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Chapter 6: Problem 10

An automobile with a mass of \(1600 \mathrm{kg}\) has a speed of $30.0 \mathrm{m} / \mathrm{s} .$ What is its kinetic energy?

Short Answer

Expert verified
Answer: The kinetic energy of the automobile is 720,000 J.

Step by step solution

01

Identify the given values

Here, we are given the mass of the automobile, \(m = 1600 \mathrm{kg}\), and its speed, \(v = 30.0 \mathrm{m/s}\).
02

Write down the formula for kinetic energy

The formula for kinetic energy is given by: \(KE = \frac{1}{2}mv^2\).
03

Plug in the given values into the formula

Lets plug the given mass \(m\) and speed \(v\) into the formula of kinetic energy. Thereby, we can substitute \(m=1600\,\mathrm{kg}\) and \(v=30.0\,\mathrm{m/s}\): \(KE = \frac{1}{2} (1600\,\mathrm{kg}) (30.0\,\mathrm{m/s})^2\).
04

Perform the calculation

Now, let's calculate the kinetic energy: \(KE = \frac{1}{2} (1600\,\mathrm{kg}) (30.0\,\mathrm{m/s})^2 = 800\,\mathrm{kg}\cdot (900\,\mathrm{m^2/s^2}) = 720,\!000\,\mathrm{J}\).
05

State the final answer

The kinetic energy of the automobile is \(720,\!000\,\mathrm{J}\).

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Most popular questions from this chapter

A shooting star is a meteoroid that burns up when it reaches Earth's atmosphere. Many of these meteoroids are quite small. Calculate the kinetic energy of a meteoroid of mass \(5.0 \mathrm{g}\) moving at a speed of $48 \mathrm{km} / \mathrm{s}$ and compare it to the kinetic energy of a 1100 -kg car moving at \(29 \mathrm{m} / \mathrm{s}(65 \mathrm{mi} / \mathrm{h})\).
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