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adelina 88 [10]
3 years ago
5

A person, with a mass of 50.0 kg, stands on a weighing scale in a lift which is moving

Physics
1 answer:
svet-max [94.6K]3 years ago
6 0

Answer:

D

Explanation:

Because I just had that answer

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A block of mass m is attached to a rope wound around the outer rim of a disk of radius R and moment of inertia I, which is free
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Answer:

Explanation:

I is the moment of inertia of the pulley, α is the angular acceleration of the pulley and T is the tension in the rope. Let a is the linear acceleration.

The relation between the linear acceleration and the angular acceleration is

a = R α   .... (1)

According to the diagram,

T x R = I x α

T x R = I x a / R      from equation (1)

T = I x a / R²      .... (2)

mg - T = ma    .... (3)

Substitute the value of T from equation (2) in equation (3)

mg - \frac{Ia}{R^{2}}=ma

a=\frac{mg}{m+\frac{I}{R^{2}}}

T is the acceleration in the system

Substitute the value of a in equation (2)

T = \frac{I}{R^{2}}\times \frac{mg}{m+\frac{I}{R^{2}}}

T=\frac{I\times mg}{I+mR^{2}}

This is the tension in the string.

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