A Ball of Mass 5

question 30

Multiple Choice

A ball of mass 5.0 kg is suspended by two wires from a horizontal arm that is attached to a vertical shaft, as shown in the figure. The shaft is in uniform rotation about its axis. The rate of rotation is adjusted until the tensions in the two wires are EQUAL. At that speed, the radial acceleration of the ball is closest to

• A) 4.9 m/s².
• B) 5.9 m/s².
• C) 6.9 m/s².
• D) 7.9 m/s².
• E) 9.9 m/s².

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Definitions:

Treynor Measure

A performance metric that evaluates the returns of an investment portfolio or fund relative to its market risk.

Standard Deviation

A statistical measure of the dispersion or variability of a set of data points or investment returns around the mean.

Beta

A quantification of the risk and fluctuations experienced by a security or portfolio when compared to the general market.

Treynor Measure

A performance metric for determining how well an investment compensates the investor for taking a particular level of risk, accounting for systematic risk.