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1. [#851] Two students 1 point In the queue at the bus stop, two students (with masses 80 and 60 kg
respectively) are standing a distance 0.7 m apart. What is the magnitude of the gravitational force
between them? Treat both objects as point masses, use G = 6.67 x 10-1l Nm'kg-2. F =_ micr... 

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5. [#855] Kepler's Law of Periods (Part 2) 1 point Let's use Kepler's laws for the inner planets. Use the
following distances from the sun to calculate the orbital period for each of these planets. Express your
answer in terms of Earth years to two significant figures. Note: Use Kepler's law directly. D... 

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8. [#858] Energy per kilo (Part 1) 1 point Consider the mechanical energy of a body in geostationary
orbit above the Earth's equator, at rGs = 42000 km. Consider the mechanical energy of the same body
on Earth at the South pole, at Te = 6400 km. For this problem, we consider the Earth to be..