#1 A microwave oven has a power requirement of 1,261 W. A frozendinner 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 itcost 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 (verticalheight of 2.6 m) in 23 s.
(a) How much work is done?
__________J
(b) What is the power output of the student?
__________W
