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Chapter 10: Q. 65 (page 259)
Write a realistic problem for which the energy bar chart shown inFIGURE P10.65 correctly shows the energy at the beginning and end of the problem.
Given in the explanation.
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A process occurs in which a system鈥檚 potential energy increases while the environment does work on the system. Does the system鈥檚 kinetic energy increase, decrease, or stay the same? Or is there not enough information to tell? Explain.
a. What is the kinetic energy of a car traveling at a speed of ?
b. From what height would the car have to be dropped to have this same amount of kinetic energy just before impact?
A cable with of tension pulls straight up on a block that is initially at rest. What is the block鈥檚 speed after being lifted ? Solve this problem using work and energy.
An object moving in the xy-plane is subjected to the force , where x and y are in m.
a. The particle moves from the origin to the point with coordinates by moving first along the x-axis to , then parallel to the y-axis. How much work does the force do?
b. The particle moves from the origin to the point with coordinates by moving first along the y-axis to , then parallel to thex-axis. How much work does the force do?
c. Is this a conservative force?
Can kinetic energy ever be negative? Can gravitational potential energy ever be negative? For each, give a plausible reason for your answer without making use of any equations.
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