Answer:

1) KE of the system = 1/2(Iw^2)

2) the torque T that must be applied to keep it still must be equal to the torque of rotation. This is equal to

T = (Iw^2)/2©

Where;

I = moment of inertia of the body

W = angular velocity of the body

© = angle of rotation in rad

Explanation:

Detailed explanation and calculation is shown in the image below

**Answer : The specific heat capacity of the alloy **

**Explanation :**

**In this problem we assumed that heat given by the hot body is equal to the heat taken by the cold body.**

where,

= specific heat of alloy = ?

= specific heat of water =

= mass of alloy = 21.6 g

= mass of water = 50.0 g

= final temperature of system =

= initial temperature of alloy =

= initial temperature of water =

Now put all the given values in the above formula, we get

Therefore, the specific heat capacity of the alloy

Displacement is known as the net movement of an object with respect to its original position. One may travel out of his city and return. Despite having covered many miles, he will have have a displacement of 0.

This is true for all paths that have zero displacement, that they all return to their original position.

Joule is the correct answer.