21st Century Astronomy
21st Century Astronomy
6th Edition
ISBN: 9780393428063
Author: Kay
Publisher: NORTON
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Chapter 12, Problem 37QP
To determine

The probability of a meteorite striking in the area of 0.25m2 in a life time of 100years.

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A submersible robot is exploring one of the methane seas on​ Titan, Saturn's largest moon. It discovers a number of small spherical structures on the bottom of the sea at depth of 10 meters​ [m], and selects one for analysis. The sphere selected has a volume of 1.9 cubic centimeters ​[cm3​] and a density of 2.25 grams per cubic centimeter ​[g/cm3​]. When the rock is returned to Earth for​ analysis, what is the weight of the sphere in newtons​ [N]? Gravity on Titan is 1.352 meters per second squared ​[m/s2​]. The density of methane is 0.712 grams per liter​ [g/L] The weight of the sphere is ____ N.
( a) Calculate the equilibrium temperature of a meteoroid of mass M, density ρ, and albedo A in the vicinity of the Earth. (b) Evaluate your result for a chondrite with M = 10^9 g, ρ = 2.5 g cm^− 3, and albedo A = 0.05 and for an achondrite with M = 10^6 g, ρ = 3 g cm^− 3, and albedo A = 0.3.
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.
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