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October 21, 2014

October 21, 2014

Posted by **roslin** on Wednesday, October 27, 2010 at 7:37am.

- calculus problem -
**bobpursley**, Wednesday, October 27, 2010 at 9:20amI like it in this form:

1/o + 1/i = 1/f for object, image, and focal length.

take the derivative:

-do/dt* 1/o^2 -di/dt 1/i^2= 0 (f is a constant0

do di/dt= -(i/o)^2 do/dt

Can you take it from here?

- calculus problem -
**Kim**, Sunday, September 11, 2011 at 4:29pmSuppose and object is traveling directly from the earth to moon. The mass of the earth is 5.9742 x10^24 kg, the mass of the moon is 7.349 x 10^22 kg, and the mean distance from the earth to the moon is 384,000km. For an object between the earth and the moon, how far from earth is the force of the object due to the moon greater than the force on the object due to earth?

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