Question 1

State Bernoulli's principle.

Accepted Answer

Where the velocity of fluid is

Question 2

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?

Accepted Answer

A)  1050 kg/m3 
B)  1040 kg/m3 
C)  1030 kg/m3 
D)  960 kg/m3 
E)  56.1 kg/m3 
A)  1050 kg/m3 
B)  1040 kg/m3 
C)  1030 kg/m3 
D)  960 kg/m3 
E)  56.1 kg/m3

Question 3

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. The outer shell has a density 9000 kg/m3.
(a) What is the mass of this sphere?
(b) What is the average density of this sphere?

Accepted Answer

(a)281 kg

Question 4

One day, while swimming below the surface of the ocean, you let out a number of bubbles of air from your mouth. As the bubbles rise toward the surface, their diameters will

Accepted Answer

A)  decrease. 
B)  stay the same. 
C)  increase. 
D)  increase for half of the bubbles and decrease for the other half. 
A)  decrease. 
B)  stay the same. 
C)  increase. 
D)  increase for half of the bubbles and decrease for the other half.

Question 5

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.

Accepted Answer

A)  5.55 × 107 Pa 
B)  8.88 × 107 Pa 
C)  1.11 × 108 Pa 
D)  2.22 × 108 Pa 
E)  3.33 × 108 Pa 
A)  5.55 × 107 Pa 
B)  8.88 × 107 Pa 
C)  1.11 × 108 Pa 
D)  2.22 × 108 Pa 
E)  3.33 × 108 Pa

Question 6

You have two identical pure silver ingots. You place one of them in a glass of water and observe it to sink to the bottom. You place the other in a container full of mercury and observe that it floats. Comparing the buoyant forces in the two cases you conclude that

Accepted Answer

A)  the buoyant force in the water is equal to that in mercury. 
B)  the buoyant force in the water is larger than that in mercury. 
C)  the buoyant force in water is smaller than the that in mercury. 
D)  the buoyant force in the water is zero and that in mercury is non-zero. 
E)  No conclusion can be made about the respective values of the buoyant forces. 
A)  the buoyant force in the water is equal to that in mercury. 
B)  the buoyant force in the water is larger than that in mercury. 
C)  the buoyant force in water is smaller than the that in mercury. 
D)  the buoyant force in the water is zero and that in mercury is non-zero. 
E)  No conclusion can be made about the respective values of the buoyant forces.

Question 7

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?

Accepted Answer

A)  2.0 × 105 kg/s 
B)  2.0 × 103 kg/s 
C)  3.0 × 105 kg/s 
D)  3.0 × 103 kg/s 
E)  3.0 × 102 kg/s 
A)  2.0 × 105 kg/s 
B)  2.0 × 103 kg/s 
C)  3.0 × 105 kg/s 
D)  3.0 × 103 kg/s 
E)  3.0 × 102 kg/s

State Bernoulli's principle.

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?

One day, while swimming below the surface of the ocean, you let out a number of bubbles of air from your mouth. As the bubbles rise toward the surface, their diameters will

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.

You have two identical pure silver ingots. You place one of them in a glass of water and observe it to sink to the bottom. You place the other in a container full of mercury and observe that it floats. Comparing the buoyant forces in the two cases you conclude that

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?

Introduction to Physics

One-Dimensional Kinematics

Vectors in Physics

Two-Dimensional Kinematics

Newtons Laws of Motion

Applications of Newtons Laws

Work and Kinetic Energy

Potential Energy and Conservation of Energy

Linear Momentum and Collisions

Rotational Kinematics and Energy

Rotational Dynamics and Static Equilibrium

Gravity

Oscillations About Equilibrium

Waves and Sound

Temperature and Heat

Phases and Phase Changes

The Laws of Thermodynamics

Electric Charges, Forces, and Fields

Electric Potential and Electric Potential Energy

Electric Current and Direct-Current Circuits

Magnetism

Magnetic Flux and Faradays Law of Induction

Alternating-Current Circuits

Electromagnetic Waves

Geometrical Optics

Optical Instruments

Physical Optics: Interference and Diffraction

Relativity

Quantum Physics

Atomic Physics

Nuclear Physics and Nuclear Radiation

Filters

Exam 15: Fluids

State Bernoulli's principle.

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?

One day, while swimming below the surface of the ocean, you let out a number of bubbles of air from your mouth. As the bubbles rise toward the surface, their diameters will

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.

You have two identical pure silver ingots. You place one of them in a glass of water and observe it to sink to the bottom. You place the other in a container full of mercury and observe that it floats. Comparing the buoyant forces in the two cases you conclude that

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?

Introduction to Physics

One-Dimensional Kinematics

Vectors in Physics

Two-Dimensional Kinematics

Newtons Laws of Motion

Applications of Newtons Laws

Work and Kinetic Energy

Potential Energy and Conservation of Energy

Linear Momentum and Collisions

Rotational Kinematics and Energy

Rotational Dynamics and Static Equilibrium

Gravity

Oscillations About Equilibrium

Waves and Sound

Temperature and Heat

Phases and Phase Changes

The Laws of Thermodynamics

Electric Charges, Forces, and Fields

Electric Potential and Electric Potential Energy

Electric Current and Direct-Current Circuits

Magnetism

Magnetic Flux and Faradays Law of Induction

Alternating-Current Circuits

Electromagnetic Waves

Geometrical Optics

Optical Instruments

Physical Optics: Interference and Diffraction

Relativity

Quantum Physics

Atomic Physics

Nuclear Physics and Nuclear Radiation

Filters

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.