Answer:
7.35 J
Im assuming, upon answering the question, that the gravity in this scenario is 9.8? As 9.8 is the gravitational force upon the earth.
Because we should convert units within the metric system
Answer:
the decrease in energy is due to a transformational in internal energy of the body in the rebound.
Explanation:
For this exercise we can calculate the initial and final mechanical energy
Em₀ = U = m g y₁
= U = m g y₂
we look for the variation of the energy
ΔEm = Em_{f} - Em₀
ΔEm = m g (y_{f} -y₀)
ΔEm = m g (0.86 -1.2)
ΔEm = -3.332 m
We can see that there is a decrease in mechanical energy, this is transformed into internal energy of the ball during the impact with the ground, this energy can be formed by several factors such as a part of the friction with the surface, an increase in body temperature or a deformation of the body; there may be a contribution from several of these factors.
In conclusion the decrease in energy is due to a transformational in internal energy of the body in the rebound.
1 watt means 1 joule of energy per second
The food processor uses 1,150 joules of energy per second.
The blade uses 950 joules per second to slice, dice, and puree.
The rest of the energy goes to heat the appliance's motor, or
overcome friction in the blade's bearings, etc. How much energy
does NOT go into slicing and pureeing ?
(1,150 watts) - (950 watts) = 200 joules per second
1 minute = 60 seconds
2 minutes = 120 seconds
Energy wasted in 2 minutes =
(200 joules/second) x (120 seconds) = <em>24,000 joules</em>
That's enough energy to operate a 34-watt CFL (curly) light bulb
for 11 minutes 46 seconds.