An object slides down a rough inclined plane with some non-zero acceleration a1. (There is friction).The same mass is shoved up the same incline with a large, brief initial push. As the mass moves up the incline, its acceleration is a2. Which of the following statements about the magnitudes of these accelerations is true?

a. a1=a2
b. Not enough information
c. a1> a2
d. a2> a1

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Abird flies directly overhead from where you stand at an altitude of 300.0 m and at a speed horizontal to the ground of 20.0 m/s. the bird has a mass of 2.0 kg. the radius vector to the bird makes an angle \thetaθ with respect to the ground. the radius vector to the bird and its momentum vector lie in the xyxy-plane. what is the bird’s angular momentum about the point where you are standing?

Suppose that three astronomical objects, 1, 2, and 3 are observed to lie on a line, and the distance from object 1 to object 3 is d. object 1 has four times the mass of object 3, and seven times the mass of object 2. find the distance between objects 1 and 2 for which the net force on object 2 is zero.