Acertain planet has an escape speed v. if another planet has twice the radius and twice the mass of the first planet, its escape speed will be
1. v.
2. v/ 2
3. √.2
4. √ v.
5. 2v.

Scientists discovered fossils in several layers of the earth you see here. they found fossils of algae, snails, and clams in layer d. given that information, where do you think they found fossil evidence of simple land plants and amphibians?

Diego is trying to lift a piano to the second floor of his house. diego uses a pulley system and gives a big lift to the piano. the piano moves upward, then stops, and then it starts to fall to the ground. which list best describes the forces on the piano in the proper order? a.positive force, balanced force, negative force b.negative force, balanced force, positive force c.positive force, unbalanced force, negative force d. negative force, unbalanced force, positive force

If the moon rises at a given location at 6: 00 p.m. today, about what time will it rise tomorrow night?