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Mashcka [7]
3 years ago
11

A frictionless pulley used to lift 8000N of concrete. What is the minimum effort required to raise the block

Physics
1 answer:
rusak2 [61]3 years ago
3 0

Answer: 8000N

Explanation: since it is frictionless that means it has 100% efficiency therefore the mechanical advantage is 1 meaning the load equals to the effort

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A small object of mass 3.82 g and charge -16.5 µC is suspended motionless above the ground when immersed in a uniform electric f
horrorfan [7]

Answer:

2271.16N/C  upward

Explanation:

The diagram well illustrate all the forces acting on the mass. The weight is acting downward and the force is acting upward in other to balance the weight.since the question says it is motionless, then indeed the forces are balanced.

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W=mg\\g=9.81m/s^{2}

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W=0.00382kg*9.81m/s^{2}

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To calculate the electric field,

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Since the charge on the mass is negative, in order to generate upward force, there must be a like charge below it that is  repelling it, Hebce we can conclude that the electric field lines are upward.

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