Astronomy Question: If the semi-major axis of Mar's elliptic orbit is a= 228*10^9m. Then what will be the time period of the revolution of mars (T) around the sun in days? Hint: use Kepler's 3rd law of motion (T2 α a3).

Scientific models are based on current knowledge, which can limit their effectiveness when new discoveries are made.

Asled is being held at rest on a slope that makes an angle θ with the horizontal. after the sled is released, it slidesa distance d1 down the slope and then covers the distance d2 alongthe horizontal terrain before stopping. find the coefficient ofkinetic friction μk between the sled and the ground, assumingthat it is constant throughout the trip. find the coefficient of kinetic frictionμk. express your answer in terms of someor all of the variables d1, d2, and θ.

M1 = 2.8 kg, m2 = 6.72 kg, m3 = 11.2 kg, byas in .is ,is .toof m3 it 0.91 m. (in m/s)