I'm new to brainy, but here is my question.
2 answers:
Answer: 680 J
Explanation:
Andre's mechanical energy is given by:
where
K is the kinetic energy
U is the gravitational potential energy
The kinetic energy in this case is zero, because Andre is sitting, so its speed is zero: v=0, and the kinetic energy is
The gravitational potential energy is instead
So, the total mechanical energy is
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Answer:
Kinetic energy of diver at 90% of the distance to the water is 9000 J
Explanation:
Let d is the distance between the position of the diver and surface of the pool.
Initially, the diver is at rest and only have potential energy which is equal to 10000 J.
As the diver dives towards the pool, its potential energy is converting into kinetic energy due to law of conservation of energy, as total energy of the system remains same.
Energy before diving = Energy during diving
(Potential Energy + Kinetic Energy) = (Kinetic Energy + Potential Energy)
When the diver reaches 90% of the distance to the water, its kinetic energy
is 90% to its initial potential energy, as its initial kinetic is zero,i.e.,
K.E. =
K.E. = 9000 J