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3 years ago

A mass of 2000 kg is raised 5 m in 10 seconds. What is the kinetic energy of the mass at that height?

Physics

1 answer:

madam [21]3 years ago

3 0

<h3><u>Answer;</u></h3>

98,000 joules

<h3><u>Explanation;</u></h3>

Kinetic is the energy possessed by a body in motion; while kinetic energy is the energy possessed by a body while at rest.

Potential energy is given by; mgh, where m is the mass, g the gravity, 9.8 m/s² and h is the height.

Energy can be transformed from one form to another and can neither be created or destroyed.

Therefore;

Potential energy = 2000 × 5 × 9.8

= 98,000 joules

Therefore, the kinetic energy will still be 98,000 joules, when the body is in motion.

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Answer:

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$\sum f_{y} = 0$

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From the diagram, $r = Lsin \theta$

$a = w^{2} L sin \theta$

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$a = \frac{4\pi ^{2}L sin \theta }{T^{2} }$ ............(3)

Put (3) into (2)

$\tau sin \theta = \frac{4\pi ^{2}m L sin \theta }{T^{2} }$

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L = 30 ft

T = 3 secs

$\tau = \frac{4\pi ^{2}*1.875*30 }{0.3^{2} }$

$\tau = 246.74 lbs$

since 246.74 lbs > 200 lbs, it is not safe because the stationary chair will creak

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3 years ago

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Answer:

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Explanation:

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Answer:

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