A spherical interplanetary dust grain of radius 0.2 ? m is at distance r 1 from

Question

A spherical interplanetary dust grain of radius 0.2 ?m is at distance r1 from the Sun. The gravitational force exerted by the Sun on the grain just balances the force due to radiation pressure from the Sun's light. Assume the grain is moved to a distance 2r1 from the Sun and released. At this location, what is the net force exerted on the grain?

A.toward the Sun

B.away from the Sun

C.zero

D.impossible to determine without knowing the mass of the grain

(b)

Now assume the grain is moved back to its original location at r1, compressed so that it crystallizes into a sphere with significantly higher density, and released. In this situation, what is the net force exerted on the grain?

A.toward the Sun

B.away from the Sun

C.zero

D.impossible to determine without knowing the mass of the grain

Explanation / Answer

A

B

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