Author Question: Four point charges are on the rim of a circle. The charges are (in mC) +0.50, +3.0, -1.0, -0.50 . If ... (Read 12 times)

Redwolflake15 · **on:** Jul 28, 2018

Four point charges are on the rim of a circle. The charges are (in mC) +0.50, +3.0, -1.0, -0.50 . If the electrical potential at the circle's center due to the +0.5 charge alone is 4.5 104 V, what is the total potential at the center due to the four charges combined?
a. 18 104 V
c. zero
b. 4.5 104 V
d. -4.5 104 V

Question 2

A helicopter stays aloft by pushing large quantities of air downward every second. What mass of air must be pushed downward at 30.0 m/s every second to keep a 1000 kg helicopter aloft?
a. 120 kg
c. 327 kg
b. 245 kg
d. 490 kg