A planet moves in an elliptical orbit around a star. This is a two-body system. Which of the following must stay constant during the orbit? Kinetic energy of the planet The angular momentum of the planet The potential energy of the system The force on the planet Two of the above answers are correct

Which one of the following situations is an example of an object with a non-zero kinetic energy? a satellite in geosynchronous orbit a boulder resting at the bottom of a cliff a stationary pendulum a drum of diesel fuel on a parked truck a car parked at the top of a hill

Three spheres, with masses indicated above, are initially far away from each other, and the gravitational potential energy of the three-sphere system is zero. The spheres are then brought together until each sphere is a distance r from the other two, as shown above. What is the new gravitational potential energy of the three-sphere system?

A .20 kg baseball is thrown in the air at 18 m/s at an angle of 35 degrees. How much potential and kinetic energy does it have .50 seconds into its flight? What are its potential and kinetic energies at the very top of its arc? Please answer the question on paper. I do not understand when it is typed out. Thank you

A car rounds a freeway exit turn of radius 40m at constant speed of 20m/s. The turn goes 3/4 around(not a full circle). How much work is done by the friction force on the car’s tires that allows it to turn?

A person picks up an iron ball on a rope and starts to spin it around them. The person does 500 J of work to get the mass spinning. While spinning, the person steps onto ice (take friction out of the equation). The result is both the mass and the person are spinning around the same point in space (the mass is circling faster on a larger radius and the man is circling slower on a smaller radius). There is a point between the masses that is stationary. The iron ball has a mass of m = 10 kg. The person has a mass of M = 80 kg. 3 vb Point that masses rotate around M Vp When the person lets go of the rope, how fast will the person move and how fast will the ball move?

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Question: Three identical 5.6 kg spheres are located at 3 of the 4 corners (top left, top right, and bottom right) of a square whose sides are 2.8 m in length. How much work must be done on the gravitational field produced by the spheres in order to remove the top right sphere (place it at infinity)? Assume that the 2 spheres that are left behind (top left, bottom right) remain located on opposite corners of the square. A) 1.50 x 10-9 J B) 5.34 x 10-10 J C) 1.89 x 10-10 J D) 2.67 x 10-10 J E) 5.29 x 10-10 J OA E B. C.

A person picks up an iron ball on a rope and starts to spin it around them. The person does 500 J of work to get the mass spinning. While spinning, the person steps onto ice (take friction out of the equation). The result is both the mass and the person are spinning around the same point in space (the mass is circling faster on a larger radius and the man is circling slower on a smaller radius). There is a point between the masses that is stationary. The iron ball has a mass of m = 10 kg. The person has a mass of M = 80 kg. Vb Point that masses rotate around 3 M ор When the person lets go of the rope, how fast will the person move and how fast will the ball move?

A planet orbits its star in an elliptical orbit. Which of these quantities do not change as the planet orbits? O None of these quantities change as the planet orbits. O All of these quantities change as the planet orbits. O The planet's angular momentum O The planet's potential energy O The planet's kinetic energy