1. (a) What is the available energy content, in joules, of a battery that operates a 2.00-W electric clock for 18 months? (b) How long can a battery that can supply 8.00 × 104 J run a pocket calculator that consumes energy at the rate of 1.00 × 10−3 W?
1. (a) What is the available energy content, in joules, of a battery that operates a 2.00-W electric clock for 18 months?
(b) How long can a battery that can supply 8.00 × 104 J run a pocket calculator that consumes energy at the rate of 1.00 × 10−3 W?
2. Albertine finds herself in a very odd contraption. She sits in a reclining chair, in front of a large, compressed spring. The spring, with spring constant k = 95.0 N/m, is compressed 5.00 m from its equilibrium position, and a glass sits 19.8 m from her outstretched foot.
(a) What is Albertine's initial potential energy before the spring is released?
(b) Assuming that Albertine's mass is 60.0 kg, for what value of μk, the coefficient of kinetic friction between the chair and the waxed floor, does she just reach the glass without knocking it over?
(c) The principle of conservation of energy states that energy is neither created nor destroyed. Describe the transformation of energy in this problem.
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