A cell phone charger uses 4.83J (work input) when plugged into an outlet, but only 1.31 J (work output) actually goes into the cell phone battery. The remaining joules are lost as heat. That is why the battery feels warm after charging for a while. How efficient is the charger?

How many miles of calcium oxide will be produced when 1.6 miles of iron (iii) oxide react with calcium phosphate

Imagine that a new planet is discovered with two moons of equal mass: moon a and moon b. the mass of the new planet is greater than the combined mass of its moons. moon a is farther away from the new planet than moon b. what is the planet's gravitational pull on moon a compared to the planet's gravitational pull on moon b? the planet's gravity repels moon a with a greater force than it repels moon b, which is why moon a is farther away. the gravitational pull on moon b is greater than on moon a because moon b is closer to the new planet than moon a. the gravitational pull on moon b is greater than on moon a because moon b is farther away from the new planet than moon a. the gravitational pull on moon a is the same as the gravitational pull on moon b because distance does not affect the planet's gravity.

Who determined the nature of chemical bonds?