If a car engine burns an equivalent of 20,000 joules of energy and attains a kinetic energy of 5,000 j, how much energy is dissipated in the form of heat?

What is the internal energy of 4.00 mol of diatomic nitrogen gas n2 at 455k

An object weighs 40n in air, weighs 20n when submerged in water and 30n when submerged in a liquid of unknown density. what is the density of the liquid?

The charge on an electron is 1.60218 × 10−19 c and its mass is 9.10939 × 10−31 kg. how strong a magnetic field must be experienced by the electron if its path is a circle of radius 5.5 cm? answer in units of t.