Below is a diagram of the orbits of the inner planets examine the diagram and answer questions three and four  HELP!! 3 and 4

What is the force that opposes motion and works against the downward pull? a) friction b) gravity c) weight d) acceleration

What characteristics of hv2112 make it the best candidate to be classified as a thorne-zytkow object?

Ablock of mass m = 2.5 kg is attached to a spring with spring constant k = 740 n/m. it is initially at rest on an inclined plane that is at an angle of theta= 26 with respect to the horizontal, and the coefficient of kinetic friction between the block and the plane is uk = 0.17. in the initial position, where the spring is compressed by a distance of d = 0.16 m, the mass is at its lowest position and the spring is compressed the maximum amount. take the initial gravitational energy of the block as zero. the block's initial mechanical energy is 9.472 j.b. if the spring pushes the block up the incline, what distance l in meters will the block travel before coming to rest? the spring remains attached to both the block and the fixed wall throughout its motion.