Physics

Problem

A simple pendulum consists of a

0.40\,\text{kg}

bob suspended by a light string of length

1.2\,\text{m}

. The bob is released from rest after being displaced through an angle of

15^\circ

. Which of the following pairs correctly gives (i) the magnitude of the restoring force at the release point and (ii) whether the small-angle (linear) approximation is acceptable at this angle? a)

1.0\,\text{N}

; approximation acceptable b)

1.0\,\text{N}

; approximation not acceptable c)

1.7\,\text{N}

; approximation not acceptable d)

2.5\,\text{N}

; approximation acceptable

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