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Sever21 [200]
3 years ago
15

A 5-kg concrete block is lowered with a downward acceleration of 2.8 m/s2 by means of a rope. The force of the block on the Eart

h is: A. 35 N, down B. 35 N, up C. 14 N, down D. 14 N, up E. 49 N, up
Physics
1 answer:
maksim [4K]3 years ago
5 0

When the body touches the ground two types of Forces will be generated. The Force product of the weight and the Normal Force. This is basically explained in Newton's third law in which we have that for every action there must also be a reaction. If the Force of the weight is pointing towards the earth, the reaction Force of the block will be opposite, that is, upwards and will be equivalent to its weight:

F = mg

Where,

m = mass

g = Gravitational acceleration

F = 5*9.8

F = 49N

Therefore the correct answer is E.

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Answer:

v = 1.98 mph

Explanation:

Given that,

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2 years ago
A uniform cylindrical grindstone has a mass of 10 kg and a radius of 12 cm. (a) What is the rotational kinetic energy of the gri
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Answer:

a) KE = 888.26J

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Explanation:

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Replacing these values into the energy balance:

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