Two parallel plates of area 7.34 x 10-4 m2 have 5.83 x 10-8 C of charge placed on
them. A 6.62 x 10-6 C charge q, is placed
between the plates. What is the magnitude of
the electric force on 91?
Hint: How is force related to the field?
(Unit = N)
Help please

What object a collides with object b and bounces back its final momentum is?

The average density of the planet uranus is 1.27 103 kg/m3. the ratio of the mass of neptune to that of uranus is 1.19. the ratio of the radius of neptune to that of uranus is 0.969. find the average density of neptune.

Consider the growth of a 20-nm-diameter silicon nanowire onto a silicon wafer. the temperature of the wafer surface is maintained at 2400 k. assume the thermal conductivity of the silicon nanowire is 20 wm-1k-1 and all its surfaces including the tip are subjected to convection heat transfer with the coefficient h = 1×105 wm-2k-1 and t∞ = 8000 k. when the nanowire grows to l = 300 nm, what is the temperature of the nanowire tip (t (x =