When dropped from the same height, a hammer and feather fall at the same rate of acceleration in the absence of air friction and reach the ground at the same time. Why?

What happens to light waves from a star as the star moves away from earth?

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

Astudent creates a model of a closed ecosystem by filling a glass tank half full with water, then adding 10 snails and two small aquatic plants. the next day, all the snails are dead. what is the most likely cause of their death?