Question 1

A block of wood weighs 160 N and has a specific gravity of 0.60. To sink it in fresh water requires an additional downward force of:

Accepted Answer

A)  54 N 
B)  64 N 
C)  96 N 
D)  110 N 
E)  240 N 
A)  54 N 
B)  64 N 
C)  96 N 
D)  110 N 
E)  240 N

Question 2

The dimensions of a wooden raft (density = 150 kg/m3) are 3.0 m * 3.0 m * 1.0 m. What maximum load can it carry in sea water (density =1020 kg/m3)?

Accepted Answer

A)  1350 kg 
B)  7800 kg 
C)  9200 kg 
D)  19,500 kg 
E)  24,300 kg 
A)  1350 kg 
B)  7800 kg 
C)  9200 kg 
D)  19,500 kg 
E)  24,300 kg

Question 3

A solid has a volume of 8 cm3. When weighed on a spring scale calibrated in grams, the scale indicates 20 g. What does the scale indicate if the object is weighed while immersed in a liquid of density 2 g/cm3?

Accepted Answer

A)  4 g 
B)  10 g 
C)  12 g 
D)  16 g 
E)  zero, since the object will float 
A)  4 g 
B)  10 g 
C)  12 g 
D)  16 g 
E)  zero, since the object will float

Question 4

Water (density = 1.0 * 103 kg/m3) flows through a horizontal tapered pipe. At the wide end its speed is 4.0 m/s The difference in pressure between the two ends is 4.5 *103 Pa. The speed of the water at the narrow end is::

Accepted Answer

A)  2.6 m/s 
B)  3.4 m/s 
C)  4.0 m/s 
D)  4.5 m/s 
E)  5.0 m/s 
A)  2.6 m/s 
B)  3.4 m/s 
C)  4.0 m/s 
D)  4.5 m/s 
E)  5.0 m/s

Question 5

A person blows across the top of one arm of a U-tube partially filled with water. The water in that arm:

Accepted Answer

A)  rises slightly 
B)  drops slightly 
C)  remains at the same height 
D)  rises if the blowing is soft but drops if it is hard 
E)  rises if the blowing is hard but drops if it is soft 
A)  rises slightly 
B)  drops slightly 
C)  remains at the same height 
D)  rises if the blowing is soft but drops if it is hard 
E)  rises if the blowing is hard but drops if it is soft

Question 6

To obtain the absolute pressure from the gauge pressure:

Accepted Answer

A)  subtract atmospheric pressure 
B)  add atmospheric pressure 
C)  subtract 273 
D)  add 273 
E)  convert to N/m2 
A)  subtract atmospheric pressure 
B)  add atmospheric pressure 
C)  subtract 273 
D)  add 273 
E)  convert to N/m2

Question 7

A boat floating in fresh water displaces 16,000 N of water. How many newtons of salt-water would it displace if it floats in salt-water of specific gravity 1.17?

Accepted Answer

A)  14,500 
B)  17,600 
C)  16,000 
D)  284 
E)  234 
A)  14,500 
B)  17,600 
C)  16,000 
D)  284 
E)  234

Question 8

Barometers and open-tube manometers are two instruments that are used to measure pressure.

Accepted Answer

A)  Both measure gauge pressure 
B)  Both measure absolute pressure 
C)  Barometers measure gauge pressure and manometers measure absolute pressure 
D)  Barometers measure absolute pressure and manometers measure gauge pressure 
E)  Both measure an average of the absolute and gauge pressures 
A)  Both measure gauge pressure 
B)  Both measure absolute pressure 
C)  Barometers measure gauge pressure and manometers measure absolute pressure 
D)  Barometers measure absolute pressure and manometers measure gauge pressure 
E)  Both measure an average of the absolute and gauge pressures

Question 9

A loaded ship passes from a lake (fresh water) to the ocean (salt water). Salt water is more dense than fresh water and as a result the ship will:

Accepted Answer

A)  ride higher in the water 
B)  settle lower in the water 
C)  ride at the same level in the water 
D)  experience an increase in buoyant force 
E)  experience a decrease in buoyant force 
A)  ride higher in the water 
B)  settle lower in the water 
C)  ride at the same level in the water 
D)  experience an increase in buoyant force 
E)  experience a decrease in buoyant force

Question 10

The principle of fluid pressure which is used in hydraulic brakes or lifts is that:

