An object slides along a curved track of negligible friction, as shown in the figure. The potential energy U of the object as a function of the position x is shown in the graph. The object starts at rest at x=0. Which of the following is a correct claim about the motion of the object?
(Would prefer an explanation, but it's not necessary)
A) The kinetic energy of the object is approximately the same at x=2m and x=5m.
B) At x=2m, the object has more potential energy than kinetic energy.
C) The object comes to rest when x=5.5m.
D) The rate of change of the potential energy is a minimum at x=0m.
E) The object achieves its maximum speed at approximately x=3m.
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Ответ:
E) The object achieves its maximum speed at approximately x=3m.
Explanation:
Since the object is moving in gravitational field
potential energy + kinetic energy = constant = 14 J
At x = 3 m , potential energy is minimum that is zero
kinetic energy will be maximum .
Kinetic energy = 14 - 0 = 14 J
Hence option ( E ) is the answer.
Ответ:
A & C.
Explanation:
cannot be an element, element = C (carbon), not graphite.
cannot be a mixture: graphite is only made out of carbon atoms.
It is a pure substance and a compound.