A 3-kg newborn baby at the Earth’s surface is gravitationally attracted to Earth with a force of about 30 N. (a) Calculate the force of gravity with which the baby on Earth is attracted to the planet Mars when Mars is closest to Earth. (The mass of Mars is 6.4 × 1023 kg and its closest distance is 5.6 × 1010 m.) (b) Calculate the force of gravity between the baby and the physician who delivers it. Assume the physician has a mass of 100 kg and is 0.5 m from the baby. (c) How do the forces compare?
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