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Hunter-Best [27]
3 years ago
13

Which describes the relationship between potential and kinetic energy of a ball thrown up in the air as it falls back to the gro

und?
A.
Gravitational potential energy increases; kinetic energy increases.


B.
Kinetic energy equals gravitational potential energy.


C.
Kinetic energy increases; gravitational potential energy decreases.


D.
The mass of the ball is required to answer this.
Physics
1 answer:
Gekata [30.6K]3 years ago
7 0
The answer is c, because ball is falling so its gravitationl potential energy decreases, but it kinetic energy increases. Energy is always conserved.
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Additional Problem: A simple pendulum, consisting of a string (of negligible mass) of length L with a small mass m at the end, i
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Answer:

a)   v = √ 2gL  abd  b)  θ = 45º

Explanation:

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Highest starting point

       Em₀ = U = mg h

Final point. Lower

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      Em₀ = Em₂

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b) the definition of power is the relationship between work and time, but work is the product of force by displacement

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If we use Newton's second law, with one axis of the tangential reference system to the trajectory and the other perpendicular, in the direction of the rope, the only force we have to break down is the weight

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This force is parallel to the movement and also to the speed, whereby the scalar product is reduced to the ordinary product

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The equation that describes the pendulum's motion is

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Let's replace

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    P = Wθ₀ sin θ cos θ

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    2θ = 90

    θ = 45º

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