answer quicly please and will rate highly! 39 1. A 5.00 × 105-kg subway train is brought to a stop from a speed of 0.400 m/s in 0.300 m by a largespring bumper at the end of its track. Neglect friction.Think & Prepare1. Make note of what's given and what's unknown. Relate known quantities to symbols.2. Draw a labeled sketch if possible.3. Identify the physics principle and approach. Write down relevant equations symbolically. Simplify ifpossible.4. Insert numerical quantities to solve for unknowns.5. Does the answer make sense?Physics Principles(a) What external forces act on the train? Are they conservative or non-conservative?Normal force:Spring force:Weight:(b) Is mechanical energy conserved during the stopping of the train? Think about reasons for youranswer.(c) What is the force constant k of the spring?Enter to 3 significant figuresk=✔ N/mTI

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Science

Physics

answer quicly please and will rate highly! 39

Physics for Scientists and Engineers: Foundations and Connections

1st Edition

ISBN:9781133939146

Author:Katz, Debora M.

Publisher:Katz, Debora M.

Chapter8: Conservation Of Energy

Section: Chapter Questions

Problem 45PQ

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Question

answer quicly please and will rate highly!

1. A 5.00 × 105-kg subway train is brought to a stop from a speed of 0.400 m/s in 0.300 m by a large
spring bumper at the end of its track. Neglect friction.
Think & Prepare
1. Make note of what's given and what's unknown. Relate known quantities to symbols.
2. Draw a labeled sketch if possible.
3. Identify the physics principle and approach. Write down relevant equations symbolically. Simplify if
possible.
4. Insert numerical quantities to solve for unknowns.
5. Does the answer make sense?
Physics Principles
(a) What external forces act on the train? Are they conservative or non-conservative?
Normal force:
Spring force:
Weight:
(b) Is mechanical energy conserved during the stopping of the train? Think about reasons for your
answer.
(c) What is the force constant k of the spring?
Enter to 3 significant figures
k=
✔ N/m
TI

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