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andre [41]
3 years ago
12

A copper sphere was moving at 25 m/s when it hit another object. This caused all of the KE to be converted into thermal energy f

or the copper sphere. If the specific heat capacity of copper is 387 J/(kg ⋅ C°), what was the increase in temperature?
0.23 C°
0.81 C°
1.3 C°
2.1 C°
Physics
1 answer:
JulsSmile [24]3 years ago
7 0
Increased temperature is 0.81 c
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A thin rod of length 0.64 m and mass 120 g is suspended freely from one end. It is pulled to one side and then allowed to swing
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Answer:

1. Kinetic Energy = 0.0161 Joules

2. Height = 0.0137m

Explanation:

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Angular speed, w = 1.40 rad/s

a.

Calculating the Rod's kinetic energy

This is calculated by

Kinetic Energy = ½Iw²

Where I = rotational inertia of the rod about an axis.

This is calculated as follows;

I = Icm + mh²

I = ImL² + m(L/2)²

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I = 0.016384 kgm²

By substituton

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KE = 0.01605632J

KE = 0.0161 Joules

2. Using the total conservation of momentum;

K + U = Kf + V

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U = Initial gravitational potential energy of the rod at lowest point

Kf = Final Kinetic Energy of the rod at maximum height = 0 J

V = Final gravitational potential energy of the rod at maximum height

So, K + U = Kf + V become

K + U = 0 + V

K + U = V

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0.01605632J = mgh

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h = 0.0137m

4 0
3 years ago
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