Question 1

If the sum of the external torques on a system is zero, there is

Accepted Answer

A)  a change in the system's moment of inertia. 
B)  no change in the system's moment of inertia. 
C)  a change in the system's angular momentum. 
D)  no change in the system's angular momentum. 
E)  a precessional angular velocity. 
A)  a change in the system's moment of inertia. 
B)  no change in the system's moment of inertia. 
C)  a change in the system's angular momentum. 
D)  no change in the system's angular momentum. 
E)  a precessional angular velocity.

Question 2

Vectors   and   lie in the xy plane. The vector product   $\times$ (   $\times$   ) could be represented by vector

Accepted Answer

A)    
B)    
C)    
D)    
E)    
A)    
B)    
C)    
D)    
E)

Question 3

A disc-shaped grindstone of mass 3.0 kg and radius 8.0 cm is spinning at 600 rev/min. After the power is shut off, a man continues to sharpen his axe by holding it against the grindstone until it stops 10 s later. What was the stone's initial kinetic energy when the power was turned off?

Accepted Answer

A)  19 J 
B)  3.8 $\times$ 10-3 J 
C)  4.8 $\times$ 10-5 J 
D)  1.9 $\times$ 10-3 J 
E)  2.4 $\times$ 10-2 J 
A)  19 J 
B)  3.8 $\times$ 10-3 J 
C)  4.8 $\times$ 10-5 J 
D)  1.9 $\times$ 10-3 J 
E)  2.4 $\times$ 10-2 J

Question 4

A disc rotates clockwise in the plane of the page. What is the direction of the angular momentum vector?

Accepted Answer

A)  clockwise 
B)  counterclockwise 
C)  into the page 
D)  out of the page 
E)  angular momentum has no direction 
A)  clockwise 
B)  counterclockwise 
C)  into the page 
D)  out of the page 
E)  angular momentum has no direction

Question 5

If the sum of the external torques acting on an isolated system of particles is zero, it must be true that

Accepted Answer

A)  the system can have no kinetic energy. 
B)  the angular momentum of the system does not change. 
C)  the system can have no angular velocity. 
D)  the system can have no linear velocity. 
E)  the angular momentum of the system must be continually decreasing. 
A)  the system can have no kinetic energy. 
B)  the angular momentum of the system does not change. 
C)  the system can have no angular velocity. 
D)  the system can have no linear velocity. 
E)  the angular momentum of the system must be continually decreasing.

Question 6

Consider Earth as a uniform sphere of diameter 12.7 $\times$ 106 m, with a mass of the 5.98 $\times$ 1030 kg, and a rotational period of 1 day. If Earth suddenly had a diameter of half this value without any loss of mass, calculate the new period of rotation.

Accepted Answer

A)  0.5 days 
B)  2.0 days 
C)  0.25 days 
D)  4.0 days 
E)  1.4 days 
A)  0.5 days 
B)  2.0 days 
C)  0.25 days 
D)  4.0 days 
E)  1.4 days

Question 7

A solid cylinder is spinning counterclockwise about a longitudinal axis when a net torque $\tau$ is applied, as shown. The cylinder

Accepted Answer

A)  speeds up. 
B)  slows down. 
C)  precesses about a vertical axis. 
D)  precesses about a horizontal axis. 
E)  does none of these. 
A)  speeds up. 
B)  slows down. 
C)  precesses about a vertical axis. 
D)  precesses about a horizontal axis. 
E)  does none of these.

If the sum of the external torques on a system is zero, there is

A disc-shaped grindstone of mass 3.0 kg and radius 8.0 cm is spinning at 600 rev/min. After the power is shut off, a man continues to sharpen his axe by holding it against the grindstone until it stops 10 s later. What was the stone's initial kinetic energy when the power was turned off?

A disc rotates clockwise in the plane of the page. What is the direction of the angular momentum vector?

If the sum of the external torques acting on an isolated system of particles is zero, it must be true that

Consider Earth as a uniform sphere of diameter 12.7 $\times$ 10⁶ m, with a mass of the 5.98 $\times$ 10³⁰ kg, and a rotational period of 1 day. If Earth suddenly had a diameter of half this value without any loss of mass, calculate the new period of rotation.

A solid cylinder is spinning counterclockwise about a longitudinal axis when a net torque $\tau$ is applied, as shown. The cylinder $A solid cylinder is spinning counterclockwise about a longitudinal axis when a net torque \tau is applied, as shown. The cylinder$

Systems of Measurement

Motion in One Dimension

Motion in Two and Three Dimensions

Newtons Laws

Applications of Newtons Laws

Work and Energy

Conservation of Energy

Systems of Particles and Conservation of Linear Momentum

Rotation

Gravity

Static Equilibrium and Elasticity

Fluids

Oscillations

Wave Motion

Superposition and Standing Waves

Temperature and the Kinetic Theory of Gases

Heat and the First Law of Thermodynamics

The Second Law of Thermodynamics

Thermal Properties and Processes

Filters

Exam 10: Conservation of Angular Momentum

If the sum of the external torques on a system is zero, there is

Vectors and lie in the xy plane. The vector product ×\times× ( ×\times× ) could be represented by vector

A disc-shaped grindstone of mass 3.0 kg and radius 8.0 cm is spinning at 600 rev/min. After the power is shut off, a man continues to sharpen his axe by holding it against the grindstone until it stops 10 s later. What was the stone's initial kinetic energy when the power was turned off?

A disc rotates clockwise in the plane of the page. What is the direction of the angular momentum vector?

If the sum of the external torques acting on an isolated system of particles is zero, it must be true that

Consider Earth as a uniform sphere of diameter 12.7 ×\times× 106 m, with a mass of the 5.98 ×\times× 1030 kg, and a rotational period of 1 day. If Earth suddenly had a diameter of half this value without any loss of mass, calculate the new period of rotation.

A solid cylinder is spinning counterclockwise about a longitudinal axis when a net torque τ\tauτ is applied, as shown. The cylinder

Systems of Measurement

Motion in One Dimension

Motion in Two and Three Dimensions

Newtons Laws

Applications of Newtons Laws

Work and Energy

Conservation of Energy

Systems of Particles and Conservation of Linear Momentum

Rotation

Gravity

Static Equilibrium and Elasticity

Fluids

Oscillations

Wave Motion

Superposition and Standing Waves

Temperature and the Kinetic Theory of Gases

Heat and the First Law of Thermodynamics

The Second Law of Thermodynamics

Thermal Properties and Processes

Filters

Consider Earth as a uniform sphere of diameter 12.7 $\times$ 10⁶ m, with a mass of the 5.98 $\times$ 10³⁰ kg, and a rotational period of 1 day. If Earth suddenly had a diameter of half this value without any loss of mass, calculate the new period of rotation.

A solid cylinder is spinning counterclockwise about a longitudinal axis when a net torque $\tau$ is applied, as shown. The cylinder $A solid cylinder is spinning counterclockwise about a longitudinal axis when a net torque \tau is applied, as shown. The cylinder$