A Child Applies the Brakes on a Bicycle by Applying $60 ^ { \circ }$

question 27

Multiple Choice

A child applies the brakes on a bicycle by applying a downward force of 25 pounds on the pedal when the crank makes a $60 ^ { \circ }$ angle with the horizontal (see figure) . The crank is 6 inches in length. Find the torque at $P$ . Round your answer to two decimal places.

• A)12.50 ft-lb
• B)6.25 ft-lb
• C)75.00 ft-lb
• D)10.83 ft-lb
• E)21.65 ft-lb

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Definitions:

Ordinary Annuity

A sequence of identical disbursements done at consecutive period ends over a predefined duration.

Perpetuity

A type of annuity that generates an infinite series of future payments, theoretically lasting forever.

Compounded Quarterly

The process of calculating interest on both the initial principal and the accumulated interest over previous quarters, increasing the total amount at a quarterly rate.

Ordinary Perpetuity

A series of equal cash flows that occur at the end of each period forever.