a uniform metre has a mass of 90g and it's center of mass is the 50cm mark this ruler suspended by a thread at the 70cm mark, l balance by a mass of weight W hanging from the 80cm mark .. calculate the weight of the ruler

Aman throws a football straight into the air. as it rises, it slows down. which type of energy is the football gaining?

An electric power distributor charges residential customers $0.10 per kilowatt-hour (kwh). the company advertises that "green power" is available in 150 kwh blocks for an additional $4 per month. (green power is generated from solar, wind power, and methane sources.) if a certain customer uses an average of 391 kwh per month and commits to one monthly 150 kwh block of green power, what is her annual power bill

Two positive charges are equal. which has more electric potential energy?