A student who weighs 546 N climbs a stairway ( vertical heightof 3.3 m) in 30 s.

Question

A student who weighs 546 N climbs a stairway ( vertical heightof 3.3 m) in 30 s. How much work is done_______J What is the power output of the student? _________J A microwave oven has a power requirement of 1255 W. A frozendinner requires 4.6 min to heat on ful power. How much electrical energy ( in kWh ) isused?________kWh If the cost of electricity is 12 cents per kWH, how much doesit cost to heat the dinner?_________cents A student who weighs 546 N climbs a stairway ( vertical heightof 3.3 m) in 30 s. How much work is done_______J What is the power output of the student? _________J A microwave oven has a power requirement of 1255 W. A frozendinner requires 4.6 min to heat on ful power. How much electrical energy ( in kWh ) isused?________kWh If the cost of electricity is 12 cents per kWH, how much doesit cost to heat the dinner?_________cents

Explanation / Answer

A student who weighs 546 N climbs a stairway ( vertical heightof 3.3 m) in 30 s. How much work is done W = wh = 546 *3.3 = 1801.8 J What is the power output of the student? P =W / t = 1801.8 / 30 = 60.06 J/s A microwave oven has a power requirement of 1255 W. A frozendinner requires 4.6 min to heat on ful power. How much electrical energy ( in kWh ) is used? E = P t = 1255 * 4.6 = 5.773 kW - min =0.09621kWh If the cost of electricity is 12 cents per kWH, how much doesit cost to heat the dinner? cost = 1.1546cents

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