Muriel

skier of mass 79 kg is pulled up a slope by a motor-driven cable. (a) How much work is required to pull him 80 m up a 30° slope (assumed frictionless) at a constant speed of 3.4 m/s? 1 J (b) What power (expressed in hp) must a motor have to perform this t...

The length of a telescope has a radius of 1 meter what is the len's circumference use 3.14 for

I can calculate it I need help please