Physics

A fluid is flowing with an average speed of 1.50 m/s through a tube that has a r

A fluid is flowing with an average speed of 1.50 m/s through a tube that has a r

A fluid is flowing with an average speed of 1.50 m/s through a tube that has a radius of 2.00 mm and is 18 cm long. The drop in pressure is 967 Pa. What is the viscosity of the fluid?
A) 0.00179 Ns/m2
B) 0.00562 Ns/m2
C) 0.0278 Ns/m2

ppk   1450   1 Reply

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Motor oil, with a viscosity of 0.250 Ns/m2, is flowing through a tube that has a

Motor oil, with a viscosity of 0.250 Ns/m2, is flowing through a tube that has a

Motor oil, with a viscosity of 0.250 Ns/m2, is flowing through a tube that has a radius of 3.00 mm and is 1.00 m long. The drop in pressure is 200 kPa. What is the average speed of the oil?
A) 0.800 m/s
B) 0.900 m/s
C) 1.00 m/s
D)

ppk   2118   1 Reply

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In a section of horizontal pipe with a diameter of 3.00 cm the pressure is 100 k

In a section of horizontal pipe with a diameter of 3.00 cm the pressure is 100 k

In a section of horizontal pipe with a diameter of 3.00 cm the pressure is 100 kPa and water is flowing with a speed of 1.50 m/s. The pipe narrows to 2.00 cm. What is the pressure in the narrower region?
A) 95.4 kPa
B) 47.7 kPa
C) 44.4

ppk   2463   1 Reply

sci_expert

An airplane is flying in air with a density of 1.29 kg/m3. A pressure gauge meas

An airplane is flying in air with a density of 1.29 kg/m3. A pressure gauge meas

An airplane is flying in air with a density of 1.29 kg/m3. A pressure gauge measures the difference in pressure between a point on the nose of the airplane and a point on the fuselage. The pressure on the nose is higher by 60.0 kPa. What is the speed

ppk   1844   1 Reply

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Water is flowing through a V-shaped weir, which has a 30° vertex. The flow rate

Water is flowing through a V-shaped weir, which has a 30° vertex. The flow rate

Water is flowing through a V-shaped weir, which has a 30° vertex. The flow rate is 7.0 x 104 kg/s  and the speed of the flow is 5.0 m/s. What is the distance from the surface of the water to the vertex?
A) 3.6 m
B) 7.2 m
C) 4.8 m

ppk   1003   1 Reply

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Water is flowing in a drainage channel of rectangular cross-section. The width o

Water is flowing in a drainage channel of rectangular cross-section. The width o

Water is flowing in a drainage channel of rectangular cross-section. The width of the channel is 15 m, the depth of water is 8.0 m, and the speed of the flow is 2.5 m/s. What is the flow rate in kg/s?
A) 2.0 × 105 kg/s
B) 2.0 × 103 kg/s

ppk   2336   1 Reply

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Water is flowing in a drainage channel of rectangular cross-section. At one poin

Water is flowing in a drainage channel of rectangular cross-section. At one poin

Water is flowing in a drainage channel of rectangular cross-section. At one point, the width of the channel is 12 m, the depth of water is 6.0 m, and the speed of the flow is 2.5 m/s. At a point downstream, the width has narrowed to 9.0 m, and the de

ppk   1736   1 Reply

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Air is flowing through a rocket nozzle. Inside the rocket the air has a density

Air is flowing through a rocket nozzle. Inside the rocket the air has a density

Air is flowing through a rocket nozzle. Inside the rocket the air has a density of 5.25 kg/m3  and a speed of 1.20 m/s. The interior diameter of the rocket is 15.0 cm. At the nozzle exit, the diameter is 2.50 cm and the density is 1.29 kg/m3. Wh

ppk   3091   1 Reply

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An incompressible fluid flows steadily through a pipe that has a change in diame

An incompressible fluid flows steadily through a pipe that has a change in diame

An incompressible fluid flows steadily through a pipe that has a change in diameter. The fluid speed at a location where the pipe diameter is 8.0 cm is 1.28 m/s. What is the fluid speed at a location where the diameter has narrowed to 4.0 cm?
A)

ppk   3389   1 Reply

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In a certain one-lane road there are no entrances or exits. As the road passes t

