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Tomtit [17]
3 years ago
11

What is the total energy of a system with KE = 1368 J and a PE = 5782J? Express your answer in kJ.

Physics
1 answer:
mezya [45]3 years ago
6 0

Answer:

7.150 KJ

Explanation:

The total energy of a system is the sum of the potential and kinetic energy in the system. According to this question, the kinetic energy (KE) = 1368 J and a potential energy (PE) = 5782J.

Total energy of the system will be PE + KE as follows;

1368J + 5782J

= 7150J

However, the question demanded that the answer be in kJ (kilojoules), which is higher than the joules.

Since 1kJ = 1000J

7150J = 7150/1000

= 7.150kJ

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Answer:

Therefore, the revolutions that each tire makes is:

\Delta \theta=22\: rev

Explanation:

We can use the following equation:

\omega_{f}^{2}=\omega_{i}^{2}-2\alpha \Delta \theta (1)

The angular acceleration is:

a_{tan}=\alpha R

\alpha=\frac{1.9}{0.325}

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and the initial angular velocity is:

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Now, using equation (1) we can find the revolutions of the tire.

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I hope it helps you!

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3 years ago
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