You want to calculate how long it takes a ball to fall to the ground from a height of 20 m. Which equation can you use to calculate the time? (Assume
no air resistance.)

Distinguish between a transverse wave and a longitudinal wave.

The discovery that the universe appears to be expanding led to a widely accepted theory called a.) the big bang theory b.) the doppler effect c.) hubble’s law d.) solar nebular theory e.) the seyfert theory

Arod of some material 0.20 m long elongates 0.20 mm on heating from 21 to 120°c. determine the value of the linear coefficient of thermal expansion [in (degrees c)^-1] for this material.