Aman is trying to drag a small tree that he cut down. if the static coefficient
of friction of the tree on the ground is 0.5 and the tree weighs 480 n, what is
the minimum amount of horizontal force that the man will need to apply so
that the tree will start moving?

a. 240 n
b. 360 n
c. 480 n
d. 120 n

Aball is tied to the end of a length of string. a student holds one end of the string and whirls it so the ball travels in a vertical circle. first she whirls the ball at a very fast speed, and then she very gradually lowers the speed. where is the ball most likely to be when the string begins to sag? a.) at the top of the circle b.) descending at the midway point between the top and bottom of the circle c.) ascending at the midway point between the top and bottom of the circle d.) at the bottom of the circle