College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300

Chapter
Section

College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300
Textbook Problem

Superman leaps in front of Lois lane to save her from a volley of bullets. In a 1-minute interval, an automatic weapon fires 150 bullets, each of mass 8.0 g. at 4.00 × 102 m/s. The bullets strike his mighty chest, which has an area of 0.75 m2. Find the average force exerted on Superman’s chest if the bullets bounce back alter an elastic, head-on collision.

To determine
The average force exerted by the bullet.

Explanation

Given Info: The time interval is 1 minute. Mass of bullet is 8.0 g. Speed of the bullet is 4.00Ã—102â€‰m/s . Area is 0.75â€‰m2 . Number of bullets fired is 150.

Formula to calculate the average force is,

F=150(m[vâˆ’v']t)

• m is the mass of the bullet
• t Â is the time interval
• v and v' are the velocities

Substitute 8.0 g for m, 1 min for t, 4.00Ã—102â€‰m/s for v and âˆ’4.00Ã—102â€‰m/s for v' in the above expression to get F.

F=150((8.0â€‰g)[(4

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