4. An electric toaster is rated at 500 watts. Determine the amount of electrical

energy it converts to heat energy in one minute.

80.3 J

B)

500 J

C)

3,000 J

D)

30,000 J

60000 joules

Explanation:

power=500watts

Time=2minutes=120seconds

Heat energy=power x time

Heat energy=500 x 120

Heat energy=60000J

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the motion of a pendulum is a classic example of mechanical energy conservation. a pendulum consists of a mass (known as a bob ) attached by a string to a pivot point. as the pendulum moves it sweeps out a circular arc, moving back and forth in a periodic fashion.