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Questions and Answers
What is the kinetic energy of a non-rotating object of mass $m$ traveling at a speed $v$ in classical mechanics?
What is the kinetic energy of a non-rotating object of mass $m$ traveling at a speed $v$ in classical mechanics?
- $mv^2$
- $\frac{1}{2}m^2v$
- $2mv$
- $\frac{1}{2}mv^2$ (correct)
What is the work needed to accelerate an object of mass $m$ from rest to its stated velocity?
What is the work needed to accelerate an object of mass $m$ from rest to its stated velocity?
- $\frac{1}{2}mv^2$ (correct)
- $mv$
- $\frac{1}{2}m^2v$
- $2mv$
What is the standard unit of kinetic energy?
What is the standard unit of kinetic energy?
- Joule (correct)
- Newton
- Watt
- Coulomb
In relativistic mechanics, when is $\frac{1}{2}mv^2$ a good approximation of kinetic energy?
In relativistic mechanics, when is $\frac{1}{2}mv^2$ a good approximation of kinetic energy?
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What is the English unit of kinetic energy?
What is the English unit of kinetic energy?
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Study Notes
Kinetic Energy
- The kinetic energy of a non-rotating object of mass m traveling at a speed v in classical mechanics is equal to $\frac{1}{2}mv^2$.
- The work needed to accelerate an object of mass m from rest to its stated velocity is equal to the kinetic energy of the object.
Units of Kinetic Energy
- The standard unit of kinetic energy is the joule (J).
- The English unit of kinetic energy is the foot-pound (ft-lb).
Relativistic Mechanics
- In relativistic mechanics, $\frac{1}{2}mv^2$ is a good approximation of kinetic energy when the object's velocity is much less than the speed of light.
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