In a certain one-lane road there are no entrances or exits. As the road passes t

In a certain one-lane road there are no entrances or exits. As the road passes through open country and populated areas, the speed limit changes. Assume that cars travel at the posted speed limit. In the open road, where the speed limit is 55 mph, th

ppk   1525   1 Reply

bio_man

A cylinder, semicircular in cross-section, 10.0 m long and 5.00 m in radius, is

A cylinder, semicircular in cross-section, 10.0 m long and 5.00 m in radius, is

A cylinder, semicircular in cross-section, 10.0 m long and 5.00 m in radius, is completely submerged in water. What is the buoyant force on the cylinder?
A) 1.92 × 106 N
B) 3.85 × 106 N
C) 5.78 × 106 N
D) 6.28 × 106 N
E) 7.70

ppk   1913   1 Reply

bio_man

The bathyscaphe Trieste consists of a cylindrical hull, 15.2 m long and 3.66 m i

The bathyscaphe Trieste consists of a cylindrical hull, 15.2 m long and 3.66 m i

The bathyscaphe Trieste consists of a cylindrical hull, 15.2 m long and 3.66 m in diameter, filled with gasoline with a density of 880 kg/m3 to make it buoyant. If it is totally submerged in salt water with a density of 1025 kg/m3 and neither rising

ppk   815   1 Reply

bio_man

A person who weighs 550 N empties her lungs as much as possible and is then comp

A person who weighs 550 N empties her lungs as much as possible and is then comp

A person who weighs 550 N empties her lungs as much as possible and is then completely immersed in water while suspended from a harness. Her apparent weight is now 21.2 N. What is her density?
A) 1050 kg/m3
B) 1040 kg/m3
C) 1030 kg/m3

ppk   1928   1 Reply

bio_man

A hot air balloon plus its cargo has a mass of 400 kg, and it holds 700 m3 of ho

A hot air balloon plus its cargo has a mass of 400 kg, and it holds 700 m3 of ho

A hot air balloon plus its cargo has a mass of 400 kg, and it holds 700 m3 of hot air. It is floating at a constant height in air with a density of 1.29 kg/m3. What is the density of the hot air in the balloon?
A) 1.39 kg/m3
B) 0.72 kg/m3

ppk   1861   1 Reply

bio_man

A barge with vertical sides is 10.0 m wide and 60.0 m long and is floating in fr

A barge with vertical sides is 10.0 m wide and 60.0 m long and is floating in fr

A barge with vertical sides is 10.0 m wide and 60.0 m long and is floating in fresh water. How much deeper into the water does the barge sink when 300,000 kg of coal are loaded on the barge?
A) 25.0 cm
B) 50.0 cm
C) 75.0 cm
D) 1.0

ppk   2462   1 Reply

bio_man

A spar buoy consists of a circular cylinder, which floats with its axis oriented

A spar buoy consists of a circular cylinder, which floats with its axis oriented

A spar buoy consists of a circular cylinder, which floats with its axis oriented vertically. One such buoy has a radius of 1.00 m, a height of 2.00 m, and weighs 40.0 kN. What portion of it is submerged when it is floating in fresh water?
A) 1.3

ppk   2657   1 Reply

bio_man

) A 12,000-N car is raised using a hydraulic lift, which consists of a U-tube wi

) A 12,000-N car is raised using a hydraulic lift, which consists of a U-tube wi

) A 12,000-N car is raised using a hydraulic lift, which consists of a U-tube with arms of unequal areas, filled with oil with a density of 800 kg/m3 and capped at both ends with tight-fitting pistons. The wider arm of the U-tube has a radius of 18.0

ppk   2158   1 Reply

bio_man

A 12,000-N car is raised using a hydraulic lift, which consists of a U-tube with

A 12,000-N car is raised using a hydraulic lift, which consists of a U-tube with

A 12,000-N car is raised using a hydraulic lift, which consists of a U-tube with arms of unequal areas, filled with oil and capped at both ends with tight-fitting pistons. The wider arm of the U-tube has a radius of 18.0 cm and the narrower arm has a

ppk   1128   1 Reply

bio_man

A U-tube is open to the atmosphere at both ends. Water is poured into the tube u

A U-tube is open to the atmosphere at both ends. Water is poured into the tube u

A U-tube is open to the atmosphere at both ends. Water is poured into the tube until the water rises part-way along the straight sides, and then some oil with a density of 920 kg/m3 is poured into one end. This causes the water surface on that side o

