Ball 1, with a mass of 20kg, is moving to the right at 20m/s. At what velocity should Ball 2, with a mass of 40kg, move so that they both come to a stand still upon collision?

Two main pieces of evidence support the big bang theory and the idea that our universe is continually expanding: Doppler shift and cosmic background radiation. Explain how these phenomena provide evidence of the expansion of the universe.

How has the concept of a "planet" changed since the 16th century before the invention of the telescope? Do you think this shows scientific accuracy or disproves future facts, as one assumes that they will be discredited in time too?

In addition to an all-round white light, what light (s) must power-driven vessels less than 65.6 feet (20 meters) long exhibit when underway between sunset and sunrise?

How much force is needed to accelerate a 66kg skier at 2m/s. 2

Liquid droplets that fall from the sky are? A) rain B) snow C) sleet D) hail

For each case, identify the force (including its direction) that causes the acceleration. (a) A sprinter at the very start of the race.

Select the effects of radiation below that are stochastic: associated with short-term, high-level exposure associated with long-term, low-level exposure include cancer and other DNA mutation include burns and radiation sickness

On the modern periodic table, elements are ordered according to what?

Jack drops a stone from rest off of the top of a bridge that is 24.4 m above the ground. After the stone falls 6.6 m, Jill throws a second stone straight down. Both rocks hit the water at the exact same time.

How is Electric current able to flow?