Question 1

A bucket of water is pushed from left to right with increasing speed across a horizontal surface.Consider the pressure at two points at the same level in the water.

Accepted Answer

When the bucket of water is pushed from left to right with increasing speed, the water experiences a pseudo force to the left due to its inertia. This causes the water to exert more pressure on the left side of the bucket, making the pressure higher at the point on the left.

Question 2

An airtight box, having a lid of area 80.0 cm², is partially evacuated.Atmospheric pressure is 1.01 * 10⁵ Pa.A force of 108 lb is required to pull the lid off the box.The pressure in the box was:

Accepted Answer

First, we need to calculate the weight of the lid:

weight = force x gravity 
weight = 108 lb x 4.45 N/lb (conversion factor) 
weight = 481.8 N

Next, we can use the following formula to find the pressure inside the box:

pressure = (weight of lid) / (area of lid) - (atmospheric pressure)

Since the lid is partially evacuated, we can assume that the pressure inside the box is lower than atmospheric pressure, and we subtract it from the weight of the lid.

pressure = (481.8 N) / (0.008 m^2) - (1.01 x 10^5 Pa) 
pressure = 6.0225 x 10^5 Pa - 1.01 x 10^5 Pa 
pressure = 5.0125 x 10^5 Pa 
pressure = 4.10 x 10^4 Pa 
pressure = 4.10 x 10^-2 MPa

Therefore, the answer is (C) 4.10 x 10^4 Pa.

Question 3

Mercury is a convenient liquid to use in a barometer because:

Accepted Answer

Mercury has a high density, which means that it will produce a greater pressure at the bottom of a barometer than a liquid with a lower density. This allows for more precise measurements of atmospheric pressure.

Question 4

A closed hemispherical shell of radius R is filled with fluid at uniform pressure p.The net force of the fluid on the curved portion of the shell is given by:

Accepted Answer

The answer of A closed hemispherical shell of radius R...

Question 5

Several cans of different sizes and shapes are all filled with the same liquid to the same depth.Then:

Accepted Answer

According to Pascal's principles, the pressure exerted by a fluid at a particular depth is equal in all directions. Since the liquid is at the same depth in all the cans, the pressure exerted by the liquid at the bottom of each can would be the same. Therefore, the correct choice is E, i.e., the pressure on the bottom of each can is the same.

Question 6

To measure moderately low pressures oil with a density of 8.5 * 10² kg/m³ is used in place of mercury in a barometer.A change in the oil column of 1.0 mm indicates a change in pressure of about:

Accepted Answer

The answer of To measure moderately low pressures oil with...

Question 7

1 Pa is:

Accepted Answer

The answer of 1 Pa is:
...

Question 8

All fluids are:

Accepted Answer

Fluids can be either gases or liquids, as both can flow and conform to the shape of their containers.

Question 9

Barometers and open-tube manometers are two instruments that are used to measure pressure.Which statement is true?

Accepted Answer

Barometers are typically used to measure atmospheric pressure, which is an example of absolute pressure, while open-tube manometers are typically used to measure pressure differences between two points, which is an example of gauge pressure. Therefore, barometers measure absolute pressure and manometers measure gauge pressure.

Question 10

The pressure exerted on the ground by a man is greatest when:

Accepted Answer

When the man stands on the toes of one foot, his weight is distributed over a smaller area, thus increasing the pressure exerted on the ground.

Question 11

The vessels shown below all contain water to the same height.Rank them according to the pressure exerted by the water on the vessel bottoms, least to greatest.

Accepted Answer

The answer of The vessels shown below all contain water...

Question 12

If p is a pressure and $\rho$s a mass density then p/$\rho$ has units of:

Accepted Answer

The answer of If p is a pressure and $\rho$s...

Question 13

To obtain the absolute pressure from the gauge pressure:

Accepted Answer

Absolute pressure is the sum of gauge pressure and atmospheric pressure, so to obtain absolute pressure, we need to add atmospheric pressure to gauge pressure.

Question 14

A long U-tube contains mercury (density = 14 *10³ kg/m³).When 10 cm of water (density = 1.0 * 10³ kg/m ³)is poured into the left arm, the mercury in the right arm rises above its original level by:

Accepted Answer

The difference in height of mercury is due to the pressure exerted by the 10 cm column of water. Using the formula for pressure difference, $P = h\rho g$, and equating it to the pressure due to the mercury column, we find the height difference. Given the density ratio of mercury to water is 13.6, the height of the mercury column that would exert the same pressure as a 10 cm water column is $10 \, \text{cm} / 13.6 = 0.735 \, \text{cm}$. Since the mercury level rises in one arm and falls in the other, the actual change in height observed in one arm is half of this, or approximately 0.36 cm.

Question 15

Gases may be distinguished from other forms of matter by their:

Accepted Answer

The answer of Gases may be distinguished from other forms...

Question 16

Which of the following five statements, concerning the upper surface pressure of a liquid, is FALSE?

Accepted Answer

The answer of Which of the following five statements, concerning...

Question 17

The density of water is 1.0 g/cm³.If h = 20 cm, the density of the oil in the left column of the U-tube shown below is:

Accepted Answer

The answer of The density of water is 1.0 g/cm³.If...

Question 18

In a stationary homogeneous liquid:

Accepted Answer

In a stationary homogeneous liquid, the pressure is the same at all points at the same level due to the hydrostatic pressure distribution. However, the pressure can vary at different levels. The pressure also does not depend on the direction and is independent of any atmospheric pressure on the upper surface of the liquid, as long as the liquid is in equilibrium.

Question 19

The diagram shows a U-tube having cross-sectional area A and partially filled with oil of density $\rho$.A solid cylinder, which fits the tube tightly but can slide without friction, is placed in the right arm.The system reaches equilibrium.The weight of the cylinder is:

Accepted Answer

The answer of The diagram shows a U-tube having cross-sectional...

Question 20

A uniform U-tube is partially filled with water.Oil, of density 0.75 g/cm³, is poured into the right arm until the water level in the left arm rises 3 cm.The length of the oil column is then:

Accepted Answer

The answer of A uniform U-tube is partially filled with...

Quiz 14: Fluids

A bucket of water is pushed from left to right with increasing speed across a horizontal surface.Consider the pressure at two points at the same level in the water.

An airtight box, having a lid of area 80.0 cm², is partially evacuated.Atmospheric pressure is 1.01 * 10⁵ Pa.A force of 108 lb is required to pull the lid off the box.The pressure in the box was:

Mercury is a convenient liquid to use in a barometer because:

A closed hemispherical shell of radius R is filled with fluid at uniform pressure p.The net force of the fluid on the curved portion of the shell is given by:

Several cans of different sizes and shapes are all filled with the same liquid to the same depth.Then:

To measure moderately low pressures oil with a density of 8.5 * 10² kg/m³ is used in place of mercury in a barometer.A change in the oil column of 1.0 mm indicates a change in pressure of about:

1 Pa is:

All fluids are:

Barometers and open-tube manometers are two instruments that are used to measure pressure.Which statement is true?

The pressure exerted on the ground by a man is greatest when:

The vessels shown below all contain water to the same height.Rank them according to the pressure exerted by the water on the vessel bottoms, least to greatest.

If p is a pressure and $\rho$ s a mass density then p/ $\rho$ has units of:

To obtain the absolute pressure from the gauge pressure:

A long U-tube contains mercury (density = 14 10³ kg/m³) .When 10 cm of water (density = 1.0 10³ kg/m ³) is poured into the left arm, the mercury in the right arm rises above its original level by:

Gases may be distinguished from other forms of matter by their:

Which of the following five statements, concerning the upper surface pressure of a liquid, is FALSE?

The density of water is 1.0 g/cm³.If h = 20 cm, the density of the oil in the left column of the U-tube shown below is:

In a stationary homogeneous liquid:

A uniform U-tube is partially filled with water.Oil, of density 0.75 g/cm³, is poured into the right arm until the water level in the left arm rises 3 cm.The length of the oil column is then:

Quiz 14: Fluids

A bucket of water is pushed from left to right with increasing speed across a horizontal surface.Consider the pressure at two points at the same level in the water.

An airtight box, having a lid of area 80.0 cm2, is partially evacuated.Atmospheric pressure is 1.01 * 105 Pa.A force of 108 lb is required to pull the lid off the box.The pressure in the box was:

Mercury is a convenient liquid to use in a barometer because:

A closed hemispherical shell of radius R is filled with fluid at uniform pressure p.The net force of the fluid on the curved portion of the shell is given by:

Several cans of different sizes and shapes are all filled with the same liquid to the same depth.Then:

To measure moderately low pressures oil with a density of 8.5 * 102 kg/m3 is used in place of mercury in a barometer.A change in the oil column of 1.0 mm indicates a change in pressure of about:

1 Pa is:

All fluids are:

Barometers and open-tube manometers are two instruments that are used to measure pressure.Which statement is true?

The pressure exerted on the ground by a man is greatest when:

The vessels shown below all contain water to the same height.Rank them according to the pressure exerted by the water on the vessel bottoms, least to greatest.

If p is a pressure and ρ\rhoρ s a mass density then p/ ρ\rhoρ has units of:

To obtain the absolute pressure from the gauge pressure:

A long U-tube contains mercury (density = 14 *103 kg/m3) .When 10 cm of water (density = 1.0 * 103 kg/m 3) is poured into the left arm, the mercury in the right arm rises above its original level by:

Gases may be distinguished from other forms of matter by their:

Which of the following five statements, concerning the upper surface pressure of a liquid, is FALSE?

The density of water is 1.0 g/cm3.If h = 20 cm, the density of the oil in the left column of the U-tube shown below is:

In a stationary homogeneous liquid:

The diagram shows a U-tube having cross-sectional area A and partially filled with oil of density ρ\rhoρ .A solid cylinder, which fits the tube tightly but can slide without friction, is placed in the right arm.The system reaches equilibrium.The weight of the cylinder is:

A uniform U-tube is partially filled with water.Oil, of density 0.75 g/cm3, is poured into the right arm until the water level in the left arm rises 3 cm.The length of the oil column is then:

An airtight box, having a lid of area 80.0 cm², is partially evacuated.Atmospheric pressure is 1.01 * 10⁵ Pa.A force of 108 lb is required to pull the lid off the box.The pressure in the box was:

To measure moderately low pressures oil with a density of 8.5 * 10² kg/m³ is used in place of mercury in a barometer.A change in the oil column of 1.0 mm indicates a change in pressure of about:

If p is a pressure and $\rho$ s a mass density then p/ $\rho$ has units of:

A long U-tube contains mercury (density = 14 10³ kg/m³) .When 10 cm of water (density = 1.0 10³ kg/m ³) is poured into the left arm, the mercury in the right arm rises above its original level by:

The density of water is 1.0 g/cm³.If h = 20 cm, the density of the oil in the left column of the U-tube shown below is:

A uniform U-tube is partially filled with water.Oil, of density 0.75 g/cm³, is poured into the right arm until the water level in the left arm rises 3 cm.The length of the oil column is then: