More help with electricity...?

Question

I really still need help...please answer these questions and explain them.

1. In an electric field, 0.90 joule of work is required to brin 0.45 coulomb of charge from point A to point B. What is the electric potential difference between points A and B?

2. Two protons are located one meter apart. Compared to the gravitational forceof attraction between the two protons, the electrostatic force between the protons is
(1) stronger and repulsive
(2) weaker and repulsive
(3) stronger and attractive
(4) weaker and attractive

3. If 4.8x10^-17 joule of work is required to move an electron between two points in an electric field, what is the electric potential difference between these points?

4. A motor used 120 watts of power to raise a 15 newton object in 5.0 seconds. Through what vertical distance was the object raised?

thank you

Answer 1

1.V=W/Q=0.90 / .45= 2 V
2.(1) stronger and repulsive You can prove that by calculating gravitational force to electrical force.
3.Similar to 1. Q(electron)= 1.602 e-19 C
so V=W/Q=4.8 e-17/ 1.602 e-19=300 V
4.P=Fv
v=h/t then
P=Fh/t

So h= Pt/F = 120 5.0/15 = 40meters

I hope it was useful.