Author Question: A 6.0-mF capacitor is attached to a 20-V power supply. How much energy is stored in the capacitor? ... (Read 396 times)

Mr.Thesaxman · **on:** Jul 28, 2018

A 6.0-mF capacitor is attached to a 20-V power supply. How much energy is stored in the capacitor?
a. 2.0 10-3 J
c. 2.0 10-4 J
b. 5.2 10-4 J
d. 1.2 10-3 J

Question 2

A 4.0-kg mass is placed at (3.0, 4.0) m, and a 7.0 kg-mass is placed at (3.0, -4.0) m. What is the moment of inertia of this system of masses about the z axis?
a. 275 kgm2
c. 250 kgm2
b. 90 kgm2
d. 180 kgm2