
College Physics
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ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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How can the total energy remain constant even when it changes forms and from system to system?
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- Assume that the energy content in food can be converted to mechanical energy with 100% efficiency. How many chocolate candy bars (each with 330 kcal) would it take to climb Mount Everest (8850 m)? Assume that the mass of the climber, including equipment, is 127 kg. Round up to the nearest whole number.arrow_forwardRank the following bodies in order of their kinetic energy, from least to greatest along with reasons. (i) a 4.0-kg body moving at 10.0 m/s; (ii) a 2.0-kg body that initially was at rest and then had 60 J of work done on it; (iii) a 2.0-kg body that initially was moving at 8.0 m/s and then had 40 J of work done on it; (iv) a 4.0-kg body that initially was moving at 10 m/s and then did 80 J of work on another body.arrow_forwardA 56-kg pole vaulter running at 10 m/s vaults over the bar. Her speed when she is above the bar is 1.3 m/s. Neglect air resistance, as well as any energy absorbed by the pole, and determine her altitude as she crosses the bar.arrow_forward
- Question 12 ( A bullet penetrates a wooden block and loses its velocity by a half. What is the relation between the initial kinetic energy of the bullet and kinetic energy when the bullet leaves the block? Ek₁ = 1/2 Ekf Eki 1/1 Ekf Eki Ekf = • Eki Ek || Eki OEM=1 - Ekf 27/173 - ✓ Saved 16 1arrow_forwardA bunjee jumper has an elastic cord attached to his feet. The cord whose unstretched length is 10 m behaves just like a sprint and is attached at the other and to a platform high above the ground. After the bunjee jumper jumps off the platform where is his speed the greatest? -ar the lower point where the gravitational potential energy is smallest -when the upward force from the cord balances the force of gravity -when the kinetic energy equals the elastic energy in the cord -10 m below the platform when the cord first begins to stretcharrow_forward
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