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March 30, 2015

March 30, 2015

Posted by **john** on Sunday, June 17, 2012 at 4:30am.

1. BC Hydro charges $5.91 per kWh. How long does it take a 100 W light bulb to use up $1.00 of energy? (answer = 1.7h)

2. A small bag of chips contains 230 Calories (1000 calories = 1 calorie = 4.19 kJ). To what max. height could a 70 kg person climb with this amount of energy?

Thanks :)

- Physics -
**Elena**, Sunday, June 17, 2012 at 5:31pmP=100 W =0.1 kW

0.1•t kWh → $1

1 kWh → $5.91

t=1/0.1•5.91 =1.7 h

2.

1000 calories = 1 kilocalorie = 4.19 kJ

mgH=70•9.8•H = 230 C = 963 J

H= 963/70•9.8 =1.4 m

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