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IRINA_888 [86]
2 years ago
9

What is the maximum velocity at which a 60-watt motor can lift an 8.5-kg mass upward?

Physics
1 answer:
enyata [817]2 years ago
3 0

Pick <em>choice-A</em> .

Weight of a mass = (mass) x (gravity)

Earth gravity = (9.8 m/s )

Weight of a mass = (9.8 x mass) Newtons

Work = (force) x (distance)

Power = (work done) / (time to do the work)

Weight of this mass = (8.5 kg) x ( 9.8 m/s ) = 83.3 Newtons

Work to lift it 1 meter = (83.3 N) x (1 m) = 83.3 Joules

Power to lift it 1 meter/sec = 83.3 Joule/sec = 83.3 watt

Power to lift it ' v ' meters/sec = 83.3v watts

In this problem ...

83.3 v watts = 60 watts

v =  60/83.3 m/s

<em>v =  0.72 m/s</em>

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Answer:

<em>2.78m/s²</em>

Explanation:

Complete question:

<em>A box is placed on a 30° frictionless incline. What is the acceleration of the box as it slides down the incline when the co-efficient of friction is 0.25?</em>

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\theta = 30^0\\\mu = 0.25\\g = 9.8m/s^2

Required

acceleration of the box

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gsin\theta - \mu g cos\theta = a_x\\

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