Masses in the universe curve space-time. what does the resulting shape of space-time cause?

a. equilibrium (not the answer)

b. friction

c. length contraction

d. gravity

According to the law of conservation of mass, in a chemical reaction the total starting mass of all the reactants equal the total final mass of all the products. true or false?

What is the measure of a change in an objects velocity?

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?