Accepted Answer

A)  pressure is the same at all levels in a fluid 
B)  increases of pressure are transmitted equally to all parts of a fluid 
C)  the pressure at a point in a fluid is due to the weight of the fluid above it 
D)  increases of pressure can only be transmitted through fluids 
E)  the pressure at a given depth is proportional to the depth in the fluid 
A)  pressure is the same at all levels in a fluid 
B)  increases of pressure are transmitted equally to all parts of a fluid 
C)  the pressure at a point in a fluid is due to the weight of the fluid above it 
D)  increases of pressure can only be transmitted through fluids 
E)  the pressure at a given depth is proportional to the depth in the fluid

Question 11

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

A)  It is the same 
B)  It is higher at the point on the left 
C)  It is higher at the point on the right 
D)  At first it is higher at the point on the left but as the bucket speeds up it is lower there 
E)  At first it is higher at the point on the right but as the bucket speeds up it is lower there 
A)  It is the same 
B)  It is higher at the point on the left 
C)  It is higher at the point on the right 
D)  At first it is higher at the point on the left but as the bucket speeds up it is lower there 
E)  At first it is higher at the point on the right but as the bucket speeds up it is lower there

Question 12

One end of a cylindrical pipe has a radius of 1.5 cm. Water (density = 1.0 * 103 kg/m3) streams steadily out at 7.0 m/s. The rate at which mass is leaving the pipe is:

Accepted Answer

A)  2.5 kg/s 
B)  4.9 kg/s 
C)  7.0 kg/s 
D)  48 kg/s 
E)  7.0 * 103 kg/s 
A)  2.5 kg/s 
B)  4.9 kg/s 
C)  7.0 kg/s 
D)  48 kg/s 
E)  7.0 * 103 kg/s

Question 13

A block of ice at 0$\degree$C is floating on the surface of ice water in a beaker. The surface of the water just comes to the top of the beaker. When the ice melts the water level will:

Accepted Answer

A)  rise and overflow will occur 
B)  remain the same 
C)  fall 
D)  depend on the initial ratio of water to ice 
E)  depend on the shape of the block of ice 
A)  rise and overflow will occur 
B)  remain the same 
C)  fall 
D)  depend on the initial ratio of water to ice 
E)  depend on the shape of the block of ice

Question 14

A cork floats on the surface of an incompressible liquid in a container exposed to atmospheric pressure. The container is then sealed and the air above the liquid is evacuated. The cork:

Accepted Answer

A)  sinks slightly 
B)  rises slightly 
C)  floats at the same height 
D)  bobs up and down about its old position 
E)  behaves erratically 
A)  sinks slightly 
B)  rises slightly 
C)  floats at the same height 
D)  bobs up and down about its old position 
E)  behaves erratically

Question 15

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

A)  1, 2, 3, 4 
B)  3, 4, 2, 1 
C)  4, 3, 2, 1 
D)  2, 3, 4, 1 
E)  All pressures are the same 
A)  1, 2, 3, 4 
B)  3, 4, 2, 1 
C)  4, 3, 2, 1 
D)  2, 3, 4, 1 
E)  All pressures are the same

Question 16

A fir wood board floats in fresh water with 60% of its volume under water. The density of the wood in g/cm3 is:

Accepted Answer

A)  0.4 
B)  0.5 
C)  0.6 
D)  less than 0.4 
E)  more than 0.6 
A)  0.4 
B)  0.5 
C)  0.6 
D)  less than 0.4 
E)  more than 0.6

Question 17

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

Accepted Answer

A)  it is independent of the surface area 
B)  it is the same for all points on that surface 
C)  it would not increase if the liquid depth were increased 
D)  it would increase if the liquid density were increased 
E)  it would increase if the atmospheric pressure increased 
A)  it is independent of the surface area 
B)  it is the same for all points on that surface 
C)  it would not increase if the liquid depth were increased 
D)  it would increase if the liquid density were increased 
E)  it would increase if the atmospheric pressure increased

Question 18

Water flows through a cylindrical pipe of varying cross-section. The velocity is 3.0 m/s at a point where the pipe diameter is 1.0 cm. At a point where the pipe diameter is 3.0 cm, the velocity is:

Accepted Answer

A)  9 m/s 
B)  3 m/s 
C)  1 m/s 
D)  0.33 m/s 
E)  0.11 m/s 
A)  9 m/s 
B)  3 m/s 
C)  1 m/s 
D)  0.33 m/s 
E)  0.11 m/s

