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Ch.1 - Introduction: Matter, Energy, and Measurement
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All textbooksBrown 15th EditionCh.1 - Introduction: Matter, Energy, and MeasurementProblem 29a

Chapter 1, Problem 29a

(a) Calculate the kinetic energy (in joules) of a 1200-kg automobile moving at 18 m/s.

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Hi everyone today, we have a question telling us a 1500 kg car is moving at a speed of 115 m/s. And our question is what is its kinetic energy? So we're going to use the formula kinetic energy equals one half of our mass times our velocity squared. So now we're going to plug in our numbers. Our kinetic energy is going to equal half of 1500 kg Times 115 meters per second squared, And that equals nine 92 Times 10 to the 6th kilograms times meters squared times inverse seconds squared. And that is our final answer. Thank you for watching. Bye.
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a. removing the pulp from freshly squeezed orange juice,

b. separating a food dye into its individual components,

c. desalinating seawater?

Textbook Question

A silvery metal is put inside a beaker of water. Bubbles form on the surface of the metal and it dissolves gradually. (a) Is this an example of a chemical or a physical change?

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Textbook Question

A soccer ball is dropped out of a window on the second floor of a dormitory to the ground below. Which of the following statements is or are true?

i. The kinetic energy of the ball is greatest at the time it is dropped out the window.

ii. As the ball falls, potential energy is converted into kinetic energy.

iii. The potential energy of the ball is due to the force of gravity acting on it.

Open Question

The mass of a helium atom is roughly four times that of a hydrogen atom. The mass of an oxygen atom is roughly 16 times that of a hydrogen atom.

a. For each of the following pairs, choose the one that has the greater kinetic energy: (i) a H atom moving at 1000 m/s or a He atom moving at 400 m/s, (ii) a H atom moving at 1000 m/s or an O atom moving at 400 m/s, (iii) a He atom moving at 1000 m/s or an O atom moving at 400 m/s.

b. A He atom is moving at 800 m/s. What is the speed of an O atom that has the same kinetic energy as the He atom?

Textbook Question

Two positively charged particles are first brought close together and then released. Once released, the repulsion between particles causes them to move away from each other. a. This is an example of potential energy being converted into what form of energy?

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Textbook Question

Two positively charged particles are first brought close together and then released. Once released, the repulsion between particles causes them to move away from each other. b. Does the electrostatic potential energy of the two particles increase or decrease as the distance between them is increased?

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