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 33QAP
To determine
The reason why should we be concerned about the possibility of collisions of comet and asteroids.
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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.
There is a cloud of marbles far out in space. The distance from one end of the cloud to the other is D , and the marbles all have mass m . Near the cloud are two asteroids. One of the asteroids has mass Ma and is located a distance D from the near edge of the cloud, whereas the other has mass 12Ma and is located a distance 3D from the near edge of the cloud, as shown in the illustration.
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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- ____ daysarrow_forwardA lot of asteroid and comet dust collides with Earth's atmosphere everyday. Assume that 500 tons of mass is added to Earth daily from the millions of meteors that enter our atmosphere. Estimate the time it would take for the Earth's mass to increase 0.2% with this impact rate. Is this mass accumulation significant to Earth as a planet.arrow_forwardThere is one part to this question. I need to know the days. Thank you!arrow_forward
- Please asaparrow_forwardA comet with a 2 km diameter will make a crater about 20 km in diameter. If the comet has a mass of 5.4 × 1012 kg and impacts the surface at 35 km/sec, what is the kinetic energy of the comet in Joules?arrow_forwardFind the mass of a hypothetical spherical asteroid 4 km in diameter and composed of rock with an average density of 2400 km/ cubic meter. (b) Find the speed required to escape from the surface of this asteroid. (c) A typical jogging speed is 3 m/s. What would happen to an astronaut who decided to go for a jog on this asteroid?arrow_forward
- Consider a spherical asteroid with a density ρ = 3 g/cm3 and a radiusR = 100 km. If its surface is covered with a thin layer of (loosely bound) regolith, what isthe shortest rotation period it can have without losing the regolith at its equator?arrow_forwardA 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?arrow_forwardd) The internal density of the comet 67P was measured by the Rosetta space-craft to be approximately p = 400 kg m-³. How close an approach to the Earth could be made by this comet before it is tidally disrupted? Express your answer in units of the Earth's radius. Ignoring the effects of heating and sublimation, state how close this comet could approach the Sun without being tidally disrupted. Express your answer in units of the Solar radius.arrow_forward
- What is the escape velocity from an asteroid with a diameter of 100 km and an average relative density of 2.5? (The solution is 59 m/s)arrow_forwardSuppose an asteroid has a tiny moon orbiting around it (which does occur). If the moon is 1.1 km wide, is 142 km from the center of the asteroid (which is 36 km in diameter), and assuming the moon has a circular orbit around the asteroid of period 36 hours, what is the mass of the asteroid? m = kg [Note: Use exponential notation for your answer with a format "9.99E12" for 9.99 x 1012.] What would the radius of the orbit of the same tiny moon be if it had an orbital period of 50.9 hours? Give your answer in km: R = km What is the density of the asteroid? Recall that density is mass per unit volume. The volume of the asteroid can be calculated based on its diameter (assume it is spherical in shape). Р kg/m³arrow_forwardA sample from a meteorite that landed on Earth has been analyzed, and the results shows that out of every 1,000 nuclei of potassium- 40 originally in the meteorite, only 125 are still present, meaning they have no yet decayed. How old is the meteorite (in yr)? (Hint: see the figure below) (Note: The half life of potassium- 40 is 1.3 billion years.) _______ yrarrow_forward
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