Question

Vivian is vacuuming her apartment. When she is finished, Vivian has expended 863 J of Work, and she has transferred 7,354 J of heat energy to her apartment through her very vigorous vacuuming. Vivian worked up a pretty good sweat while vacuuming (vigorously!), though her internal body temperature remains at 98.6o F.

A. Which of the following is true for Vivian when comparing her thermal energy, just before and just after the vigorous vacuuming?
Vivian's thermal energy increased decreased did not change?

B. By how much did Vivian's total energy change due to the vigorous vacuuming experience? Please enter your answer as a positive value, even if Vivian's energy decreased. Note that this is the total energy put into the vacuuming experience.

C. Which of the following best represents Vivian's efficiency in the vacuuming process?
(energy from heat transfer)/(Work + energy from heat transfer)
Work/(energy from heat transfer)
(energy from heat transfer)/Work
Work/(Work + energy from heat transfer)

D. What is Vivian's vacuuming efficiency? Please enter your answer as a percentage.

Answer 1