AP Physics 1 Question 407: Answer and Explanation
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5. A simple pendulum is constructed with a 3 kg mass attached to the ceiling with a 25 cm long string. What is the magnitude of the restoring force acting on the mass when the angle to the vertical is 30° ?
- A. 1.5 N
- B. 3 N
- C. 6 N
- D. 15 N
Correct Answer: D
The magnitude of the restoring force of a simple pendulum is given by the equation:
Frestoring = mgsinθ = 3 kg (10 m/s2)(sin30°) = 15 N