February 13,2008

February 13,2008 - Ratios the logical way(see slide How do...

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February 13, 2008 ***THURSDAY (FREE) AND FRIDAY SCIENCE OF THE SIGNS FISKE PLANETARIUM!! => take notes because you have to write a 2 page paper on it ***ONLINE HW DUE FRIDAY AT 8 PM ***TAKE HOME HW DUE MONDAY AT BEGINNING OF CLASS! These are all types of energy o Kinetic energy o Thermal energy o Gravitational potential energy o Radiative energy Universal law of gravity o F g =G(M 1 M 2 /d^2) o G=6.67 X 10^-11 m^3/(kg s^2)=”the big G” How strong would gravity be at the surface if earth was replaced by a Styrofoam ball of the same mass, but 10 times the radius o 100 times weaker
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Unformatted text preview: Ratios: the logical way (see slide) How do we find out the acceleration due to acceleration? o I.E. how fast do things fall towards the earth? F= G(M 1 M 2 /d^2) F=MA => A=F/M o M 2 =cabbage=M c o M 1 =Earth=M E o d=radius of earth=R E Ac=[GM E M C /R E ^2]/M C A C =GM E /R E ^2 A C =9.8meters/sec^2 DOES NOT DEPEND ON THE MASS OF THE CABBAGE A E =[GM E M C /d^2]/M E A E =GM c /d^2 A E =tiny Which falls faster – a cabbage or a potato? o They both hit at the same time...
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