Author Question: Very large capacitors have been considered as a means for storing electrical energy. If we ... (Read 93 times)

dejastew · **on:** Jul 28, 2018

Very large capacitors have been considered as a means for storing electrical energy. If we constructed a very large parallel-plate capacitor of plate area 10 m2 using paper (k = 3.7) of thickness 1.0 mm as a dielectric, how much electrical energy would it store at a plate voltage of 5000 V? (e0 = 8.85 10-12 C2/Nm2)
a. 4.1 J
c. 0.41 J
b. 8200 J
d. 82,000 J

Question 2

Starting from rest, a wheel undergoes constant angular acceleration for a period of time T. At what time after the start of rotation does the wheel reach an angular speed equal to its average angular speed for this interval?
a. 0.25T
c. 0.67T
b. 0.50T
d. 0.71T