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LAB ex 1 - Karla Peck Astronomy Exercise I Show your work 1...

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Karla Peck Astronomy Exercise I Show your work! 1. Write down the abbreviation for the following quantities, which are also non-SI units, and then define them: a. light year: ly, The distance that light travels in a vacuum in 1 year. b. parsec: pc, A unit of distance equal to 3.26 light-years. c. megaparsec: Mpc, One million parsecs. d. arcsecond: arcsec, One- sixtieth of a minute of arc. e. Astronomical Unit : AU, The average distance between the Earth and the Sun: 1.5 108 km = 93 million mi. f. degree: A unit of angular measure or a temperature measure. 2. Express the following in scientific notation: a. The distance to Sirius from Earth, 81,480,000,000,000,000 m 2.6 parsecs (8.6 light-years) b. The radius of a hydrogen atom, 0.00000000005392 m 10^-10m 3. A comet with a radius of 15 km has a mass of 10 11 kg and is traveling at 28 km/s (relative to Earth). What is the kinetic energy of the asteroid in Joules? (Hint: First convert 28 km/s to m/s then use the equation for kinetic energy on page 56.)

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Karla Peck 4. If the asteroid in question 3 were to impact Earth at this speed, what would the energy released be in tons of TNT? If you did not get an answer to 3, assume the answer was 4.14 x 10 16 J. (1 ton of TNT = 4.184 x 10 9 J) 5. What is the gravitational potential energy of a 400 kg satellite that is orbiting the earth at 400 km above the surface of the earth? (Hint:
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LAB ex 1 - Karla Peck Astronomy Exercise I Show your work 1...

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