At time ti, the kinetic energy of a particle is 35.0 J and the potential energy
ID: 2034209 • Letter: A
Question
At time ti, the kinetic energy of a particle is 35.0 J and the potential energy of the system to which it belongs is 9.00 J. At some later time tf, the kinetic energy of the particle is 19.0 J. (a) If only conservative forces act on the particle, what are the potential energy and the total energy at time tf? potential energy total energy (b) If the potential energy of the system at time tris 21.0 J, are there any nonconservative forces acting on the particle? No. The loss in potential energy and the gain in kinetic energy of the system are equal Yes. The gain in potential energy and the loss in kinetic energy of the system are not equal. No. The gain in potential energy and the loss in kinetic energy of the system are equal. Yes. The loss in potential energy and the gain in kinetic energy of the system are not equal. O (c) Explain your answer to part (b).Explanation / Answer
when conservative forces only act on a system the total mechanical energy of the system remains constant.
a) PEf + KEf = PEi + KEi
PEf + 19 = 35 + 9
PEf = 35 + 9 - 19
= 25 J <<<<<------------Answer
TE = 35 + 9
= 44 J
b) Yes. The loss in potential energy and the gain in kinetic of the system are not equal.
c) Gain in kinetic energy = 19 - 9 = 10 J
loss of potential energy = 35 - 21 = 14 J
when conservative forces only act on a system the total mechanical energy is conserved.
But in this case mechaincal energy is not conserved. so, there some nonconservative forces acting on the system.
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.