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Nuclear Fission and Fusion – A Facebook conversation
Find below a conversation between Master Deepak, PUC student and Mr. Mathew Abraham, Physics teacher.
Deepak asked: “nuclear fusion or fission in which of these energy released is more and why?”
Nuclear fusion requires very high temperature to start. It is difficult to maintain such a huge temperature (of the order of million degrees).

Research is going on to construct nuclear fusion reactor

Bouncing ball and energy dissipation problem
Please help me with the question below.. I’m totally confused!
A player throws a ball of mass 0.6 kg into the air, to a height of 4.0 m above the ground. The ball then falls to the ground. During the impact, 22% of the ball’s energy is lost. Calculate the height to which the ball rises after the bounce. Your assistance will be appreciated..
Mustafa posted
Answer:
m= 0.6 kg
h = 4.0 m
Energy = mgh
During impact 22% energy is lost. Therefore, energy remaining = 88%
Therefore the energy with which the ball rebounds = 24 x 88/100 J
This is equal to the potential energy at the highest point after bouncing
If the new height is h’
mg h’ = 88% mgh
h’ = 0.88 x h = 0.88 x 4.0 =3.52 m
If you have further doubts, please ask
Related articles
- Calculate velocity and direction of a ball to ball collision based on mass and bouncing coefficient (stackoverflow.com)
- Rainfall Dissipates Energy via Friction with Air (scientificamerican.com)
