Physics
posted by Alex
Two iron spheres each have a volume of 10 cm^3 and a mass of 78g. How many electrons must be placed on each sphere so that the electrostatic force of repulsion between them just balances the force of gravitational attraction? Assume the distance between the spheres is more than 2 meters.
Respond to this Question
Similar Questions

Physics HELP!!
Two iron spheres each have a volume of 10 cm^3 and a mass of 78g. How many electrons must be placed on each sphere so that the electrostatic force of repulsion between them just balances the force of gravitational attraction? 
physics
how many excess electrons must be placed on each of two small metal spheres placed 3.00 cm apart in a vacuum if the force of repulsion betwen the spheres is to be 0.000000008 N? 
physics  science
 two identical lead spheres have a combined mass of 12kg. the density of lead is 11400 kg m3. find the radius of each sphere. calculate the gravitational force of attraction between the 2 spheres when they are touching. two masses, … 
physics
Two spheres are placed so that their centers are 2.6 meters apart. The force between the two spheres is 2.75x10^12N What is the mass of each sphere if one sphere is twice the mass of the other sphere? 
Physics
1. The electrostatic force of attraction between two small spheres that are 1.0 meter apart is F. If the distance between the spheres is decreased to 0.5 meter, the electrostatic force will be a) F/2 b) 2f c) F/4 d) 4F I know when … 
Physics
Two very small spheres are initially neutral and separated by a distance of 0.50 m. Suppose that 2.50 x 10^13 electrons are removed from one sphere and placed on the other. What is the magnitude of the electrostatic force that acts … 
physics
how many electrons must be removed from each of the two 5kg copper spheres to make the electric force of repulsion between them equal in magnitude to the gravitational attraction between them? 
Physics
Two insulated charged metallic spheres A & B have their centres separated by a distance of 50cm in air. Calculate the force of electrostatic repulsion between them. If the charge on each is +5.0*10^8c. The radii of A & B are negligible … 
Physics
Two small spheres spaced 20.0 centimeters apart have equal charge. How many excess electrons must be present on each sphere if the magnitude of the force of repulsion between them is 4.57×10 −21 newtons? 
physic
Two spheres of mass M1 = 810 kg and M2 = 390 kg are placed 4.80 m apart. A particle of mass m = 12.0 kg is now placed midway between the two spheres. (a) What is the net gravitational force on the particle due to the two spheres?