Light waves can travel in vacuum.
But sound waves can not travel in
vacuum. Why?

Objects a and b are visible in the night sky. six months later they are still visible, but object b shows less parallax than object a. which object is closer? a. a b. b c. you would need to wait another six months in order to figure this out. d. you would need to know the objects' angular diameters in order to figure this out.

Two cans on a sunny window one black and the other white construct and explanation of the effect of sun will have on both cans over a two hour period?

He acceleration due to gravity on the surface of mars is about one third the acceleration due to gravity on earth’s surface. the weight of a space probe on the surface of mars is about