Physics
A simple pendulum while oscillating rises to a maximum vertical height of 7 cm from its rest position where it reaches its extreme position on one side. The mass of the bob of simple pendulum is 400 g and g = 10 m/s2. The total energy of the simple pendulum at any instant while oscillating is:
- 0.28 J
- 2.8 J
- 28 J
- 28000 J
Work, Energy & Power
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Answer
0.28 J
Reason — Given,
m = 400 g = 0.4 kg
g = 10 m/s2
h = 7 cm = 0.07 m
The potential energy of the pendulum at its extreme position (maximum height) is : mgh
and kinetic energy at this point = 0
Substituting we get,
Total energy = PE + KE = mgh + 0 = (0.4 x 10 x 0.07) + 0 = 0.28 J
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