8. Suppose rockets were used to launch the satellite from the north pole to its orbit, howmuch work did the rockets do? (Neglect any change in mass due to fuel ejection.)1 GmM1 GmM3 GMMGmMA)B)C).D)4 R2 R4 RR

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Answered: 8. Suppose rockets were used to launch…

College Physics

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Chapter6: Momentum And Collisions

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Professional Application Ion-propulsion rockets have been proposed for use in space. They employ atomic ionization techniques and nuclear energy sources to produce extremely high exhaust velocities, perhaps as great as 8.00106 m/s. These techniques allow a much more favorable payload-to-fuel ratio. To illustrate this fact: (a) Calculate the increase in velocity of a 20,000-kg space probe that expels only 40.0-kg of its mass at the given exhaust velocity. (b) These engines are usually designed to produce a very small thrust for a very long time—the type of engine that might be useful on a trip to the outer planets, for example. Calculate the acceleration of such an engine if it expels 4.50106 kg/s at the given velocity, assuming the acceleration due to gravity is negligible.
Professional Application Calculate the increase in velocity of a 4000-kg space probe that expels 3500 kg of its mass at an exhaust velocity of 2.00103 m/s. You may assume the gravitational force is negligible at the probe's location.
5. If a Saturn V rocket with an Apollo spacecraft attached has a combined mass of 2.9 x 10% kg and is to reach a speed of 11.2 km, how much kinetic energy will it then have?
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A satellite of mass 243kg orbits the Earth at a constant speed in a circular orbit. The work done by the Earth on the satellite is a. negative. b. zero. c.directed towards the centre of the orbit. d. [None of the others.] e. positive. f.directed along a tangent to the orbit.
5. How much work must be done by a rocket engine to lift a 1000 kg payload from rest on the earth's surface to a circular orbit of radius 2R,?
Item 9 Part A Find the minimum kinetic energy needed for a 4.6×104-kg rocket to escape the Moon. Express your answer in joules. ► View Available Hint(s) Kmin = Submit Part B Kmin VE ΑΣΦ Submit B Find the minimum kinetic energy needed for a 4.6×104-kg rocket to escape the Earth. Express your answer in joules. ► View Available Hint(s) ΑΣΦ []? J ] ? J
Q19 The concept of escape velocity can be best described as: (A) The initial speed required so that an object will safely orbit the Earth. (B) The speed for an object to be launcned and fly through space forever. (C) The speed necessary for a spacecraft to escape Earth's atmosphere. (D) The velocity needed to provide an initial kinetic energy such that total mechanical energy is zero.
If a Saturn V rocket with an Apollo spacecraft attached had a combined mass of 2.9 × 105 kg and reached a speed of 12 km/s, how much kinetic energy would it then have? In 2nd significant digit
16. A 20 000-kg meteorite from outer space is headed directly toward Earth with a speed of 3.0 km/s. Find its speed when it is 200 km above Earth's surface.
%20tiene%20una%20masa%20de%20100%20kg%20y%20se%20encuentra%20a%20u... INGLÉS ESPAÑOL FRANCÉS A satellite of the Earth has a mass of 100 kg and is at a height of 2.0x10 3 km above the earth's surface. Determine the gravitational potential energy of the Earth-satellite system. Enviar com Tardado

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8. Suppose rockets were used to launch the satellite from the north pole to its orbit, how much work did the rockets do? (Neglect any change in mass due to fuel ejection.) 1 GmM 1 GmM 3 GMM GmM A) B) C). D) 4 R 2 R 4 R R