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1 answer:
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Answer:
0.017 s
Explanation:
The period of a periodic signal is defined as the reciprocal of the frequency:
where
T is the period
f is the frequency
For the electrical power, the frequency is
f = 60.0 Hz
Substituting into the previous equation, we find the period:
Answer:
P = 147,75 W
Explanation:
A man whose mass is 59.1kg climbs up 30 steps of a stair each step is 25 cm high
Height at 30 steps , h=30×2.5= 7.5 m
Change in potential energy , =mgh=59.1×10×7.5 = 4432.5 J
So, Work done by the man , W= 4432.5J
Power used , P=
P = 4432.5 /30
P = 147,75 W
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