Question 19

Consider a pipe containing a fluid, with the fluid being at rest. To apply Bernoulli's equation to this situation:

Accepted Answer

A)  set v equal to zero because there is no motion 
B)  set g equal to zero because there is no acceleration 
C)  set v and g both equal to zero 
D)  set p equal to the atmospheric pressure 
E)  cannot be done, Bernoulli's equation applies only to fluids in motion 
A)  set v equal to zero because there is no motion 
B)  set g equal to zero because there is no acceleration 
C)  set v and g both equal to zero 
D)  set p equal to the atmospheric pressure 
E)  cannot be done, Bernoulli's equation applies only to fluids in motion

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

A)  2.25 cm 
B)  8 cm 
C)  6 cm 
D)  4 cm 
E)  need to know the cross-sectional area of the U-tube 
A)  2.25 cm 
B)  8 cm 
C)  6 cm 
D)  4 cm 
E)  need to know the cross-sectional area of the U-tube

Exam 14: Fluids

A block of wood weighs 160 N and has a specific gravity of 0.60. To sink it in fresh water requires an additional downward force of:

The dimensions of a wooden raft (density = 150 kg/m3) are 3.0 m * 3.0 m * 1.0 m. What maximum load can it carry in sea water (density =1020 kg/m3)?

A solid has a volume of 8 cm3. When weighed on a spring scale calibrated in grams, the scale indicates 20 g. What does the scale indicate if the object is weighed while immersed in a liquid of density 2 g/cm3?

Water (density = 1.0 * 103 kg/m3) flows through a horizontal tapered pipe. At the wide end its speed is 4.0 m/s The difference in pressure between the two ends is 4.5 *103 Pa. The speed of the water at the narrow end is::

A person blows across the top of one arm of a U-tube partially filled with water. The water in that arm:

To obtain the absolute pressure from the gauge pressure:

A boat floating in fresh water displaces 16,000 N of water. How many newtons of salt-water would it displace if it floats in salt-water of specific gravity 1.17?

Barometers and open-tube manometers are two instruments that are used to measure pressure.

A loaded ship passes from a lake (fresh water) to the ocean (salt water). Salt water is more dense than fresh water and as a result the ship will:

The principle of fluid pressure which is used in hydraulic brakes or lifts is that:

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.

One end of a cylindrical pipe has a radius of 1.5 cm. Water (density = 1.0 * 103 kg/m3) streams steadily out at 7.0 m/s. The rate at which mass is leaving the pipe is:

A block of ice at 0 °\degree° C is floating on the surface of ice water in a beaker. The surface of the water just comes to the top of the beaker. When the ice melts the water level will:

A cork floats on the surface of an incompressible liquid in a container exposed to atmospheric pressure. The container is then sealed and the air above the liquid is evacuated. The cork:

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.

A fir wood board floats in fresh water with 60% of its volume under water. The density of the wood in g/cm3 is:

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

Water flows through a cylindrical pipe of varying cross-section. The velocity is 3.0 m/s at a point where the pipe diameter is 1.0 cm. At a point where the pipe diameter is 3.0 cm, the velocity is:

Consider a pipe containing a fluid, with the fluid being at rest. To apply Bernoulli's equation to this situation:

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:

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The dimensions of a wooden raft (density = 150 kg/m³) are 3.0 m * 3.0 m * 1.0 m. What maximum load can it carry in sea water (density =1020 kg/m³)?

A solid has a volume of 8 cm³. When weighed on a spring scale calibrated in grams, the scale indicates 20 g. What does the scale indicate if the object is weighed while immersed in a liquid of density 2 g/cm³?

Water (density = 1.0 * 10³ kg/m³) flows through a horizontal tapered pipe. At the wide end its speed is 4.0 m/s The difference in pressure between the two ends is 4.5 *10³ Pa. The speed of the water at the narrow end is::

One end of a cylindrical pipe has a radius of 1.5 cm. Water (density = 1.0 * 10³ kg/m³) streams steadily out at 7.0 m/s. The rate at which mass is leaving the pipe is:

A block of ice at 0 $\degree$ C is floating on the surface of ice water in a beaker. The surface of the water just comes to the top of the beaker. When the ice melts the water level will:

A fir wood board floats in fresh water with 60% of its volume under water. The density of the wood in g/cm³ 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: