
Determine the kinetic energy of (a) a 1.25-kg mass moving at 5.75 m/s, (b) a car weighing 3250 lb moving at 35 mph, (c) an electron moving at 475 m/s, (d) a helium atom moving at 725 m/s.
(a)

Interpretation:
Kinetic energy should be calculated in the given statement by using the equation of kinetic energy
Concept Introduction:
Energy is the capacity to do work or transfer heat where work is the movement of a body using some force. The SI unit of energy is joule (
Where,
Explanation of Solution
To find: Determine the kinetic energy of a
Kinetic energy (in joule) is calculated using the formula:
Where,
Therefore, the kinetic energy of a
(b)

Interpretation:
Kinetic energy should be calculated in the given statement by using the equation of kinetic energy
Concept Introduction:
Energy is the capacity to do work or transfer heat where work is the movement of a body using some force. The SI unit of energy is joule (
Where,
Explanation of Solution
To find: Determine the kinetic energy of a car weighing
Kinetic energy (in joule) is calculated using the formulae:
Where,
The mass of the car in kilograms is
The velocity of the car in meters per second is
Substitute the given values in the formula,
Therefore, the kinetic energy of a car weighing
(c)

Interpretation:
Kinetic energy should be calculated in the given statement by using the equation of kinetic energy
Concept Introduction:
Energy is the capacity to do work or transfer heat where work is the movement of a body using some force. The SI unit of energy is joule (
Where,
Explanation of Solution
To find: Determine the kinetic energy of an electron moving at
Kinetic energy (in joule) is calculated using the formulae:
Where,
The mass of an electron in kilograms is
Substitute the given values in the formula,
Therefore, the kinetic energy of an electron moving at
(d)

Interpretation:
Kinetic energy should be calculated in the given statement by using the equation of kinetic energy
Concept Introduction:
Energy is the capacity to do work or transfer heat where work is the movement of a body using some force. The SI unit of energy is joule (
Where,
Explanation of Solution
To find: Determine the kinetic energy of a helium atom moving at
Kinetic energy (in joule) is calculated using the formulae:
Where,
The mass of a helium atom in kilograms is
Substitute the given values in the formula,
Therefore, the kinetic energy of a helium atom moving at
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Chapter 3 Solutions
EBK CHEMISTRY: ATOMS FIRST
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