#1 A microwave oven has a power requirement of 1,261 W. A frozen dinner requires 4.1...

#1 A microwave oven has a power requirement of 1,261 W. A frozen dinner requires 4.1 min to heat on full power.

(a) How much electrical energy (in kWh) is used?
_________kWh

(b) If the cost of electricity is 13¢ per kWh, how much does it cost to heat the dinner? (Do not round your final answer. Fractional cent values are acceptable.)
______________¢

#2 - A student who weighs 556 N climbs a stairway (vertical height of 2.6 m) in 23 s.

(a) How much work is done?
__________J

(b) What is the power output of the student?
__________W

Solutions

Expert Solution

The concept used is of energy consumed and power , initially i calculate the energy consumed by the dinner in joule after that i converted it in to kWh and i also mention the meaning of one kWh which means one unit of electricity , as cost of one unit of electricity is given then i used it to calculate the cost of electricity .

kindly upvote my answer , if you like by clicking on the like button.

genius_generous answered 1 year ago

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