A spherical interplanetary grain of dust of radius 0.2 mm is at a ...

[panfilo]

A spherical interplanetary grain of dust of radius 0.2 mm is at a 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 Suns light. Suppose the grain is compressed so that it crystallizes into a sphere with significantly higher density, still at a distance r1. What is the net force exerted on the grain?
  1.toward the Sun
  2.away from the Sun
  3.zero
  4.impossible to determine without knowing the mass of the grain

Question 2

A spherical interplanetary grain of dust of radius 0.2 mm is at a 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 Suns 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?
  1.toward the Sun
  2.away from the Sun
  3.zero
  4.impossible to determine without knowing the mass of the grain

[chevyboi1976]

Answer to Question 1

1

Answer to Question 2

3

[panfilo]

Thanks for the timely response, appreciate it

[xiazhe]

TYSM