Homework Help: PHYSICS HELP!

Posted by Anonymous on Tuesday, July 24, 2012 at 12:08pm.

IMAGINE- a building 6400km. high. On the ground floor, a person weighs 175lbs when he steps on a spring scale how much would the man weigh on the same scale if he were standing at the top floor? HINT: Note that 6400km is also the radius of the earth so that the top floor is 2Re from the earths center. Think about what this means for Fgrav before you start plugging in numbers or making conversions

I KNOW THIS MUCH----- confuesed what to plug in where. and what not to plug in. The weight is equal ‘mg”
On the Earth surface acceleration due to gravity is
mg=GmM/R²,
g=G•M•/R²,
where
the gravitational constant G =6.67•10^-11 N•m²/kg²,
Earth’s mass is M = 5.97•10^24 kg,
Earth’s radius is R = 6.378•10^6 m.
g=9.8 m/s²

Let's find “g” at the height “h” . Distance between the mas “m” (the person) and the center of the Earth is 2R =>
m•g1= G•m•M/(2R)²
g1= G•M/4R²=g/4

In the "high" building mg1= mg/4

•answered below - Damon, Monday, July 23, 2012 at 7:32pm

if r = 2R then r^2 = 4 R^2
then weight = (1/4) original

•PHYSICS! okay so would it be
(6.67*10^-11)(5.97*10^24)(77.87)/4(6.378*10^6)^2?!?!?!

PHYSICS HELP! - Damon, Tuesday, July 24, 2012 at 12:42pm
175/4
PHYSICS HELP! - Damon, Tuesday, July 24, 2012 at 12:43pm
Read the HINT !!!
PHYSICS HELP! - Anonymous, Tuesday, July 24, 2012 at 1:37pm
okay sorry i dont understand physics. where did you get the 4 from? 2^2?!

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