Gan astronaut stands on the surface of the moon and drops a dictionary (with a mass of 8 kg ) and a cell phone (with a mass of 200 g ) at the same time from the same height. which will hit the ground first? ignore the effects of atmospheric friction. there is not enough information to say which will hit first. the dictionary will hit the ground first. the cell phone will hit the ground first. they will hit the ground at the same time.

Astudent is performing an experiment comparing sound and light waves. the student gathers the following data. what conclusion does the student most likely make based on this data? light waves always travel the same speed; however, the speed of sound is determined by the medium that it travels through. all sound waves always have the same energy, so the temperature of the medium does not affect wave speed. light needs to vibrate particles, so it travels fastest in tightly packed solids, while sound does not need a medium, so it travels fastest in a gas. tightly packed particles in solids slow down the light waves; however, sound waves make particles bounce into each other, so they travel faster in solids.

Determine the maximum r-value of the polar equation r =3+3 cos 0

Name two kinds of practical electric pumps.