Classes are canceled due to snow, so you take advantage of the extra time to conduct some physics experiments. You fasten a large toy rocket to the back of a sled and take the modified sled to a large, flat, snowy field. You ignite the rocket and observe that the sled accelerates from rest in the forward direction at a rate of 12.5 m/s2 for a time period of 3.50 s. After this time period, the rocket engine abruptly shuts off, and the sled subsequently undergoes a constant backward acceleration due to friction of 5.65 m/s2

Classes are canceled due to snow, so you take advantage of the extra time to conduct some physics experiments. You fasten a large toy rocket to the back of a sled and take the modified sled to a large, flat, snowy field. You ignite the rocket and observe that the sled accelerates from rest in the forward direction at a rate of 12.5 m/s2 for a time period of 3.50 s. After this time period, the rocket engine abruptly shuts off, and the sled subsequently undergoes a constant backward acceleration due to friction of 5.65 m/s2

Physics for Scientists and Engineers: Foundations and Connections

1st Edition

ISBN:9781133939146

Author:Katz, Debora M.

Publisher:Katz, Debora M.

Chapter2: One Dimensional Motion

Section: Chapter Questions

Problem 76PQ: Two carts are set in motion at t = 0 on a frictionless track in a physics laboratory. The first cart...

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Question

Classes are canceled due to snow, so you take advantage of the extra time to conduct some physics experiments. You fasten a large toy rocket to the back of a sled and take the modified sled to a large, flat, snowy field. You ignite the rocket and observe that the sled accelerates from rest in the forward direction at a rate of 12.5 m/s² for a time period of 3.50 s. After this time period, the rocket engine abruptly shuts off, and the sled subsequently undergoes a constant backward acceleration due to friction of 5.65 m/s².

After the rocket turns off, how much time does it take for the sled to come to a stop?

time:

By the time the sled finally comes to a rest, how far has it traveled from its starting point?

distance traveled:

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Classes are canceled due to snow, so you take advantage of the extra time to conduct some physics experiments. You fasten a large toy rocket to the back of a sled and take the modified sled to a large, flat, snowy field. You ignite the rocket and observe that the sled accelerates from rest in the forward direction at a rate of 13.5 m/s2 for a time period of 3.30 s. After this time period, the rocket engine abruptly shuts off, and the sled subsequently undergoes a constant backward acceleration due to friction of 6.15 m/s2. After the rocket turns off, how much time does it take for the sled to come to a stop? time: ? By the time the sled finally comes to a rest, how far has it traveled from its starting point? distance traveled: ?
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During the late 1940’s, Colonel John Paul Stapp was a pioneer in studying the effects of acceleration and deceleration on the human body. He made multiple runs strapped to a rocket sled that quickly accelerated him to high speeds along a straight track (see figure). His research led to improvements in restraining harnesses and seatbelts for pilots and automobile occupants. During his final run, he reached a maximum speed of 632 mph. When the sled’s braking system brought it to rest, Colonel Stapp experienced a deceleration of magnitude 46.2g, or 46.2 times the acceleration of gravity at the Earth’s surface. Although he survived, he did sustain injuries, such as a fractured wrist, broken ribs, and bleeding in his eyes. Calculate how long it took to bring the rocket sled to rest. Assume the deceleration was constant during the braking period
During the late 1940's, Colonel John Paul Stapp was a pioneer in studying the effects of acceleration and deceleration on the human body. He made multiple runs strapped to a rocket sled that quickly accelerated him to high speeds along a straight track (see figure). His research led to improvements in restraining harnesses and seatbelts for pilots and automobile occupants. During his final run, he reached a maximum speed of 632 mph. When the sled's braking system brought it to rest, Colonel Stapp experienced a deceleration of magnitude 46.2g, or 46.2 times the acceleration of gravity at the Earth's surface. Although he survived, he did sustain injuries, such as a fractured wrist, broken ribs, and bleeding in his eyes. Calculate how long it took to bring the rocket sled to rest. Assume the deceleration was constant during the braking period. Number i Units John Paul Stapp, Image taken from https:// commons.wikimedia. org/wiki/File:Stapp_ hits_the_brakes,_hard.gif Keystone/Stringer/…