When you get into a Parked car in the summer time, the metal clip of the seatbelt is often too hot to touch, while the seatbelt
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Answer:
100000J
Explanation:
Given parameters:
Power of the crane = 25000W
Time taken = 4s
Unknown:
Work done by the crane = ?
Solution:
Power is the rate at which work is being done. It is expressed as:
Power =
Work done = Power x Time taken
Now insert the parameters and solve;
Work done = 25000 x 4 = 100000J
Answer:
w = -3.8KJ
Explanation:
The work done on a system which is under an external pressure
P =
P = 1.5 atm
ΔV = 40 − 15 = 25 L
w = - P ΔV = -1.5 (25) = - 37.5 L.atm
w = 37.5 X 101.325 J ≈ − 3800 J = −3.8 KJ