The following information pertains to questions 1-6.

Two spherical planets with radii R₁ = 2 R_o and R₂ = R_o and masses m₁ = 2 m_o and m₂ = m_o respectively are in circular orbits of radii r₁ = 2 r_o and r₂ = r_o respectively about the same star which has mass M_s >> m_o. Much of this is depicted in the following figure.

The speed of the first planet in its orbit is ___ the speed of the second planet in its orbit.

The magnitude of the gravitational force exerted by the star on the first planet is ___ the magnitude of the gravitational force exerted by the star on the second planet.

The acceleration of gravity on the surface of the second planet is ___ the acceleration of gravity on the surface of the first planet.

The magnitude of the gravitational force exerted on the first planet by the second planet is ___ the magnitude of the gravitational force exerted on the second planet by the first planet.

The magnitude of the gravitational force exerted by the sun on the first planet is ___ the magnitude of the gravitational force exerted by the sun on the second planet.