Is a measure of how many waves pass by in one second.
a. velocity
b. amplitude
c. frequency
d. wavelength

What is the stall speed at sea level of an airplane that weights 10000 lbs., has a wing area of 300ft^2, and a maximum lift coefficient of 1.4? what is the stall speed if flaps that double cl,max are applied?

What kind of simple machine is a catapult?

What is the kinetic energy of a baseball moving at a speed of 40 m/s if the baseball has mass of 0.15 kg?