A2.0 kg pendulum has an initial total energy of 20 j. calculate the energy lost as heat if the pendulum is 0.10 m high and is traveling at 4.0 m/s. a) 2.0j b) 18j c) 14j d)16j

The correct answer is (A) 2.0 J

Total energy of the pendulum is the sum of its kinetic and potential energy. At the instant of time, when the pendulum is at a height h and has a speed v, Its energy is given by,

Substitute 2.0 kg for m, the mass of the pendulum, 9.81 m/s² for g, the acceleration due to gravity, 0.10 m for h and 4.0 m/s for v.

The pendulum has an initial energy of 20 J. the energy lost is given by,

Thus, the energy lost by the pendulum is (A) 2.0 J

1. B, 2. C, 3. B, 4. A, 5. A, 6. D, 7. B, 8. D, 9. B

Explanation:

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