-- Use power when you're dealing with an amount of energy
AND the time it took. Because ...
Power =
(amount of work done or energy moved)
divided by
(time to do the work or move the energy from one place to another).
-- Use an energy equation when you have to figure out an amount of energy.
It would come up in situations like this:
. . . . . how much work is done (work is energy)
. . . . . energy needed to melt some amount of ice
. . . . . energy needed to boil some amount of water
-- Use an efficiency equation when you're dealing with
. . . . . the amount of work, or energy, or power going in
. . . . . AND the amount of work, or energy, or power coming out.
There are a ton of types so here are the most important ones
Nuclear energy- potential
Heat/ Thermal energy- kinetic
Mechanical energy - potential
Electromagnetic- kinetic
Chemical- potential
Answer:
18695271.3209 J
989.167794757 s
Explanation:
r = Radius =
N = 2970 rpm
m = Mass of flywheel = 1070 kg
P = Power =
Moment of inertia
Angular speed
Kinetic energy
The kinetic energy is 18695271.3209 J
Time is given by
The time taken is 989.167794757 s
Period = (1/frequency) .
If frequency is 100 per second, then
Period = (1) / (100 per second) = 0.01 second .