Author Question: The Department of Energy develops a new reversible engine which has a COP of 4 when operated as a ... (Read 33 times)

nenivikky · **on:** Jul 27, 2018

The Department of Energy develops a new reversible engine which has a COP of 4 when operated as a refrigerator and a COP of 5 when operated as a heat pump. What is its efficiency when operated as an engine doing work?

A) 10.
B) 20.
C) 25.
D) 45.
E) 80.

Question 2

Consider a uniform electric field of 50. N/C directed toward the East. If the voltage measured relative to ground at a given point in the field is 80. V, what is the voltage at a point 1.0 m directly East of the point?

A) 15. V
B) 30. V
C) 0.15 kV
D) 30. kV
E) impossible to calculate from the information given