Question 1

The weight that will cause a wire of diameter d to stretch a given distance, for a fixed length of wire, is

Accepted Answer

A)  proportional to d. 
B)  independent of what the length of the wire is. 
C)  independent of d. 
D)  proportional to d2. 
A)  proportional to d. 
B)  independent of what the length of the wire is. 
C)  independent of d. 
D)  proportional to d2.

Question 2

A cylindrical rod of length 12. cm and diameter 2.0 cm will just barely float in water. What is its mass?

Accepted Answer

The answer of A cylindrical rod of length 12. cm...

Question 3

What is the gauge pressure at a depth of 100 m. in water?

Accepted Answer

The answer of What is the gauge pressure at a...

Question 4

As a helium-filled dirigible rises in the atmosphere, the buoyancy force is expected to

Accepted Answer

A)  increase. 
B)  decrease. 
C)  remain constant. 
A)  increase. 
B)  decrease. 
C)  remain constant.

Question 5

When a small spherical rock of radius r falls through water, it experiences a drag force (a) is its velocity and "a" is a constant proportional to the viscosity of water. From this, one can deduce that if a rock of diameter 2 mm falls with terminal velocity, "v," then a rock of diameter 4 mm will fall with terminal velocity

Accepted Answer

A)  2 v. 
B)  4 v. 
C)  v / 4. 
D)  v. 
E)  v / 2. 
A)  2 v. 
B)  4 v. 
C)  v / 4. 
D)  v. 
E)  v / 2.

Question 6

The surface tension of water is 0.073 N/m. How high will water rise in a capillary tube of diameter 1.20 mm?

Accepted Answer

The answer of The surface tension of water is 0.073...

Question 7

A hole of radius 1.0 mm occurs in the bottom of a water storage tank that holds water at a depth of 15 m. At what rate will water flow out of the hole?

Accepted Answer

The answer of A hole of radius 1.0 mm occurs...

Question 8

When a baseball pitcher throws a curve ball, he makes the ball spin about an axis ________ the direction in which the ball's center of mass is moving.

Accepted Answer

A)  perpendicular to 
B)  parallel to 
C)  45° with respect to 
A)  perpendicular to 
B)  parallel to 
C)  45° with respect to

Question 9

A sunken steel ship has a mass of 500,000 kg. It is filled with water. In order to lift the ship, air bags are to be inflated inside the hull. What volume of air is needed if 7.8 is the specific gravity of steel?

Accepted Answer

A)  436 m3 
B)  872 m3 
C)  2778 m3 
D)  225 m3 
E)  1266 m3 
A)  436 m3 
B)  872 m3 
C)  2778 m3 
D)  225 m3 
E)  1266 m3

Question 10

The SAE grade (e.g. SAE 20W) is an indicator of oil

Accepted Answer

A)  pressure. 
B)  surface tension. 
C)  viscosity. 
D)  density. 
E)  Reynolds number. 
A)  pressure. 
B)  surface tension. 
C)  viscosity. 
D)  density. 
E)  Reynolds number.

Question 11

A copper wire is found to break when subjected to minimum tension of 36. N. If the wire diameter were half as great, we would expect the wire to break when subjected to a minimum tension of

Accepted Answer

A)  18 N 
B)  26. N 
C)  51. N 
D)  9.0 N 
E)  36. N 
A)  18 N 
B)  26. N 
C)  51. N 
D)  9.0 N 
E)  36. N

Question 12

A mass of 50. kg is suspended from a steel wire of diameter 1.0 mm and length 11.2 m. How much will the wire stretch? (The Young's modulus for steel is 20 × 1010 N/m2.)

Accepted Answer

Question 13

7.0 kg is hung from a steel wire of diameter 0.75 mm and length 2.5 meters.
(S = 8.2 × 1010 N/m2; Y = 20 × 1010 N/m2) 
(a) By how much does the wire stretch?
(b) If the wire diameter were doubled, what would be the stretch?

Accepted Answer

(a) 1.9 mm

Question 14

Consider diving 20.0 m below the surface of the ocean (density 1.03 grams/cc) 
(a) what is the gauge pressure at that depth, in atmospheres?
(b) what is the absolute pressure at that depth, in atmospheres?
(c) If you were in a submarine at that depth, what would be the total force on a 100. cm2 window?

Accepted Answer

(a) 1.99 a

Question 15

An ideal fluid in a pipe of diameter 14. cm is moving at 6.0 m/s.
(a) If the incompressible fluid density is 1.05 grams/cc, what is the flow rate in kg/s?
(b) What is the speed of flow if the pipe narrows to 4.0 cm radius?

Accepted Answer

(a) 97. kg

Question 16

The slope of the straight line shown on the graph in Figure 9-1 is called the

Accepted Answer

A)  compressibility. 
B)  Young's modulus. 
C)  bulk modulus. 
D)  pressure. 
A)  compressibility. 
B)  Young's modulus. 
C)  bulk modulus. 
D)  pressure.

Question 17

A spherical hot air balloon of diameter 20. meters just floats (hovers) when the hot air inside has been heated to a density of 1.00 kg/m3. What is the weight of the balloon and cargo (not including the air inside) if the surrounding air has a density of 1.30 kg/m3?

Accepted Answer

1.2 × 10⁴ N

Question 18

A ship that weighs 10,000 tons (mass 10 million kg) must displace what volume of fresh water in order to float?

