7. [-/10 Points] DETAILS SERPSE10 13.4.OP.014.MI.SA. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER This question has several parts that must be completed sequentially. If you skip a part of the question, you will not receive any points for the skipped part, and you will not be able to come back to the skipped part. Tutorial Exercise Plaskett's binary system consists of two stars that revolve in a circular orbit about a center of mass midway between them. This statement implies that the masses of the two stars are equal (see figure below). Assume the orbital speed of each star is [V| = 175 km/s and the orbital period of each is 12.0 days. Find the mass M of each star. (For comparison, the mass of our Sun is 1.99 x 1030 kg.) XCM M Click here to begin! Need Help? Read It 8. [-/10 Points] DETAILS SERPSE10 13.4.OP.016. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER A comet (see the figure below) approaches the Sun to within 0.570 AU, and its orbital period is 79.6 yr. (AU is the symbol for astronomical unit, where 1 AU = 1.50 x 1041 m is the mean Earth-Sun distance.) How far from the Sun will the comet travel before it starts its return journey? AU Sun 0.570 AU (Orbit is not drawn to scale.) Need Help? Read It Watch It 9. [-/10 Points] DETAILS SERPSE10 13.4.OP.017. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER Neutron stars are extremely dense objects formed from the remnants of supernova explosions. Many rotate very rapidly. Suppose the mass of a certain spherical neutron star is twice the mass of the Sun and its radius is 6.0 km. Determine the greatest possible angular speed it can have so that the matter at the surface of the star on its equator is just held in orbit by the gravitational force. rad/s Need Help? Read It Watch It10. [-/10 Points] DETAILS SERPSE10 13.5.OP.018. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER A satellite in Earth orbit has a mass of 102 kg and is at an altitude of 1.93 x 10 m. (Assume that U = 0 as / -+ co.) (a) What is the potential energy of the satellite-Earth system? (b) What is the magnitude of the gravitational force exerted by the Earth on the satellite? N (c) What force, if any, does the satellite exert on the Earth? (Enter the magnitude of the force, if there is no force enter 0.) Need Help? Read it Watch It 11. [-/0 Points] DETAILS SERPSE10 13.6.P.018. MY NOTES ASK YOUR TEACHER A "treetop satellite" moves in a circular orbit just above the surface of a planet, assumed to offer no air resistance. Show that its orbital speed v and the escape speed from the planet are related by the expression Vest = v 2v. (Submit a file with a maximum size of 1 MB.) 19 49 440 19 818 This answer has not been graded yet. Need Help? Read it 12. [-/10 Points] DETAILS SERPSE10 13.6.OP.021.MI.SA. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER This question has several parts that must be completed sequentially. If you skip a part of the question, you will not receive any points for the skipped part, and you will not be able to come back to the skipped part. Tutorial Exercise A space probe is fired as a projectile from the Earth's surface with an initial speed of 2.05 x 10" m/s. What will its speed be when it is very far from the Earth? Ignore atmospheric friction and the rotation of the Earth. Click here to begin! Need Help? Read It 13. [-/10 Points] DETAILS SERPSE10 13.6.OP.022. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER A 959-kg satellite orbits the Earth at a constant altitude of 91-km. (a) How much energy must be added to the system to move the satellite into a circular orbit with altitude 191 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