Any change of the energy of a system occurs because of energy transfer across th
ID: 1607278 • Letter: A
Question
Any change of the energy of a system occurs because of energy transfer across the boundaries of the system. combustion of fuels within the system. radioactive decay of elements within the system. all of the above. Only (b) and (c) above. A ball is connected to a light spring suspended vertically as shown in the figure. When pulled downward from its equilibrium position and released, the ball oscillates up and down, in the system of the ball and the spring what forms of energy are there during the motion? elastic potential energy, kinetic energy and gravitational energy, kinetic energy, elastic potential energy, and gravitational potential energy, kinetic energy, None of the above. As a result of friction between internal parts of an isolated system a. the total mechanical energy of the system increases. b. the total mechanical energy of the system decreases. c. the total mechanical energy of the system remains the same. d. the potential energy of the system increases but the kinetic energy remains the same. e. the kinetic energy of the system increases but the potential energy of the system remains the same. A champion athlete can produce one horsepower (746 w) for a short period of time, if a 70-kg athlete were to bicycle to the summit of a 500-m high mountain while expending power at this rate, she would reach the summit in _____ seconds. a. 1 b. 460 c. 500 d. 1000 e. 35000 When two bodies of different masses collide, the impulses they exert on each other are a) equal for all collisions. b) equal but opposite for all collisions. c) equal but opposite only for elastic collisions. d) equal but opposite only for inelastic collisions. e) equal but opposite only when the bodies have equal but opposite accelerations.Explanation / Answer
5) choice A is coorect one.
The energy change of a system occurs because of external actions.
6) CHOICE C IS CORRECT.
With just the ball and spring you have energy being exchanged between elastic potential in the spring and kinetic in the moving ball. The energy sloshes back and forth between these two forms as the spring compresses/relaxes and the ball moves slower/faster.So it have elastic potential.In addition, the ball is moving up and down in a gravity field which, of course, changes it's gravitational potential energy.
CHOICE C is correct one.
This system exhibits changes in kinetic energy as well as in both types of potential energy.
7)CHOICE b IS CORRECT ONE.
Total mechanical energy of the system is decreases.
8) P=E/t
t=E/P
t=mgh/P
t=70*9.8*500/746=460 seconds
choice b is correct
9)CHOICE B IS CORRECT
Equal but opposite for all collisions
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