According to the nebular theory, how did the Oort cloud form? a. It consists of objects that fragmented from the protosun during a catastrophic collision early in the formation of the solar system. b. It is made of planetesimals formed in the outer solar system that were flung into distant orbits by encounters with the jovian planets. c. It is made of planetesimals between the orbits of Mars and Jupiter that never formed into a planet. d. It is material left over from the interstellar cloud that never contracted with the rest of the gases to form the solar nebula.

im not to sure what it is

air exerts forces on falling objects near earth’s surface.

explanation:

the term 'free falls' refer to object that are falling towards the earth, in a situation in which gravity is the only force acting on the object.

for an object in free fall, the acceleration is constant (g, the gravitational acceleration), and so the velocity of the object constantly increases.

for objects near earth's surface, there is always another force acting on the object: the resistance due to the air. this force is opposed to the direction of fall of the object, and it is proportional to the velocity of the object, so as the object falls down, this force increases up to a point when it balances the force of gravity, and the object continues its motion at constant velocity (called terminal velocity). since in this case gravity is not the only force acting on the object, we are not in a situation of free fall.

see the picture for the vector

the magnitude of the vector by pythagorean theorem

r = √( (-10)^2 + (3)^2 ) = √109

magnitude = √109 units

the direction angle between vector and x-axis is

tan^(-1)(3/10) = 16.699

so the direction is approximately 16.7 degrees north of west