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Get Full Access to Physics With Masteringphysics - 4 Edition - Chapter 2 - Problem 124pp
Get Full Access to Physics With Masteringphysics - 4 Edition - Chapter 2 - Problem 124pp

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# Solved: Bam!—Apollo 15 Lands on the MoonThe first word

ISBN: 9780321541635 54

## Solution for problem 124PP Chapter 2

Physics with MasteringPhysics | 4th Edition

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Problem 124PP

Problem 124PP

Bam!—Apollo 15 Lands on the Moon

The first word spoken on the surface of the Moon after Apollo 15 landed on July 30,1971, was “Bam!” This was James Irwin’s involuntary reaction to their rather bone-jarring touchdown. “We did hit harder than any of the other flights!” says Irwin. “And I was startled, obviously, when I said, “Bam!’˝

The reason for the “firm touchdown” of Apollo 15, as pilot David Scott later characterized it, was that the rocket engine was shut off a bit earlier than planned, when the lander was still 4.30 ft above the lunar surface and moving downward with a speed of 0.500 ft/s. From that point on the lander descended in lunar free fall, with an acceleration of 1.62 m/s2. As a result, the landing speed of Apollo 15 was by far the largest of any of the Apollo missions. In comparison, Neil Armstrong’s landing speed on Apollo 11 was the lowest at 1.7 ft/s—he didn’t shut off the engine until the footpads were actually on the surface. Apollos 12, 14, and 17 all landed with speeds between 3.0 and 3.5 ft/s.

To better understand the descent of Apollo 15, we show its trajectory during the final stages of landing in Figure 2-37 (a). In Figure 2-37 (b) we show a variety of speed-versus-time plots.

FIGURE 2-37

Which of the speed-versus-time plots in Figure 2-37 (b) correctly represents the speed of the Apollo 15 lander?

A B C D

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##### ISBN: 9780321541635

This textbook survival guide was created for the textbook: Physics with MasteringPhysics, edition: 4. This full solution covers the following key subjects: Apollo, speed, figure, landing, surface. This expansive textbook survival guide covers 32 chapters, and 3833 solutions. Physics with MasteringPhysics was written by and is associated to the ISBN: 9780321541635. The full step-by-step solution to problem: 124PP from chapter: 2 was answered by , our top Physics solution expert on 07/27/17, 10:59AM. Since the solution to 124PP from 2 chapter was answered, more than 410 students have viewed the full step-by-step answer. The answer to “Bam!—Apollo 15 Lands on the MoonThe first word spoken on the surface of the Moon after Apollo 15 landed on July 30,1971, was “Bam!” This was James Irwin’s involuntary reaction to their rather bone-jarring touchdown. “We did hit harder than any of the other flights!” says Irwin. “And I was startled, obviously, when I said, “Bam!’?The reason for the “firm touchdown” of Apollo 15, as pilot David Scott later characterized it, was that the rocket engine was shut off a bit earlier than planned, when the lander was still 4.30 ft above the lunar surface and moving downward with a speed of 0.500 ft/s. From that point on the lander descended in lunar free fall, with an acceleration of 1.62 m/s2. As a result, the landing speed of Apollo 15 was by far the largest of any of the Apollo missions. In comparison, Neil Armstrong’s landing speed on Apollo 11 was the lowest at 1.7 ft/s—he didn’t shut off the engine until the footpads were actually on the surface. Apollos 12, 14, and 17 all landed with speeds between 3.0 and 3.5 ft/s.To better understand the descent of Apollo 15, we show its trajectory during the final stages of landing in Figure 2-37 (a). In Figure 2-37 (b) we show a variety of speed-versus-time plots.FIGURE 2-37 Which of the speed-versus-time plots in Figure 2-37 (b) correctly represents the speed of the Apollo 15 lander?A B C D” is broken down into a number of easy to follow steps, and 237 words.

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