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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![### Physics Problem: Projectile Motion
#### Problem Statement:
A football is kicked at ground level with a speed of 17.2 m/s at an angle of 30.2° to the horizontal.
**Question:** How much later does it hit the ground?
#### Diagram:
The diagram shows a right triangle that illustrates the components of the football's initial velocity (V).
- The hypotenuse represents the initial velocity (17.2 m/s).
- One side represents the horizontal velocity component (\(V_x\)).
- The other side represents the vertical velocity component (\(V_y\)).
- The angle between the hypotenuse and the horizontal side is 30.2°.
- There is a point labeled as the ground and the direction of the projectile motion.
The components can be calculated as follows:
- \(V_x = V \cdot \cos(\theta)\)
- \(V_y = V \cdot \sin(\theta)\)
where \(V = 17.2 \, \text{m/s}\) and \(\theta = 30.2^\circ\).
#### Equations and Calculation:
1. Calculate horizontal and vertical components of the velocity:
- \(V_x = 17.2 \, \text{m/s} \cdot \cos(30.2^\circ)\)
- \(V_y = 17.2 \, \text{m/s} \cdot \sin(30.2^\circ)\)
2. Using the vertical motion equations to find the time \(t\) it takes for the football to hit the ground:
Since \(\Delta y = 0\) (the football starts and ends at ground level):
\[ \Delta y = V_y \cdot t - \frac{1}{2} g t^2 \]
Given:
- \(g = 9.81 \, \text{m/s}^2\)
- \( \Delta y = 0 \)
\[ 0 = (17.2 \cdot \sin(30.2^\circ)) t - \frac{1}{2} \cdot 9.81 \cdot t^2 \]
This can be solved for \(t\):
\[ t = \frac{2 \cdot (17.2 \cdot \sin(30.2^\circ))}{9.81} \]
Solve this equation to find the time \(t](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fcfcc845b-36c3-4587-86f5-d581ad6d0ef3%2F897737e9-d559-4b02-8744-13baa908bba4%2Fg4eqmjv.jpeg&w=3840&q=75)
Transcribed Image Text:### Physics Problem: Projectile Motion
#### Problem Statement:
A football is kicked at ground level with a speed of 17.2 m/s at an angle of 30.2° to the horizontal.
**Question:** How much later does it hit the ground?
#### Diagram:
The diagram shows a right triangle that illustrates the components of the football's initial velocity (V).
- The hypotenuse represents the initial velocity (17.2 m/s).
- One side represents the horizontal velocity component (\(V_x\)).
- The other side represents the vertical velocity component (\(V_y\)).
- The angle between the hypotenuse and the horizontal side is 30.2°.
- There is a point labeled as the ground and the direction of the projectile motion.
The components can be calculated as follows:
- \(V_x = V \cdot \cos(\theta)\)
- \(V_y = V \cdot \sin(\theta)\)
where \(V = 17.2 \, \text{m/s}\) and \(\theta = 30.2^\circ\).
#### Equations and Calculation:
1. Calculate horizontal and vertical components of the velocity:
- \(V_x = 17.2 \, \text{m/s} \cdot \cos(30.2^\circ)\)
- \(V_y = 17.2 \, \text{m/s} \cdot \sin(30.2^\circ)\)
2. Using the vertical motion equations to find the time \(t\) it takes for the football to hit the ground:
Since \(\Delta y = 0\) (the football starts and ends at ground level):
\[ \Delta y = V_y \cdot t - \frac{1}{2} g t^2 \]
Given:
- \(g = 9.81 \, \text{m/s}^2\)
- \( \Delta y = 0 \)
\[ 0 = (17.2 \cdot \sin(30.2^\circ)) t - \frac{1}{2} \cdot 9.81 \cdot t^2 \]
This can be solved for \(t\):
\[ t = \frac{2 \cdot (17.2 \cdot \sin(30.2^\circ))}{9.81} \]
Solve this equation to find the time \(t
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