Chapter 29, Problem 48PE

### College Physics

1st Edition
Paul Peter Urone + 1 other
ISBN: 9781938168000

Chapter
Section

### College Physics

1st Edition
Paul Peter Urone + 1 other
ISBN: 9781938168000
Textbook Problem

# Unreasonable ResultsA car feels a small force due to the light it sends out from its headlights, equal to the momentum of the light divided by the time in which it is emitted. (a) Calculate the power of each headlight, if they exert a total force of 2.00 × 10 − 2 N backward on the car. (b) What is unreasonable about this result? (c) Which assumptions are unreasonable or inconsistent?

(a)

To determine

Explanation

Given:

Total force, F=2.00Ã—10âˆ’2â€‰N

Formula used:

The expression to calculate the power of headlights is given as,

â€ƒâ€ƒP=Fvâ€ƒâ€ƒâ€ƒ...... (1)

Calculation:

Substitute the values in equation (1) to calculate the power of two headlights.

â€ƒâ€ƒPtotal=(2.00Ã— 10 âˆ’2â€‰N)Ã—(3Ã— 108â€‰m/s

(b)

To determine

The unreasonable fact about the above result.

(c)

To determine

The unreasonable or inconsistent assumption in the given problem.

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