two electrons are separated by a distance of about 9.5x10^-19 m. Find the magnitude of the electric force and the gravitational force that each particle exerts on the other.

Molten iron fills a mould, which has a volume of 200 cm cubed. calculate the volume when the iron cools and solidifies.

When you push downward on a book at rest on a table, you feel an upward force. does this force depend on friction? defend your answer.

When a bicycle coasts uphill, it moves slower and slower as it climbs. why? a. its kinetic energy is transforming into heat energy. b. its potential energy is transforming into kinetic energy. c. its kinetic energy is transforming into potential energy and heat energy. d. its potential energy is transforming into kinetic energy and heat energy.