A box is raised at constant speed by a man pulling up on a rope, During the asce
ID: 1318768 • Letter: A
Question
A box is raised at constant speed by a man pulling up on a rope, During the ascent whch of the following are true (select more than one if applicable). Assume that air resistance on the box is negligible. on a rope. During the ascent, which of the following x is 0. The work performed by all conservative forces on the bo The work performed by all non-conservative forces on the box is 0. The net work performed on the box is 0. The work performed by all conservative forces on the box is positive. The work performed by all non-conservative forces on the box is positive. As a result of your answer to the previous question, use the work-energy theorem to determine which of the following is true. O The change in the total energy of the box is 0 O The change in the total energy of the box is positive. O The change in the total energy of the box is negativeExplanation / Answer
total energy = KE+PE
box is raised by constant speed means no acceleration is there
so work done will be postive and increase the Potential energy
the change in total energy is postive
when rope falls
potential enrgy will convert in kinectic enrgy
so net work done =0
and total energy is constant.
(please note in this question we considered mg not as external force actually the correct term is kinetic energy and work theorm and i question instead of total energy the term should be kinectic energy then the option will be in first case
work done =0 (as net force tension in rope and mg will cancel out)
ke =constant as velocity is constant)
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