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3 years ago

James is lifting a weight of 10 kg. He is doing work

Physics

2 answers:

Goshia [24]3 years ago

7 0

Against the force of gravity

marta [7]3 years ago

3 0

Against the force of gravity

Explanation: gravity is a force that pulls down on all objects. James lifting a weight means he is going the opposite direction of the billing force, so the answer is B. Against the force of gravity

I hope this helped

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In the figure, a weightlifter's barbell consists of two identical small but dense spherical weights, each of mass 50 kg. These w

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The moment of inertia is $24.8 kg m^2$

Explanation:

The total moment of inertia of the system is the sum of the moment of inertia of the rod + the moment of inertia of the two balls.

The moment of inertia of the rod about its centre is given by

$I_r = \frac{1}{12}ML^2$

where

M = 24 kg is the mass of the rod

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Substituting,

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The moment of inertia of one ball is given by

$I_b = mr^2$

where

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So we have

$I_b = (50)(0.48)^2=11.5 kg m^2$

Therefore, the total moment of inertia of the system is

$I=I_r + 2I_b = 1.84+ 2(11.5)=24.8 kg m^2$

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Please kindly check attachment for the step by step solution of the given problem.

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