Power: The phase angle of an ac circuit is 63°. What is the power factor?
A. 0.89
B. 0.55
C. 0.45
D. 0.11
Answer: C
You might also like to view...
In Young's two-slit experiment, the distance between the slits and the screen is 1.1 m and the distance between the slits is 0.040 mm
If the second order bright fringe is measured to be 4.2 cm from the centerline, what is the distance between the adjacent fringes? A) 6.3 cm B) 3.1 cm C) 1.3 cm D) 2.1 cm E) 4.2 cm
A reversible engine takes in 555. Joules per second and exhausts 482. watts
(a) How much power does it produce? (b) What is its efficiency? (c) If operated in reverse as a refrigerator, what would be its COP?
If the Earth's period of rotation were halved, but the period of revolution about the Sun stayed the same,
a. the night would be twice as long. b. the night would be half as long. c. the year would be half as long. d. the year would be half as long. e. the length of the day would be unchanged.
What practical value did astronomy offer to ancient civilizations?
A) It helped them keep track of time and seasons, and it was used by some cultures for navigation. B) It allowed them to predict eclipses with great accuracy. C) It helped them understand our cosmic origins. D) It helped them find uses for ancient structures like Stonehenge.