An 7.5 crate is pulled 5.4 up a 30 degree incline by a rope angled 19 degrees above the incline. The tension in the rope is 130N and the crate's coefficient of kinetic friction on the incline is 0.24.

Question

An 7.5 crate is pulled 5.4 up a 30 degree incline by a rope angled 19 degrees above the incline. The tension in the rope is 130N and the crate's coefficient of kinetic friction on the incline is 0.24.
How much work is done by tension? by gravity? by the normal force?

drwls · Answer

<> (tension component up incline)*(distance) << by gravity?>> -(vertical rise)*(weight) <> zero, because it is perpendicular to the motion Your 7.5 and 5.4 numbers require dimensions. Surely you have learned that by now.