b.3.73 m/s2If the mass of Mars is 0.107 times that of Earth, and its radius is 0.530 that of Earth,estimate the gravitational acceleration g at the surface of Mars. (gearth = 9.80 m/s2)a.2.5 km/sThe escape speed from the surface of the Earth is 11.2 km/s. Estimate the escapespeed for a spacecraft from the surface of the Moon. The Moon has a mass 1/81 that ofEarth and a radius 0.25 that of Earth.b.333 NGeosynchronous satellites orbit the Earth at a distance of 42 000 km from the Earth'scenter. Their angular speed at this height is the same as the rotation rate of the Earth,so they appear stationary at certain locations in the sky. What is the force acting on a 1500-kg satellite at this height?d.not given.At an altitude of 4 times the radius of the earth, the acceleration due to gravity isCSuppose the gravitational potential energy for a mass at an altitude of one Earth radiusis PE1 and at two Earth radii is PE2. How do the absolute values of these potentialenergies compare?b.6.5 AUAn asteroid has a perihelion (the orbit's closest approach to the sun) of 1.5 AU and aperiod of revolution of 8.0 y. What is its greatest distance from the sun (its aphelion)?d.22.6Two satellites are monitored as they orbit the Earth; satellite X is eight times as far fromthe Earth's center as is satellite Y. From Kepler's third law one may conclude that theperiod or revolution of X is what factor times that of Y?a.nearest the EarthAt what location does an artificial Earth satellite in elliptical orbit have its greatestspeed?b.2 km/s

An asteroid in orbit about the sun has a linear speed of 4 km/s when at a distance ofclosest approach d from the sun. What is its linear speed when it is at its greatestdistance from the sun, a distance 2 d?a.nearest the EarthAn artificial Earth satellite in an elliptical orbit has its greatest centripetal accelerationwhen it is at what location?b.greater when the orbital radius is largerWhich of the following best describes the property of the period of orbital revolution foran Earth satellite?a.greatest centripetal acceleration.Of the nine known planets in our solar system, the innermost is Mercury. Whencompared to the other planets in the system, Mercury has the:a.nothingAccording to Kepler's second law, Halley's Comet circles the Sun in an elliptical pathwith the Sun at one focus of the ellipse. What is at the other focus of the ellipse?a.1.8 yearsFor any object orbiting the Sun, Kepler's Law may be written T2 = kr3. If T is measuredin years and r in units of the Earth's distance from the Sun, then k = 1. What, therefore,is the time (in years) for Mars to orbit the Sun if its mean radius from the Sun is 1.5times the Earth's distance from the Sun?b.be over the equator.In order for a satellite to be geosynchronous, its orbit must:c.8 yearsAn asteroid is in orbit at 4 times the earth's distance from the Sun. What is its period ofrevolution?

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Term

Spring

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SADNESS

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