1. A 5 x 105-kg subway train is brought to a stop from a speed of 0.5 m/s in 0.3 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? (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? k= N/m
1. A 5 x 105-kg subway train is brought to a stop from a speed of 0.5 m/s in 0.3 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? (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? k= N/m
Physics for Scientists and Engineers, Technology Update (No access codes included)
9th Edition
ISBN:9781305116399
Author:Raymond A. Serway, John W. Jewett
Publisher:Raymond A. Serway, John W. Jewett
Chapter8: Conservation Of Energy
Section: Chapter Questions
Problem 8.21P: A toy cannon uses a spring to project a 5.30-g soft rubber ball. The spring is originally compressed...
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