Answer:
160 watts.
Explanation:
Remark
Power = Work / Time
Work = F * d
Note: Since he is running up stairs he is doing work against gravity.
Givens
- m = 50000 g kg / 1000 grms
- m = 50000 / 1000 = 50 kg
- h = 4 m
- time = 12.5 seconds
- g = 10 m/s^2
Formula
- P = W * d/t
- W = m*g *d / t
Solution
- P = 50kg * 10 m/s^2 * 4 m / 12.5
- <em><u>P = 160 watts. </u></em>
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Answer:
16 m / s
Explanation:
Average kinetic energy of one mole of a gas is given by the expression
K.E = 3 / 2 R T { T is absolute temperature of the gas }
Putting the values , we get
4070 = 3 / 2 X 8.312 X T
T = 326.35 K
Under similar condition temperature of oxygen will also be same . So temperature of oxygen gas will be 326.35 K.
Now ,RMS value of a gas =
T is absolute temperature of gas and M is molecular mass.
Molecular mass of oxygen is 32 gm . T is 326.35
RMS speed =
= 16 m / s . approx.
A
Explanation:
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1) Assuming an adult person has an average mass of m=80 kg, and assuming it takes about 30 seconds to climb 5 meters of stairs, the energy used by the person is
So the power output is
And since the estimate we made is very rough, we can say that the power output of the person is comparable to the power output of the light bulb of 100 W.
2) Based on the results we found in the previous part of the exercise, since the power output of the person is comparable to the power output of 1 light bulb of 100 W, we can say that the person could have kept burning only one 100-W light bulb during the climb.