Aspool is placed on table top. the static friction coefficient between the table top and the spool is high.
part (a) if the string is pulled out over the bottom of the axle as shown, in which direction will the spool roll?
multiplechoice :
1) in the same direction as the applied force.
2) it depends on how much force is applied.
3) it will stay in one place and spin.
4) in the opposite direction of the applied force.

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.