Multiple ChoiceHow much energy is required to move a 1000-kg object from Earth's surface to a height twice Earth's radius?259views3rank
Multiple ChoiceYou launch a rocket with an initial speed of 5×1035\times10^3 m/s from Earth's surface. At what height above the Earth will it have ¼ of its initial launch speed? Assume the rocket's engines shut off after launch.172views2rank
Textbook QuestionTen days after it was launched toward Mars in December 1998, the Mars Climate Orbiter spacecraft (mass 629 kg) was 2.87 * 10^6 km from the earth and traveling at 1.20 * 10^4 km/h relative to the earth. At this time, what were (a) the spacecraft's kinetic energy relative to the earth and (b) the potential energy of the earth–spacecraft system?1475views
Textbook QuestionA rogue band of colonists on the moon declares war and prepares to use a catapult to launch large boulders at the earth. Assume that the boulders are launched from the point on the moon nearest the earth. For this problem you can ignore the rotation of the two bodies and the orbiting of the moon. (a) What is the minimum speed with which a boulder must be launched to reach the earth?Hint: The minimum speed is not the escape speed. You need to analyze a three-body system.99views
Textbook Question(II) For a satellite of mass in a circular orbit of radius r_S around the Earth, determine(b) its potential energy U (U = 0 at infinity) , and112views
Textbook Question(II) Two Earth satellites, A and B, each of mass m = 950 kg , are launched into circular orbits around the Earth’s center. Satellite A orbits at an altitude of 4800 km, and satellite B orbits at an altitude of 12,600 km. (a) What are the potential energies of the two satellites? 116views
Textbook QuestionA rocket is launched straight up from the earth's surface at a speed of 15,000 m/s. What is its speed when it is very far away from the earth?795views1comments
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