EBK PHYSICS FOR SCIENTISTS AND ENGINEER
EBK PHYSICS FOR SCIENTISTS AND ENGINEER
9th Edition
ISBN: 9780100460300
Author: SERWAY
Publisher: YUZU
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Chapter 39, Problem 39.1QQ

Which observer in Figure 38.1 sees the ball’s correct path? (a) the observer in the truck (b) the observer on the ground (c) both observers

Chapter 39, Problem 39.1QQ, Which observer in Figure 38.1 sees the balls correct path? (a) the observer in the truck (b) the

Figure 38.1 Two observers watch the path of a thrown ball and obtain different results.

Expert Solution & Answer
Check Mark
To determine
The observer who sees the correct path.

Answer to Problem 39.1QQ

Option(c) both observers.

Explanation of Solution

The laws of mechanics are same for all inertial frames. The inertial frame of the observer in truck has the inertial frame that is at moving at the velocity of the truck and the relative motion with the ball is zero so the observer in the truck sees the path of the ball move in a vertical path.

The inertial frame of the observer on the ground has the inertial frame that is at stationary and the relative motion with the ball is moving at the velocity of the truck so the observer on the ground sees the path of the ball move as a parabola.

Both the observer sees the correct path due to the validity if Newton’s laws of motion but the inertial frames are different so they see different paths of the ball.

Conclusion:

Since, both the observer sees the correct path but the inertial frames are different so they see different paths of the ball. Thus, option (c) is correct.

As the inertial frame of observer on the ground is stationary and the inertial frame of observer on the truck is moving. Thus, option (a) is incorrect.

As the inertial frames of both the observers are same due to which the path of the ball observed is different which contradicts the fact that the path seen by observer on the ground is only correct. Thus, option (b) is incorrect.

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Chapter 39 Solutions

EBK PHYSICS FOR SCIENTISTS AND ENGINEER

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