of this relation is that it is a statement of

A wooden block contains some nails so that its density is exactly equal to that of water.If it is placed in a tank of water and released from rest when it is completely submerged,it will

The Bernoulli effect is responsible for the lift force on an airplane wing.Wings must therefore be designed so as to insure that

-In the figure,fluid fills the container shown here.At which of the indicated points is the pressure greatest?

A waitress fills your water glass with ice water (containing many ice cubes) such that the liquid water is perfectly level with the rim of the glass.As the ice melts,

Quiz 13: Fluids

The tires of a car support the weight of a stationary car.If one tire has a slow leak,the air pressure within the tire will _______ with time,the surface area between the tire and the road will ________ with time,and the net force the tire exerts on the road will ___________ with time.

A barge loaded with lumber and iron ore floats in a lock by a dam (a closed pool of water like a big swimming pool) .If some of the cargo is thrown overboard,the level of water in the lock will

A spherical ball of lead (density 11.3 g/cm3) is placed in a tub of mercury (density 13.6 g/cm3) .Which answer best describes the result?

In England in the Middle Ages an extensive system of canals was used for transportation.Some of these canals crossed over canyons by flowing over bridges (viaducts) .Suppose that a heavily loaded barge crossed over such a waterway bridge.

Consider a brick that is totally immersed in water.The long edge of the brick is vertical.The pressure on the brick is

The Bernoulli effect is described by the equation The origin of this relation is that it is a statement of

A wooden block contains some nails so that its density is exactly equal to that of water.If it is placed in a tank of water and released from rest when it is completely submerged,it will

The Bernoulli effect is responsible for the lift force on an airplane wing.Wings must therefore be designed so as to insure that

-In the figure,fluid fills the container shown here.At which of the indicated points is the pressure greatest?

A waitress fills your water glass with ice water (containing many ice cubes) such that the liquid water is perfectly level with the rim of the glass.As the ice melts,

The tires of a car support the weight of a stationary car.If one tire has a slow leak,the air pressure within the tire will _ with time,the surface area between the tire and the road will with time,and the net force the tire exerts on the road will _____ with time.

A spherical ball of lead (density 11.3 g/cm³) is placed in a tub of mercury (density 13.6 g/cm³) .Which answer best describes the result?