Potential energy is the energy possessed by a body or an object while at rest while kinetic energy is the energy while the body is at motion.
Potential energy is given by Mgh where m is the mass of the object, g is the gravitational acceleration (a constant) and h is the height.
Therefore, potential energy varies directly proportional to the mass of the object and the height.
Thus in this case, an increase in the mass of the box by 15 kg and raising the height of the box by 20 feet, will result to an increase in potential energy of the box.
E. i - Energy (w) = Power x Time
Energy = 40 x 3600
= 14,400 joules
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Answer:
Check below for the explanations required
Explanation:
The following processes/events take place in the cooling of a fluid.
- A reduction in the kinetic energy of the molecules of the fluid
- The molecular speed reduces ( i.e.there will be a reduction in the speed at which the molecules move)
- The cohesive force between the molecules will increase ( i.e the molecules will no longer be drifted apart, they will now move closer to each other
- The temperature of the fluid reduces as it cools down
- There will be an increase in density
Force = mass × acceleration
Now, keeping this formula in mind you can find the mass as follows;
= 35 = m × 3
= 35/3 = m
= 11.6 kg = m
And yeah its done!:)
Measuring the heat of chemical reactions or physical changes.