Some people make the claim that the position of the planets at one\'s birth affe

Question

Some people make the claim that the position of the planets at one's birth affects their lives from that point on. To see why this is silly, we compare the effect of Venus (which is the closest major planet to Earth) to the effect of choosing a different obstetrician. Assume the mass of a newborn baby is 3.5 kg.

A. The mass of Venus is 4.87x10^24 kg. At nearest approach, Venus is 8.0x10^10 m away from the Earth. Find the gravitational force Venus makes on the baby.

B. Compute the force a slender OB/GYN would make; the doctor is 50 kg in mass, and is a minimum of 25 cm from the center of mass of the baby.

Explanation / Answer

a)F=GMm/r^2=6.673*10^-11*4.87*10^24*3.5/(8*10^10)^2=1.78*10^-7N

b)F=GMm/r^2=6.673*10^-11*50*3.5/0.25^2=1.87*10^-7N

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