17. A skateboarder reached a speed 35.0 m/s on his skateboard. Suppose it took 21500 J of work for him to reach this speed from a speed of 25.0 m/s. Calculate the skateboarder's mass.
17. A skateboarder reached a speed 35.0 m/s on his skateboard. Suppose it took 21500 J of work for him to reach this speed from a speed of 25.0 m/s. Calculate the skateboarder's mass.
College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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What is the skateboarders mass?
![**Problem 17: Skateboarder’s Speed and Mass Calculation**
A skateboarder reached a speed of 35.0 m/s on his skateboard. Suppose it took 21,500 J of work for him to reach this speed from a speed of 25.0 m/s. Calculate the skateboarder’s mass.
**Solution Explanation:**
To calculate the skateboarder's mass, we use the work-energy principle. The work done on the skateboarder is equal to the change in kinetic energy:
\[ \text{Work} = \Delta KE = KE_{\text{final}} - KE_{\text{initial}} \]
Kinetic energy (\( KE \)) is given by the formula:
\[ KE = \frac{1}{2}mv^2 \]
**Given:**
- Initial speed (\( v_i \)) = 25.0 m/s
- Final speed (\( v_f \)) = 35.0 m/s
- Work done (\( W \)) = 21,500 J
**Steps:**
1. Calculate the initial kinetic energy (\( KE_{\text{initial}} \)):
\[ KE_{\text{initial}} = \frac{1}{2} m (v_i)^2 = \frac{1}{2} m (25.0)^2 \]
2. Calculate the final kinetic energy (\( KE_{\text{final}} \)):
\[ KE_{\text{final}} = \frac{1}{2} m (v_f)^2 = \frac{1}{2} m (35.0)^2 \]
3. Apply the work-energy principle:
\[ 21,500 = KE_{\text{final}} - KE_{\text{initial}} \]
4. Substitute the kinetic energy expressions and solve for \( m \):
\[ 21,500 = \frac{1}{2} m (35.0)^2 - \frac{1}{2} m (25.0)^2 \]
5. Simplify and solve for \( m \):
\[ 21,500 = \frac{1}{2} m (35.0^2 - 25.0^2) \]
\[ 21,500 = \frac{1}{2} m (1225 - 625) \]
\[ 21,500 = \frac{1}{2} m (600) \](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F51017fe1-0672-4cad-89e4-c6f0a0bf2651%2Fff213256-7d9c-4687-a60a-a699f38cfe17%2Fr6ewmsd_processed.jpeg&w=3840&q=75)
Transcribed Image Text:**Problem 17: Skateboarder’s Speed and Mass Calculation**
A skateboarder reached a speed of 35.0 m/s on his skateboard. Suppose it took 21,500 J of work for him to reach this speed from a speed of 25.0 m/s. Calculate the skateboarder’s mass.
**Solution Explanation:**
To calculate the skateboarder's mass, we use the work-energy principle. The work done on the skateboarder is equal to the change in kinetic energy:
\[ \text{Work} = \Delta KE = KE_{\text{final}} - KE_{\text{initial}} \]
Kinetic energy (\( KE \)) is given by the formula:
\[ KE = \frac{1}{2}mv^2 \]
**Given:**
- Initial speed (\( v_i \)) = 25.0 m/s
- Final speed (\( v_f \)) = 35.0 m/s
- Work done (\( W \)) = 21,500 J
**Steps:**
1. Calculate the initial kinetic energy (\( KE_{\text{initial}} \)):
\[ KE_{\text{initial}} = \frac{1}{2} m (v_i)^2 = \frac{1}{2} m (25.0)^2 \]
2. Calculate the final kinetic energy (\( KE_{\text{final}} \)):
\[ KE_{\text{final}} = \frac{1}{2} m (v_f)^2 = \frac{1}{2} m (35.0)^2 \]
3. Apply the work-energy principle:
\[ 21,500 = KE_{\text{final}} - KE_{\text{initial}} \]
4. Substitute the kinetic energy expressions and solve for \( m \):
\[ 21,500 = \frac{1}{2} m (35.0)^2 - \frac{1}{2} m (25.0)^2 \]
5. Simplify and solve for \( m \):
\[ 21,500 = \frac{1}{2} m (35.0^2 - 25.0^2) \]
\[ 21,500 = \frac{1}{2} m (1225 - 625) \]
\[ 21,500 = \frac{1}{2} m (600) \
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