The speed of a sound wave traveling through air is 342 m/s. Using that information and rearranging the equation above, what temperature is the air? ( I'm in 7th and I literally have so many problems with these questions )

1. a net force of 100 newton’s is applied to a wagon for 5 seconds. this causes the wagon to undergo a change in momentum of

Asher cycles 12 miles in 16 hours. what is his speed?

Africtionless piston-cylinder contains 50 l of saturated liquid r-134a. the piston has a mass and an area resulting in an applied pressure of 500 kpa on the refrigerant. the refrigerant is now heated until its temperature rises to 70∘c. calculate the work (in kj) done during this process.