Answer:
82.3 J
Explanation:
PE = mgh
PE = (2.80 kg) (9.8 m/s²) (3.00 m)
PE = 82.3 J
Answer:
W = 16.5 Kj
P = 49.9 Watt
E = 16471
Explanation:
m = 73.5kg
t = 5min 30sec = (5×60) + 30 = 330sec
each step = 16.6cm = 0.166m
h = 135×0.166 = 22.41 m
g = 10 m/s²
(i) W = F × s = W × h = mgh
W = 73.5×10×22.41 = 16471.35
W = 16.5 Kj
(ii) Power = workdone/time
P = 16471.35/330
P = 49.9 Watt
(iii) The energy burnt in this process = 16471
The answer is B. The electric screw driver increased the work. You would rather have an electric one than doing it all by hand. Hope this helps!
The answer would be radiation because heat waves are being transferred