A chocolate bar 40grams has 210 calories. approximately how, Ask an Expert

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Q1. A chocolate bar (40grams) has 210 Calories. Approximately how long would the 100 watt light bulb shine if we convert all the chocolate's energy into electricity (100% efficiently)? (Remember 1Cal = 1000 cal = 4200 joules)

Q2. A 31 kg child on a 3.00 m long swing is released from rest while the ropes of the swing make an angle of 29.0° with the vertical.

(a) Neglecting friction, find the child's speed at the lowest position.

(b) If the speed of the child at the lowest position is 2.6 m/s, what is the mechanical energy lost due to friction?

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