Understanding Our Universe
3rd Edition
ISBN: 9780393614428
Author: PALEN, Stacy, Kay, Laura, Blumenthal, George (george Ray)
Publisher: W.w. Norton & Company,
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Chapter 9, Problem 28QAP
To determine
The reason why it is nearly impossible that main-belt asteroids will coalesce to form a planet.
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Calculate the first cosmic velocity for the asteroid with radius 13 km and
mass 43 940 000 Mtn.
A 0.872 km diameter asteroid will make a crater about 10 km in diameter. Let the asteroid have a density of 3000 kg/m3 and impact the surface at 22 km/sec. Assuming a spherical asteroid, what is the kinetic energy (in joule) of the asteroid? Convert the answer to megatons of TNT, where 1 megaton is about 4 × 1015 joule. For comparison, the most energetic weapon in the human arsenal is about 100 megatons.
The Near Earth Asteroid Rendezvous (NEAR), after traveling 2.1 billion kmkm, is meant to orbit the asteroid Eros at a height of about 15 kmkm. Eros is roughly 40km×km× 6km×km×6kmkm. Assume Eros has a density (mass/volume) of about 2.3×103kg/m32.3×103kg/m3.
Part A
What will be the period of NEAR as it orbits Eros?
Chapter 9 Solutions
Understanding Our Universe
Ch. 9.1 - Prob. 9.1CYUCh. 9.2 - Prob. 9.2CYUCh. 9.3 - Prob. 9.3CYUCh. 9.4 - Prob. 9.4CYUCh. 9.5 - Prob. 9.5CYUCh. 9.6 - Prob. 9.6CYUCh. 9 - Prob. 1QAPCh. 9 - Prob. 2QAPCh. 9 - Prob. 3QAPCh. 9 - Prob. 4QAP
Ch. 9 - Prob. 5QAPCh. 9 - Prob. 6QAPCh. 9 - Prob. 7QAPCh. 9 - Prob. 8QAPCh. 9 - Prob. 9QAPCh. 9 - Prob. 10QAPCh. 9 - Prob. 11QAPCh. 9 - Prob. 12QAPCh. 9 - Prob. 13QAPCh. 9 - Prob. 14QAPCh. 9 - Prob. 15QAPCh. 9 - Prob. 16QAPCh. 9 - Prob. 17QAPCh. 9 - Prob. 18QAPCh. 9 - Prob. 19QAPCh. 9 - Prob. 20QAPCh. 9 - Prob. 21QAPCh. 9 - Prob. 22QAPCh. 9 - Prob. 23QAPCh. 9 - Prob. 24QAPCh. 9 - Prob. 25QAPCh. 9 - Prob. 26QAPCh. 9 - Prob. 27QAPCh. 9 - Prob. 28QAPCh. 9 - Prob. 29QAPCh. 9 - Prob. 30QAPCh. 9 - Prob. 31QAPCh. 9 - Prob. 32QAPCh. 9 - Prob. 33QAPCh. 9 - Prob. 34QAPCh. 9 - Prob. 35QAPCh. 9 - Prob. 36QAPCh. 9 - Prob. 37QAPCh. 9 - Prob. 38QAPCh. 9 - Prob. 39QAPCh. 9 - Prob. 40QAPCh. 9 - Prob. 41QAPCh. 9 - Prob. 42QAPCh. 9 - Prob. 43QAPCh. 9 - Prob. 44QAPCh. 9 - Prob. 45QAP
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- Compare asteroids of the asteroid belt with Earth-approaching asteroids. What is the main difference between the two groups?arrow_forwardIf the velocity of the solar wind is about 4.0 102 km/s and the visible tail of a comet is 1.0 108 km long, how many days does an atom in the solar wind take to travel from the nucleus to the end of the visible tail? (Nate: 1 day = 86,400 seconds.)arrow_forwardGive at least two reasons today’s astronomers are so interested in the discovery of additional Earthapproaching asteroids.arrow_forward
- What evidence indicates that the asteroids are mostly fragments of larger bodies?arrow_forwardExplain why visual observation of the gas giants is not sufficient to determine their rotation periods, and what evidence was used to deduce the correct periods.arrow_forwardApproximately how many asteroids that are 0.99 km in radius would it take to make a planet which has a radius of 6460.0 km?arrow_forward
- The Tunguska asteroid is estimated to have had a diameter of 50 m, and to have produced an explosion equivalent to 10 megatons of TNT (1 megaton = 4.2 x 1015 joules). Assume that the asteroid was a sphere with density 2 g/cm3. Using the kinetic energy formula K = ½ mv2, where m is the mass and v is the speed, to estimate the speed of the asteroid. Assume that all kinetic energy is converted into the energy of the explosion. Give your answer in km/s with one significant figure.arrow_forwardWhat is the relative velocity and impact energy of the Earth and an asteroid on 10/8/2023 with: a) a diameter of 25 meters, aphelion at the Earth and perihelion at Venus b) a diameter of 1 km and perihelion at Earth and aphelion in the asteroid belt (2.5 AU)arrow_forwardSuppose there are approximately 8.0×1068.0×106 asteroids in the asteroid belt that have a diameter larger than 0.20.2 km. If the asteroid belt stretches from 1.91.9 AU to 3.73.7 AU, how much space is there for each asteroid? Follow the steps. (There are 149000000.0000149000000.0000 km in 1 AU.)arrow_forward
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