Compare and contrast the kinetic energies and momenta of the following pairs of objects with given speeds. → An arrow travelling at 600 m/s and the same arrow travelling at 1200 m/s.

College Physics
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Chapter1: Units, Trigonometry. And Vectors
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**Topic: Comparing Kinetic Energies and Momenta**

**Objective:**
Compare and contrast the kinetic energies and momenta of the following pairs of objects with given speeds.

**Comparison Pair:**

- An arrow traveling at 600 m/s and the same arrow traveling at 1200 m/s.

**Discussion:**

*Kinetic Energy:*

Kinetic energy (\(KE\)) is given by the formula:
\[ KE = \frac{1}{2} m v^2 \]
where \(m\) is the mass of the object and \(v\) is the velocity.

- When the arrow travels at 600 m/s, the kinetic energy is proportional to \((600)^2\).
- When the speed is doubled to 1200 m/s, the kinetic energy increases proportionally to \((1200)^2\).

Since kinetic energy is proportional to the square of the velocity, doubling the velocity results in a fourfold increase in kinetic energy.

*Momentum:*

Momentum (\(p\)) is given by the formula:
\[ p = m v \]

- For an arrow traveling at 600 m/s, the momentum is proportional to \(600\).
- For the same arrow traveling at 1200 m/s, the momentum is proportional to \(1200\).

Momentum increases linearly with velocity. Therefore, doubling the velocity of the arrow doubles its momentum.

This exercise demonstrates the distinct mathematical relationship between velocity, kinetic energy, and momentum.
Transcribed Image Text:**Topic: Comparing Kinetic Energies and Momenta** **Objective:** Compare and contrast the kinetic energies and momenta of the following pairs of objects with given speeds. **Comparison Pair:** - An arrow traveling at 600 m/s and the same arrow traveling at 1200 m/s. **Discussion:** *Kinetic Energy:* Kinetic energy (\(KE\)) is given by the formula: \[ KE = \frac{1}{2} m v^2 \] where \(m\) is the mass of the object and \(v\) is the velocity. - When the arrow travels at 600 m/s, the kinetic energy is proportional to \((600)^2\). - When the speed is doubled to 1200 m/s, the kinetic energy increases proportionally to \((1200)^2\). Since kinetic energy is proportional to the square of the velocity, doubling the velocity results in a fourfold increase in kinetic energy. *Momentum:* Momentum (\(p\)) is given by the formula: \[ p = m v \] - For an arrow traveling at 600 m/s, the momentum is proportional to \(600\). - For the same arrow traveling at 1200 m/s, the momentum is proportional to \(1200\). Momentum increases linearly with velocity. Therefore, doubling the velocity of the arrow doubles its momentum. This exercise demonstrates the distinct mathematical relationship between velocity, kinetic energy, and momentum.
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