The Rotating Systems Shown in the Figure Differ Only in That

question 109

Multiple Choice

The rotating systems shown in the figure differ only in that the two identical movable masses are positioned a distance r from the axis of rotation (left) , or a distance r/2 from the axis of rotation (right) . You release the hanging blocks simultaneously from rest, and call t_L the time taken by the block on the left and t_R the time taken by the block on the right to reach the bottom, respectively. The bar, pulley, and rope have negligible mass, the rope does not slip, and there is no friction in the axle of the pulley. Under these conditions

• A) t_L = t_R.
• B) t_L = t_R.
• C) t_L = t_R.
• D) t_L = 2t_R.
• E) t_l = 4t_R.

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Definitions:

Cash Payback Period

The time it takes for an investment to generate an amount of cash equal to the initial investment cost.

Negligible Residual Value

A term used to describe an asset's end-of-life value that is considered to be insignificantly small or practically zero.

Cash Payback Period

The cash payback period is the duration of time it takes for an investment to generate enough cash flow to recover its original cost.

Residual Value

The estimated salvage value of an asset at the end of its useful life.