Answer:
Number of electrons, n = 12 electron
Explanation:
Given that,
The distance between charged spheres, 
The object experiences an electrostatic force that has a magnitude of, 
The electric force between spheres is given by :
Let there are n number of electrons. Using quantization of electric charge we get :
n = 11.93 electrons
or
n = 12 electrons
Hence, 12 electrons produce the charge on one of the objects.
Answer: 21 kg x m/s
Momentum can be found using the equation p = mv, or momentum = mass times velocity.
Therefore, to find the momentum of the bowling bowl, you can plug the mass and velocity values into the equation to get p = (7kg)(3m/s)
Solve the equation to get a momentum of 21kg x m/s
I hope I could help :)
I will assume that big Joe is big Jim. The equation for the momentum is p=m*v, where m is the mass of the body and v is the velocity. Big Joe has a mass m=105 kg and speed v=5.2 m/s. When we input the numbers:
p=105*5.2=546 kg*(m/s).
So big Joe's momentum before the collision is p=546 kg*(m/s).