ppk   957   1 Reply

bio_man

A cubical box 25.00 cm on each side is immersed in a fluid. The pressure at the

A cubical box 25.00 cm on each side is immersed in a fluid. The pressure at the

A cubical box 25.00 cm on each side is immersed in a fluid. The pressure at the top surface of the box is 109.4 kPa and the pressure on the bottom surface is 112 kPa. What is the density of the fluid?
A) 1000 kg/m3
B) 1030 kg/m3
C) 106

ppk   1292   1 Reply

sci_expert

The deepest point of the Pacific Ocean is 11,033 m, in the Mariana Trench. What

The deepest point of the Pacific Ocean is 11,033 m, in the Mariana Trench. What

The deepest point of the Pacific Ocean is 11,033 m, in the Mariana Trench. What is the water pressure at that point? The density of seawater is 1025 kg/m3.
A) 5.55 × 107 Pa
B) 8.88 × 107 Pa
C) 1.11 × 108 Pa
D) 2.22 × 108 Pa
E

ppk   2447   1 Reply

sci_expert

The Aswan High Dam is 111 m high. What is the water pressure at the foot of the

The Aswan High Dam is 111 m high. What is the water pressure at the foot of the

The Aswan High Dam is 111 m high. What is the water pressure at the foot of the dam?
A) 1.09 × 106 Pa
B) 1.16 × 106 Pa
C) 1.09 × 103 Pa
D) 1.11 × 105 Pa
E) 1.11 × 102 Pa

ppk   3843   1 Reply

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The weight of a 1200-kg car is supported equally by the four tires, which are in

The weight of a 1200-kg car is supported equally by the four tires, which are in

The weight of a 1200-kg car is supported equally by the four tires, which are inflated to the same gauge pressure. What gauge pressure is required so the area of contact of each tire with the road is  100 cm2?
A) 11.6 × 105 Pa
B) 11.6

ppk   2299   1 Reply

sci_expert

A 100-kg person sits on a 5-kg bicycle. The weight is borne equally by the two w

A 100-kg person sits on a 5-kg bicycle. The weight is borne equally by the two w

A 100-kg person sits on a 5-kg bicycle. The weight is borne equally by the two wheels of the bicycle. The tires are inflated to a gauge pressure of 8.0 x 105 Pa  and are 2.0 cm wide. What length of each tire is in contact with the ground?
A

ppk   2771   1 Reply

sci_expert

A basketball player pushes down with a force of 50 N on a basketball that is inf

A basketball player pushes down with a force of 50 N on a basketball that is inf

A basketball player pushes down with a force of 50 N on a basketball that is inflated to a gauge pressure of 8.0 x 104 Pa. What is the diameter of contact between the ball and the floor?
A) 2.8 cm
B) 1.4 cm
C) 1.7 cm
D) 2.1 cm

ppk   2367   1 Reply

sci_expert

Substance A has a density of 3.0 g/cm3 and substance B has a density of 4.0 g/cm

Substance A has a density of 3.0 g/cm3 and substance B has a density of 4.0 g/cm

Substance A has a density of 3.0 g/cm3 and substance B has a density of 4.0 g/cm3.  In order to obtain equal masses of these two substances, the ratio of the volume of A to the volume of B will be equal to
A) 1:3.
B) 4:3.
C) 3:4.

ppk   1984   1 Reply

bio_man

1938 nickel has a diameter of 21.21 mm, a thickness of 1.95 mm, and weighs 0.04

1938 nickel has a diameter of 21.21 mm, a thickness of 1.95 mm, and weighs 0.04

 1938 nickel has a diameter of 21.21 mm, a thickness of 1.95 mm, and weighs 0.04905 N. What is its density?
A) 1.37 × 10-4 kg/m3
B) 1.82 × 103 kg/m3
C) 19.3 × 103 kg/m3
D) 3.63 × 103 kg/m3
E) 7.26 × 103 kg/m3

ppk   3549   1 Reply

bio_man

A 1959 penny has a diameter of 19.55 mm, a thickness of 1.55 mm, and a mass of 2

A 1959 penny has a diameter of 19.55 mm, a thickness of 1.55 mm, and a mass of 2

A 1959 penny has a diameter of 19.55 mm, a thickness of 1.55 mm, and a mass of 2.500 g. What is its density?
A) 5.37 × 103 kg/m3
B) 21.5 × 103 kg/m3
C) 1.34 × 103 kg/m3
D) 2.68 × 103 kg/m3
E) 1.86 × 10-4 kg/m3

