It is likely that the density of the universe is made up mostly of

Picture a all traveling at a constant speed around the inside of a circular structure. is the ball accelerating? explain your answer

When an object is heated it contracts. a. true b. false

Students design a model roller-coaster track. they place a rubber ball at the highest point on the track and let it go. the ball rolls along the track pulled only by the force of gravity. eventually, it comes to a stop. which change to the design will result in the ball moving the greatest distance?