21st Century Astronomy
21st Century Astronomy
6th Edition
ISBN: 9780393428063
Author: Kay
Publisher: NORTON
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Chapter 12, Problem 27QP
To determine

The ineffectiveness of the hydrogen cyanide released from the tail of the comet Halley on the Earth.

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A comet with a 2km diameter will make a crater about 20 km in diameter. If the comet has a mass of 4.5 x1012kg and impacts the surface at 35 km/sec, what is the kinetic energy of the comet in Joules?
One of the brightest comets of the 20th century was Comet Hyakutake, which passed close to the sun in early 1996. The orbital period of this comet is estimated to be about 30,000 years. Find the semimajor axis of this comet’s orbit. Compare it to the average sun–Pluto distance and to the distance to Alpha Centauri, the nearest star to the sun, which is 4.3 light-years distant.
A comet has a period of 75.3 years and moves in an elliptical orbit in which its perihelion (closest approach to the Sun) is 0.640 AU. Find the semimajor axis of the comet and an estimate of the comet's maximum distance from the Sun, both in astronomical units. (a) the semimajor axis of the comet (in AU) (b) an estimate of the comet's maximum distance (in AU) from the Sun
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