A spy satellite completes six revolutions every day in a circular orbit. Determine the altitude of the satellite above Earth's surface. the speed of the satellite.

A 1 013-kg satellite orbits the Earth at a constant altitude of 99-km. (a) How much energy must be added to the system to move the satellite into a circular orbit with altitude 208 km? MJ (b) What is the change in the system's kinetic energy? MJ (c) What is the change in the system's potential energy? MJ Need Help? Read It Watch It

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lo and Europa are two of Jupiter's moons. lo orbits closer to Jupiter than Europa. Assume that both moons have the same mass. Which statement is true? lo has more kinetic energy, less potential energy, and more mechanical energy (potential plus kinetic) than Europa. lo has more kinetic energy, less potential energy, and less mechanical energy (potential plus kinetic) than Europa. lo and Europa have the same amount of mechanical energy (potential plus kinetic). lo has more kinetic energy, more potential energy, and more mechanical energy (potential plus kinetic) than Europa.

5. An electron strikes the screen of a cathode-ray tube with a velocity of 10 m/s. Compute its kinetic energy in joules. The mass of an electron is 9.11 x 10 -³¹ kg. 6. A body of mass 2 kg. is initially at rest on a horizontal frictionless plane. It is the pulled 4 meters by a horizontal force of magnitude 25 N. Use the work-energy relation to find its final speed. 7. In problem 6, suppose the body has an initial velocity of 10m/s and is then pulled 4 meters by a force of magnitude 25 N in the direction of the initial velocity, what is its final velocity?

15. A 550-kg satellite projected upward from Earth's surface reaches a maximum height of 6000 km. Find a) its change in gravitational potential energy. b) its initial kinetic energy.

What is the kinetic energy of a 1400 kg car traveling at 5,35 7.4x 10 J 2.0x 10 J C. 7.3x 10 J 2.8 x 107 J

A camera weighing 15 N falls from a small drone hovering 35 m overhead and enters free fall. What is the gravitational potential energy change of the camera from the drone to the ground if you take a reference point of a. the ground being zero gravitational potential energy? APE b. The drone being zero gravitational potential energy? APE What is the gravitational potential energy of the camera (with the reference point of zero gravitational potential energy taken to be a second person looking out of a building 30 m from the ground) c. before it falls from the drone? PE=| d. after the camera lands on the ground? PE Submit Question

Two 0.56-kg basketballs, each with a radius of 15 cm, are just touching. Part A How much energy is required to change the separation between the centers of the basketballs to 1.0 m ? (Ignore any other gravitational interactions.) Express your answer in joules. ► View Available Hint(s) AU = Submit Part B AU = VE ΑΣΦ Submit How much energy is required to change the separation between the centers of the basketballs to 14 m ? (Ignore any other gravitational interactions.) Express your answer in joules. ► View Available Hint(s) B VE ΑΣΦ ? X ? J

A 0.25 kg ball is suspended from a light 1.2 m string as shown. The string makes an angle of 35° with the vertical. Let U = 0 when the ball is at its lowest point (θ = 0). Part A: Draw diagram and label coordinates.  Part B: What is the gravitational potential energy, in joules, of the ball before it is released?  Part C: What will be the speed of the ball, in meters per second, when it reaches the bottom?  Part D: Does replacing the ball by a steel sphere of mass 0.75kg at the end increase the maximum speed?