Afire is burning in a fire place where is the convection
a. you touch the warm bricks next to the fireplace
b. the fire heats the bricks at the bottom of the fireplace
c. heat is rising up the chimney

An object resting on a table weighs 100 n. with what force is the object pushing on the table? with what force is the table pushing on the object? explain how you got your answer.

The frequency of the fundamental of the guitar string is 320 hz. at what speed v do waves move along that string?

In a classical model of the hydrogen atom, the electron moves around the proton in a circular orbit of radius 0.053 nm. what is the electron's orbital frequency? what is the effective current of the electron?