a.the gravitational force between 2 electrons 1.00m apart is 5.42x10^-71 N. Find the mass of an electron.

b.2 spherical balls are placed so their centres are 2.6m apart. The force between the balls is 2.75x10^-12N. What is the mass of each ball if one ball is twice the mass of the other ball?

1. 👍 0
2. 👎 1
3. 👁 1,584
1. (a) Solve F = 5.42x10^-71 N = G*m^2/(1)^2
m is the electron mass and g is the universal cnstant of gravity.
That equatiuon can be solved for m.

(b) Let the ball masses be M and 2M
F = 2.75x10^-12N = G*(2M^2)/(2.6)^2
Solve for M

1. 👍 2
2. 👎 2
2. 234 N

1. 👍 0
2. 👎 3

## Similar Questions

1. ### Physics

An astronaut of mass m in a spacecraft experiences a gravitational force F=mg when stationary on the launchpad. What is the gravitational force on the astronaut when the spacecraft is launched vertically upwards with an

2. ### Physics !!Check Answers!!

1. What happens to the gravitational force between two objects if the distance between them triples? A. The force increases by a factor of 3 B. The force decreases by a factor of 9 C. The force increases by a factor of 9 D. The

3. ### Physics

A small sphere X of mass M is placed a distance d from a point mass. The gravitational force on the sphere X is 90 N. Sphere X is removed and a second sphere Y of mass 4M is placed a distance 3d from the same point mass. What is

4. ### Physics

1.Two balls, each with a mass of 0.871 kg, exert a gravitational force of 8.23 × 10−11 N on each other. How far apart are the balls? The value of the universal gravitational constant is 6.673 × 10−11 Nm2/kg2. Answer in units

1. ### Physics

An interacting system of two objects has no external force acting on the system. The first has a mass of 2.00kg and is moving with a velocity (2.00m/s)i + (1.00m/s)j at time t=0s. The second object has a mass of 3.00kg and is

2. ### Physics

The mass of an electron is 9.109×10−31 kg, and the magnitude of the charge of an electron is 1.602×10−19 C. What is the ratio of the gravitational force to the electrostatic force between two electrons? 3.093×10^22

3. ### Physics

Two charges q1 and q2 exert a 90 N electrostatic force onto each other when they are 1 m apart. They are moved further away to a distance of 3 m. What will the new electrostatic force be? 30 N 810 N 10 N 270 N* What is the

4. ### Calc

Newton's Law of Gravitation says that the magnitude F of the force exerted by a body of mass m on a body of mass M is the following. F=(GmM)/r^2 Here G is the gravitational constant and r is the distance between the bodies. (a)

1. ### Physics Homework Check !!PLSS!!

1. Which list presents the four fundamental forces in order of relative strength from weakest to strongest? A. electromagnetism, weak nuclear, gravitational, strong nuclear B. gravitational, weak nuclear, electromagnetism, strong

2. ### physics

Two pellets, each with a charge of 1.0 microcoulomb (1.0×10−6 ), are located 4.0 (4.0×10−2 ) apart.A)find the electric force between them B)What would be the mass of an object that would experience this same force in Earth's

3. ### Physics

Select as many of the following statements that are TRUE when comparing Coulomb's Law to Newton's Universal Law of Gravitation. * Both Laws are about the relationship between two masses. Both Laws are "inverse square"

4. ### Physics Help

A dumbbell has a mass m on either end of a rod of length 2a. The center of the dumbbell is a distance r from the center of the Earth, and the dumbbell is aligned radially. If r≫a, the difference in the gravitational force