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# In Fig. 8-29, a single frictionless roller-coaster car of

## Problem 2 Chapter 8

Fundamentals of Physics | 10th Edition

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Problem 2

In Fig. 8-29, a single frictionless roller-coaster car of mass m ! 825 kg tops the first hill with speed v0 ! 17.0 m/s at height h ! 42.0 m. How much work does the gravitational force do on the car from that point to (a) point A, (b) point B, and (c) point C? If the gravitational potential energy of the carEarth system is taken to be zero at C, what is its value when the car is at (d) B and (e) A? (f) If mass m were doubled, would the change in the gravitational potential energy of the system between points A and B increase, decrease, or remain the same? First hill A B C h h h/2 v0 L r Ice flake Figure 8-32 5 and 11. Figure 8-29 2 and 9.

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BSCI 201: Anatomy & Physiology Chapter 9 (Muscles) Notes­Part 2 by Mehrnaz Ighani Whole muscle contraction: ­ Contraction produces muscle tension, the force exerted on load or object to be moved ­ Contract may or may not be shorten muscle: 1. Isometric: no shortening, muscle tension increases but doesn’t exceed load 2. Isotonic: muscle shortens b/c muscle...

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