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3 years ago

Calculate the kinetic energy of a 100.0-kg meteor approaching the Earth at a speed of 10.0 km/s. Remember that 1 km = 1000 m.

2 answers:

8 0

Kinetic Energy = (1/2) (mass) (speed squared)

Mass = 100 kg
Speed = 10 km/s = 10,000 m/s
Speed squared = 100,000,000 m²/s²

1/2 (M)(V²) = 1/2 (100) (100,000,000) = 5,000,000,000 joules (5 x 10⁹ J)

That's 5 billion joules.

That's the amount of energy a 100-watt light bulb uses in 579 days.

olchik [2.2K]3 years ago

5 0

KE=1/2 x mass x speed^2
Substitute:

KE=1/2 x 100 x 10000^2
5000000000J of KE
So either 5 gigajoules
Or 5x10^9J

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The situation is same as when a book is pushed with an increasing force on a table; When the force is low, book doesn't move, until that under a given force starts moving, and then it goes on movement even if the force decreases a bit.

The physical explanation for this, that friction force adopts any value needed to avoid to move the object, till a limit value is achieved, called static friction force, equal to the normal force times the static friction coefficient.

Once in movement, the kinetic friction coefficient replaces the static one , and in general is lower than the static one, so the force diminishes.

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F_g = m g sin θ

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Beyond this limit angle, F_g (remaining the same for a given angle) is greater than the kinetic friction force, and the box slides.

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Learn more about watermark here:.

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