Two objects were lifted by a machine. one object had a mass of 2 kilograms and was lifted at the speed of 2 m/s. the other had a mass of 4 kilograms and was lifted at a rate of 3 m/s. which object had more potential energy when it was lifted to a distance of 10 meters
after a large snowstorm you shovel 2000 kilograms of snow off your side walk in 1 hour. you lift the shovel to an average height of 1.25 meters while you are piling the snow in your yard. how much work did you do?
Which of the following contains the majority of the mass in the solar system? A.Earth B.Jupiter C.the sun D.the moon
What is one factor that helps keep the planets and other solar system objects in orbit around the sun? A.nuclear fusion in the sun B.the great distance between the sun and the planets C. force of gravity the galaxy exerts on all objects in it D.the gravitational force between the sun and each object in the solar system
From which of the following do most astronomers today think that the solar system formed? A.the sun B.asteroids C.shooting stars D.a nebula
Which best describes the moon’s regolith? A.weathered rock and organic material B.dust and rocks C.water and small organisms D.ice and gas
Why do we see only one side of the moon from earth? A.The moon does not rotate. B.The moon takes longer to rotate than to revolve around earth. C.The moon takes less time to rotate than to revolve around earth. D.The moon’s period of rotation and revolution are equal.
Kenny, who has a mass of 15 kg, slides down a friction-less slide that is 3.2 m tall. Cartman, who has a mass of 85 kg, slides down the same slide. A. What speed does Kenny reach at the bottom of the slide? B. What speed does Cartman reach the bottom of the slide? C. Kyle slides down the same slide. What speed does Kyle reach at the bottom of the slide? Explain.
