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butalik [34]
3 years ago
14

Calculate the potential energy of a 20-kg sled at 40 meters

Physics
2 answers:
irakobra [83]3 years ago
5 0

Answer: 7840N

Explanation:

Given that

Potential energy = ?

Mass of sled = 20-kg

Distance = 40 meters

Acceleration due to gravity = 9.8m/s^2

Recall that potential energy is the energy possessed by a body at rest

i.e potential energy = mass m x acceleration due to gravity g x distance h

P.E = mgh

P.E = 20kg x 9.8m/s^2 x 40m

P.E = 7840N

Thus, the potential energy of the sled is 7840N

Natali [406]3 years ago
4 0
The above answer is correct however gravitational potential energy is measured in joules. So the final answer would be 7840 J (joules) not newton’s.
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Delivery trucks that operate by making use of energy stored in a rotating flywheel have been used in Europe. The trucks are char
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Answer:

KE = 2.535 x 10⁷ Joules

Explanation:

given,

angular speed of the fly wheel = 940 rad/s

mass of the cylinder = 630 Kg

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I = \dfrac{1}{2}mr^2

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kinetic energy of the fly wheel

KE = \dfrac{1}{2}I\omega^2

KE =\dfrac{1}{2}\times 574\times 940^2

KE = 2.535 x 10⁷ Joules

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Explanation:

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