8. A spring (k = 40 N/m) is mounted to a table. The unelongated length of the spring is 40 cm. A 0.026 kg block is gently placed on top of the spring. After some time passes, the block will be at a certain minimum distance above the table. Determine the compression of the spring at that time. A. 0.026 m B. 0.013 m C. 0.006 m. D. 0.003 m

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### Problem Description

A spring with a spring constant \( k = 40 \, \text{N/m} \) is mounted on a table. The unelongated length of the spring is 40 cm. A block weighing 0.026 kg is gently placed on top of the spring. After some time, the block will stabilize at a certain minimum distance above the table. Determine the compression of the spring at that time.

### Possible Answers

A. \( 0.026 \, \text{m} \)

B. \( 0.013 \, \text{m} \)

C. \( 0.006 \, \text{m} \)

D. \( 0.003 \, \text{m} \)

### Explanation

To solve this problem, apply Hooke's Law and balance the forces acting on the block. The gravitational force on the block equals the spring force at equilibrium.

1. **Gravitational Force**: \( F_g = m \cdot g \)

   Where:
   - \( m = 0.026 \, \text{kg} \)
   - \( g = 9.8 \, \text{m/s}^2 \)

2. **Spring Force**: \( F_s = k \cdot x \)

   Where:
   - \( k = 40 \, \text{N/m} \)
   - \( x \) is the compression of the spring.

Set \( F_g = F_s \) and solve for \( x \).

\[ 
m \cdot g = k \cdot x \\
0.026 \cdot 9.8 = 40 \cdot x \\
x = \frac{0.26}{40} \\
x = 0.0065 \, \text{m}
\]

Thus, the correct answer is close to option C, \( 0.006 \, \text{m} \).
Transcribed Image Text:### Problem Description A spring with a spring constant \( k = 40 \, \text{N/m} \) is mounted on a table. The unelongated length of the spring is 40 cm. A block weighing 0.026 kg is gently placed on top of the spring. After some time, the block will stabilize at a certain minimum distance above the table. Determine the compression of the spring at that time. ### Possible Answers A. \( 0.026 \, \text{m} \) B. \( 0.013 \, \text{m} \) C. \( 0.006 \, \text{m} \) D. \( 0.003 \, \text{m} \) ### Explanation To solve this problem, apply Hooke's Law and balance the forces acting on the block. The gravitational force on the block equals the spring force at equilibrium. 1. **Gravitational Force**: \( F_g = m \cdot g \) Where: - \( m = 0.026 \, \text{kg} \) - \( g = 9.8 \, \text{m/s}^2 \) 2. **Spring Force**: \( F_s = k \cdot x \) Where: - \( k = 40 \, \text{N/m} \) - \( x \) is the compression of the spring. Set \( F_g = F_s \) and solve for \( x \). \[ m \cdot g = k \cdot x \\ 0.026 \cdot 9.8 = 40 \cdot x \\ x = \frac{0.26}{40} \\ x = 0.0065 \, \text{m} \] Thus, the correct answer is close to option C, \( 0.006 \, \text{m} \).
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