Ch 32 Homework Problems

1. After some rather exhausting counting, a physics teacher determines that a very small sample of an object contains 8.257x10¹⁷protons and 5.26x10¹⁴electrons. What is the charge on this object?

2. The amount of charge carried by a lightning bolt is estimated at -10 Coulombs. What quantity of excess electrons is carried by the lightning bolt?

3.When an oil tanker car has arrived at its destination, it prepares to empty its fuel into a reservoir or tank. Part of the preparation involves connecting the body of the tanker car with a metal wire to the ground. Explain why this is done.

4.Determine the quantity of charge on a vinyl balloon which has been rubbed with animal fur and gained 1.7x1012electrons.

5.Determine the electrical force of attraction between two balloons that are charged with the opposite type of charge but the same quantity of charge. The charge on the balloons is 6.0 x 10⁷C and they are separated by a distance of 0.50 m.

6.Two ping pong balls have been painted with metallic paint and charged by contact with a Van de Graaff generator. The charge on the balls are -3.1x10-7 C and -3.7x10-7 C. Determine the force of electrical repulsion when held a distance of 42 cm apart.

7.Two vinyl balloons with an identical charge are given a separation distance of 52 cm. The balloons experience a repulsive force of 2.74x10-3 N. Determine the magnitude of charge on each one of the balloons.

8.What mass would a pair of electrons have in order for their gravitational force of attraction to be equal to the electrical force of repulsion? (Use G=6.67x10^-11Nm²/kg².)

9.How doesthe answer compare to the ACTUAL mass of an electron, 9.11x10^-31 kg?