Modern Physics
3rd Edition
ISBN: 9781111794378
Author: Raymond A. Serway, Clement J. Moses, Curt A. Moyer
Publisher: Cengage Learning
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Textbook Question
Chapter 1, Problem 1Q
What two measurements will two observers in relative motion always agree on?
Expert Solution & Answer
To determine
The two measurement will two observers in relative motion always agree on.
Answer to Problem 1Q
The two measurements will two observers in the relative motion always agree on the speed of light and the relative speed between them.
Explanation of Solution
The speed of light in the universe is independent of the velocity of the observer, no matter how the observer moves relative to the light source. It is a universal constant. No information can travel faster than the speed of light. Thus, the speed of light measured by both the observers who are in relative motion is same.
The relative speed between the two observers will be same. Therefore, they agree about their own relative speed.
Conclusion:
Therefore, the two measurements will two observers in the relative motion always agree on the speed of light and the relative speed between them.
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Part C
Find the height yi
from which the rock was launched.
Express your answer in meters to three significant figures.
Learning Goal:
To practice Problem-Solving Strategy 4.1 for projectile motion problems.
A rock thrown with speed 12.0 m/s and launch angle 30.0 ∘ (above the horizontal) travels a horizontal distance of d = 19.0 m before hitting the ground. From what height was the rock thrown? Use the value g = 9.800 m/s2 for the free-fall acceleration.
PROBLEM-SOLVING STRATEGY 4.1 Projectile motion problems
MODEL: Is it reasonable to ignore air resistance? If so, use the projectile motion model.
VISUALIZE: Establish a coordinate system with the x-axis horizontal and the y-axis vertical. Define symbols and identify what the problem is trying to find. For a launch at angle θ, the initial velocity components are vix=v0cosθ and viy=v0sinθ.
SOLVE: The acceleration is known: ax=0 and ay=−g. Thus, the problem becomes one of…
Phys 25
Chapter 1 Solutions
Modern Physics
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