A spring powered gun has Hooke's constant k. The spring is compressed by length 6 and shoots a pellet (mass = m) horizontally from height h above ground level. Calculate (A) the initial speed of the pellet. When the pellet hits the ground, what are (B) the speed and (C) the horizontal distance? [Data: k = 75 N/m; 8 = 3.4 cm; m = 15 grams; h = 1.22 m ]

College Physics
11th Edition
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Chapter1: Units, Trigonometry. And Vectors
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**Spring-Powered Gun Physics Problem**

A spring-powered gun has Hooke's constant \( k \). The spring is compressed by length \( \delta \) and shoots a pellet (mass = \( m \)) horizontally from height \( h \) above ground level. Calculate:
- **(A)** The initial speed of the pellet.
- When the pellet hits the ground, determine:
  - **(B)** The speed
  - **(C)** The horizontal distance

**Data:**
- \( k = 75 \, \text{N/m} \)
- \( \delta = 3.4 \, \text{cm} \)
- \( m = 15 \, \text{grams} \)
- \( h = 1.22 \, \text{m} \)

**Instructions:**
1. Convert all given units into standard units (e.g., convert cm to m and grams to kg).
2. Use energy conservation principles to find the initial speed. The potential energy in the spring is converted into kinetic energy.
3. Apply kinematics and energy principles to find the speed and horizontal distance when the pellet hits the ground. Consider both horizontal and vertical motion components.
Transcribed Image Text:**Spring-Powered Gun Physics Problem** A spring-powered gun has Hooke's constant \( k \). The spring is compressed by length \( \delta \) and shoots a pellet (mass = \( m \)) horizontally from height \( h \) above ground level. Calculate: - **(A)** The initial speed of the pellet. - When the pellet hits the ground, determine: - **(B)** The speed - **(C)** The horizontal distance **Data:** - \( k = 75 \, \text{N/m} \) - \( \delta = 3.4 \, \text{cm} \) - \( m = 15 \, \text{grams} \) - \( h = 1.22 \, \text{m} \) **Instructions:** 1. Convert all given units into standard units (e.g., convert cm to m and grams to kg). 2. Use energy conservation principles to find the initial speed. The potential energy in the spring is converted into kinetic energy. 3. Apply kinematics and energy principles to find the speed and horizontal distance when the pellet hits the ground. Consider both horizontal and vertical motion components.
Expert Solution
Step 1

Given data:

The spring constant (k) = 72 N/m

The mass, m= 15 grams = 15×103 kg

h = 1.3 m

The compression in spring δ=3.4 cm=3.4×10-2 m

The acceleration due to gravity = 9.81 m/s2

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