Two Identical Cylindrical Discs Have a Common Axis

question 24

Multiple Choice

Two identical cylindrical discs have a common axis.Initially one of the discs is spinning.When the two discs are brought into contact,they stick together.Which of the following is true?

• A)The total kinetic energy and the total angular momentum are unchanged from their initial values.
• B)Both the total kinetic energy and the total angular momentum are reduced to half of their original values.
• C)The total angular momentum is unchanged,but the total kinetic energy is reduced to half its original value.
• D)The total angular momentum is reduced to half its original value,but the total kinetic energy is unchanged.
• E)The total angular momentum is unchanged,and the total kinetic energy is reduced to one-quarter of its original value.

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