What is the kinetic energy of a 0.4 kg football being thrown at 35 m/s? 14 J
490 J
245 J
137.2 J

Acalorimeter uses the principle that thermal energy flows from hotter material to colder material until both reach the same

Awave with a frequency of 500 hz is traveling at a speed of 100 m/s.what is the wavelength?

Two masses are connected by a rope that hangs over a pulley as shown below. the pulley is a uniform cylinder of radius 푅=0.381meters and mass 푀=3.1푘푔. initially 푚"is on the ground and 푚#rests 2.5 meters above the ground. if the system is released, use conservation of energy to determine the speed of 푚#just before it strikes the ground. assume the pulley bearing is frictionless.