Accepted Answer

A)  1010m3 
B)  1012m3 
C)  104m3 
D)  107m3 
E)  108m3 
A)  1010m3 
B)  1012m3 
C)  104m3 
D)  107m3 
E)  108m3

Question 19

The density of water is

Accepted Answer

A)  1.0 × 103 kg/cm3. 
B)  1.0 kg/m3. 
C)  1.0 × 10-3 g/m3. 
D)  1.0 Mg/m3. 
E)  1.0 × 101 kg/cm3. 
A)  1.0 × 103 kg/cm3. 
B)  1.0 kg/m3. 
C)  1.0 × 10-3 g/m3. 
D)  1.0 Mg/m3. 
E)  1.0 × 101 kg/cm3.

Question 20

SAE No. 10 oil has a viscosity of 0.20 Pa-s. How long would it take to pour 4.0 L of oil through a funnel with a neck 15. cm long and 2.0 cm in diameter? (Assume the surface of the oil is kept 6.0 cm above the top of the neck, and neglect any drag effects due to the upper part of the funnel.)

Accepted Answer

A)  52 s 
B)  84 s 
C)  105 s 
D)  1.5 minutes 
E)  46 s 
A)  52 s 
B)  84 s 
C)  105 s 
D)  1.5 minutes 
E)  46 s

Exam 9: Solids and Fluids

The weight that will cause a wire of diameter d to stretch a given distance, for a fixed length of wire, is

A cylindrical rod of length 12. cm and diameter 2.0 cm will just barely float in water. What is its mass?

What is the gauge pressure at a depth of 100 m. in water?

As a helium-filled dirigible rises in the atmosphere, the buoyancy force is expected to

The surface tension of water is 0.073 N/m. How high will water rise in a capillary tube of diameter 1.20 mm?

A hole of radius 1.0 mm occurs in the bottom of a water storage tank that holds water at a depth of 15 m. At what rate will water flow out of the hole?

When a baseball pitcher throws a curve ball, he makes the ball spin about an axis ________ the direction in which the ball's center of mass is moving.

A sunken steel ship has a mass of 500,000 kg. It is filled with water. In order to lift the ship, air bags are to be inflated inside the hull. What volume of air is needed if 7.8 is the specific gravity of steel?

The SAE grade (e.g. SAE 20W) is an indicator of oil

A copper wire is found to break when subjected to minimum tension of 36. N. If the wire diameter were half as great, we would expect the wire to break when subjected to a minimum tension of

A mass of 50. kg is suspended from a steel wire of diameter 1.0 mm and length 11.2 m. How much will the wire stretch? (The Young's modulus for steel is 20 × 1010 N/m2.)

7.0 kg is hung from a steel wire of diameter 0.75 mm and length 2.5 meters. (S = 8.2 × 1010 N/m2; Y = 20 × 1010 N/m2) (a) By how much does the wire stretch? (b) If the wire diameter were doubled, what would be the stretch?

An ideal fluid in a pipe of diameter 14. cm is moving at 6.0 m/s. (a) If the incompressible fluid density is 1.05 grams/cc, what is the flow rate in kg/s? (b) What is the speed of flow if the pipe narrows to 4.0 cm radius?

The slope of the straight line shown on the graph in Figure 9-1 is called the

A spherical hot air balloon of diameter 20. meters just floats (hovers) when the hot air inside has been heated to a density of 1.00 kg/m3. What is the weight of the balloon and cargo (not including the air inside) if the surrounding air has a density of 1.30 kg/m3?

A ship that weighs 10,000 tons (mass 10 million kg) must displace what volume of fresh water in order to float?

The density of water is

SAE No. 10 oil has a viscosity of 0.20 Pa-s. How long would it take to pour 4.0 L of oil through a funnel with a neck 15. cm long and 2.0 cm in diameter? (Assume the surface of the oil is kept 6.0 cm above the top of the neck, and neglect any drag effects due to the upper part of the funnel.)

Measurement and Problem Solving

Kinematics: Description of Motion

Motion in Two Dimensions

Force and Motion

Work and Energy

Linear Momentum and Collisions

Circular Motion and Gravitation

Rotational Motion and Equilibrium

Temperature and Kinetic Theory

Heat

Thermodynamics

Vibrations and Waves

Sound

Electric Charge, Forces, and Fields

Electric Potential, Energy, and Capacitance

Electric Current and Resistance

Basic Electric Circuits

Magnetism

Electromagnetic Induction and Waves

AC Circuits

Reflection and Refraction of Light

Mirrors and Lenses

Physical Optics: The Wave Nature of Light

Vision and Optical Instruments

Relativity

Quantum Physics

Quantum Mechanics and Atomic Physics

The Nucleus

Nuclear Reactions and Elementary Particles

Filters

A mass of 50. kg is suspended from a steel wire of diameter 1.0 mm and length 11.2 m. How much will the wire stretch? (The Young's modulus for steel is 20 × 10¹⁰ N/m².)

7.0 kg is hung from a steel wire of diameter 0.75 mm and length 2.5 meters. (S = 8.2 × 10¹⁰ N/m²; Y = 20 × 10¹⁰ N/m²) (a) By how much does the wire stretch? (b) If the wire diameter were doubled, what would be the stretch?

A spherical hot air balloon of diameter 20. meters just floats (hovers) when the hot air inside has been heated to a density of 1.00 kg/m³. What is the weight of the balloon and cargo (not including the air inside) if the surrounding air has a density of 1.30 kg/m³?