ppk   3567   1 Reply

bio_man

The density of air is 1.29 kg/m3. What is the mass of the air inside a room 4.0

The density of air is 1.29 kg/m3. What is the mass of the air inside a room 4.0

The density of air is 1.29 kg/m3. What is the mass of the air inside a room 4.0 m × 3.0 m × 2.0 m?
A) 0.32 kg
B) 3.1 kg
C) 31 kg
D) 1.9 kg
E) 19 kg

ppk   3413   1 Reply

bio_man

A sphere is constructed of two concentric pieces. The inner part is a solid sph

A sphere is constructed of two concentric pieces. The inner part is a solid sph

A sphere is constructed of two concentric pieces.  The inner part is a solid sphere of radius 10.0 cm made of a material with density 4000 kg/m3.  The outer part is a spherical shell with inner radius 10.0 cm and outer radius 20.0 cm. 

ppk   2463   1 Reply

bio_man

When soup gets cold, it often tastes greasy. This "greasy" taste seems to be as

When soup gets cold, it often tastes greasy. This "greasy" taste seems to be as

When soup gets cold, it often tastes greasy.  This "greasy" taste seems to be associated with oil spreading out all over the surface of the soup, instead of staying in little globules.  This is readily explained in terms of
A

ppk   1602   1 Reply

bio_man

The fact that a pin placed carefully on the surface of the water can remain ther

The fact that a pin placed carefully on the surface of the water can remain ther

The fact that a pin placed carefully on the surface of the water can remain there without sinking is best explained by
A) gravitation.
B) gauge pressure.
C) surface tension.
D) Archimedes' principle.
E) viscosity.

ppk   3023   1 Reply

bio_man

The fact that a dew drop is spherical is best described in terms of

The fact that a dew drop is spherical is best described in terms of

The fact that a dew drop is spherical is best described in terms of
A) gravitation.
B) gauge pressure.
C) surface tension.
D) Archimedes' principle.
E) viscosity.

ppk   1413   1 Reply

bio_man

The pressure drop in a tube carrying a viscous fluid is described by

The pressure drop in a tube carrying a viscous fluid is described by

The pressure drop in a tube carrying a viscous fluid is described by
A) Bernoulli's principle.
B) Pascal's principle.
C) Archimedes' principle.
D) Poiseuille's equation.
E) Newton's Second law.

ppk   1939   1 Reply

bio_man

The flow of water emerging from a hole in a container is best described in terms

The flow of water emerging from a hole in a container is best described in terms

The flow of water emerging from a hole in a container is best described in terms of
A) Torricelli's law.
B) Pascal's principle.
C) Archimedes' principle.
D) Poiseuille's equation.
E) Newton's Second l

ppk   935   1 Reply

bio_man

When you blow some air above a paper strip, the paper rises. This is because

When you blow some air above a paper strip, the paper rises. This is because

When you blow some air above a paper strip, the paper rises.  This is because
A) the air above the paper moves faster and the pressure is higher.
B) the air above the paper moves faster and the pressure is lower.
C) the air above

ppk   2328   1 Reply

bio_man

Bernoulli's principle is a statement of the

Bernoulli's principle is a statement of the

Bernoulli's principle is a statement of the
A) conservation of linear momentum.
B) conservation of mass.
C) conservation of energy.
D) conservation of kinetic energy.
E) conservation of angular momentum.

ppk   920   1 Reply

bio_man

Two horizontal pipes are the same length, but pipe B has twice the diameter of p

Two horizontal pipes are the same length, but pipe B has twice the diameter of p

Two horizontal pipes are the same length, but pipe B has twice the diameter of pipe A.  Water undergoes viscous flow in both pipes, subject to the same pressure difference across the lengths of the pipes.  If the flow rate in pipe A is Q, w

ppk   2646   1 Reply

bio_man

Water flows through a pipe. The diameter of the pipe at point B is larger than

Water flows through a pipe. The diameter of the pipe at point B is larger than

Water flows through a pipe.  The diameter of the pipe at point B is larger than at point A.  Where is the speed of the water greater?
A) point A
B) point B
C) same at both A and B
D) Cannot be determined from the informa

ppk   2491   1 Reply

bio_man

The equation of continuity is a statement of the

The equation of continuity is a statement of the

The equation of continuity is a statement of the
A) conservation of linear momentum.
B) conservation of mass.
C) conservation of energy.
D) conservation of kinetic energy.
E) conservation of angular momentum.

ppk   707   1 Reply

bio_man