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 21QAP
To determine
The reason why astronomers are interested in asteroids crossing the Earth’s orbit.
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The asteroid Ceres has a mass of 9.39 ✕ 1020 kg and an average radius of about 473 km (4.73 ✕ 102 km). What is its escape velocity (in m/s)? (Hints: Use the formula for escape velocity)
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Suppose an asteroid has a semimajor axis of 4 AU. How long does it take the asteroid to go around the Sun? (a) 2 years (b) 4 years (c) 6 years (d) 8 years
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
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- An asteroid having a distance of 4.3 x 107 m from a planet revolves around it once every 26.7 days. Calculate (a) its angular speed in rad/s; and (b) the distance it travels in its orbit in one day. Draw an Illustration.arrow_forwardA 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.arrow_forwardWhat determines the velocity with which an asteroid impacts Earth?arrow_forward
- A comet has a period of 70.3 years and moves in an elliptical orbit in which its perihelion (closest approach to the Sun) is 0.620 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 Sunarrow_forwardA 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 Sunarrow_forwardSuppose the gravitational force between two asteroids is 135 N. If one of the asteroids was 4 times more massive, what would be the gravitational force between them?arrow_forward
- 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?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_forwardWhat would be the period of a (hypothetical) solar-system planet whose orbit has a semimajor axis of 4 AU? Of an asteroid with a semimajor axis of 10 AU?arrow_forward
- Another comet has an orbit about the sun whose semi-major axis is 12 AU, with an eccentricity of 0.77. What is the closest that this comet gets to the Sun during the course of its orbit? Answer in AU, but with just a numberarrow_forwardOne 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.arrow_forwardAn asteroid has a mass of 3.66 × 10kg and a radius of 8.2 × 10m. If a 25 kg mass is dropped from 10 m above the “ground” of the asteroid, how long will it take the mass to fall to the ground?arrow_forward
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