Energy, work &power physics help!!?
50. While running, a person dissipates about 0.60 J of mechanical energy per step per kilogram of body mass. If a 60-kg person develops a power of 70 W during a race, how fast is the person running? Assume a running step is 1.5 m long.
51. Water flows over a section of Niagara Falls at the rate of 1.2 * 10^6 kg/s and falls 50 m (Fig P5.51). How much power is generated by the falling water?
show me step by step how to get the answer plz
- christianLv 51 decade agoBest Answer
(50) Want to get to m/s:
.6J/(step)(kg)* 60 kg = 36J/step
(36J/step) * (1 step)/ 1.5 meters =24J/m
potential energy=mass*gravity acceleration*height
We don't have mass but we have mass/s, which is good enough because if we pick a time, say 10 secs worth of water, then we would have to divide by 10 anyway to get the power.
Check the math, etc. It's been a while...
- bigbyLv 43 years ago
completely accept as true with ryan obes! and that i've got been given an A too! yet anyhow... artwork= stress x distance moved interior the direction of stress potential= artwork completed, artwork= potential transferred potential=artwork completed/ time = potential transferred/ time Plus a lot extra! those are only the main difficulty-loose ones!