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2 years ago

11

Bill has a mass of 85 kg and is skating west. He increases his speed from 3 m/s to 5 m/s by applying a force for 3 seconds. What

force did he apply?

1 answer:

likoan [24]2 years ago

4 0

F = ma
F = 85×(5-3)÷3
F = 85×(2÷3)
F = 85×0.667
F = 56.67N

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In a car engine, gasoline is burned to create mechanical energy. Which of the following statements is true? Some energy is lost

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energy is v v v often lost as heat.

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Vehicle crumple zones are designed to absorb energy during an impact by deforming to reduce energy transfer to the occupants. Ho

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Answer:

change in KE = -12.95 Btu

Explanation:

given data

mass = 3000-lbm

velocity of vehicle initial vi = 10 mph = 14ft/s

velocity of vehicle final vf = 0 mph = 0 ft/s

solution

as here for crumple zone to protected zone it will absorb kinetic energy

so change in KE is related here initial and final velocity that is

change in KE = 0.5 × m × (vf² - vi² ) .................1

put here value and we get

change in KE = 0.5 × 3000 × (0² - 14.7² )

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2 years ago

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Answer:

formed 4.6 billion years ago

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Explanation:

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To write it into scientific notation, shift decimal before 3 such that,

$V=\dfrac{5328}{100}$

No multiply and divide by 10. So,

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2 years ago

If a 0.15 kg ball on the end of a string is swung in a vertical circle of radius .6 meters and makes 2 revolutions per second, w

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Answer:

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where v = speed in m/s

v = radius x rpm x 0.10472 = 0.6 x 120 x 0.10472 = 7.54 m/s

we can now substitute the value of v into T' = $\frac{mv^{2} }{r} + mg$

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2 years ago