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posted by  oxlsu on 11/4/2009 9:33:50 PM  |  status: Live  |  Earned Karma: 25

Gravitation

Course Textbook Chapter Problem Needs by
Calculus Based Physics Fundamentals of Physics Extended (8th) by Halliday, Resnick, Walker N/A N/A 11/6/2009 at 8:00:00 AM
Question Details:
Calculate the amount of energy required to escape from the surface of the following bodies, relative to that required to escape from the surface of Earth.
(a) Mars
Enter a number.
1 multiplied by energy to escape Earth
(b) Venus
Enter a number.
2 multiplied by energy to escape Earth

Help! lol
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posted by watt (MNK) on 11/4/2009 9:48:10 PM  |  status: Live
Asker's Rating: Somewhat Helpful   
Response Details:
Modified :
-----------
Energy rrquired to escape the body E  = [ GMm / R ]
                        E α [ M / R ]
           ( E m/ Ee) = [ ( Mm/Me) ( Re/Rm)]
                            = [ ( 6.4191 × 1023 kg / 5.98*10^24 kg ) ( 6.38*10^6 m / 3.397*10^6 m ) ]
                            = 0.2061
                      Em = 0.2061 Ee
(b). ( E v/ Ee) = [ ( Mv/Me) ( Re/Rv)]
                      = [ ( 4.86900 × 1024 kg / 5.98*10^24 kg ) ( 6.38*10^6 m / 6.051*10^6 m ) ]
                            = 0.8584  
                      Em = 0.8584Ee
Novice
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posted by oxlsu on 11/4/2009 10:12:32 PM  |  status: Live
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Response Details:
Is this calculating the escape energy or escape speed?
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posted by oxlsu on 11/4/2009 10:50:59 PM  |  status: Live
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Response Details:
I need the energy, not the speed :(
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