a tennis ball machine fire a ball vertically upward at time t=0 at 19.6 m/s assume that air resistance is negligible and take g=9.8m/s ? calculate the displisment and velocity of t=1.0,2.0,3.0,4.0

Aneutron and a proton combine to form a nucleus. why does the mass of the nucleus differ from the sum of the masses of the individual nucleons?

Which statement best describes who the period and frequency of electromagnetic was change between gamma rays and microwaves? a) the period and frequency stay the same. b) the period increases and the frequency decreases. c) the period decreases and the frequency increases. d) the period increases and the frequency increases.

Curious carl calculated the density of a cube to be 4.50 g/cm3. what is the density of the cube in g/l?