Achair weighing 150 rests on a level floor that is not
frictionless. a man pushes on the chair with a force = 43.0 that is
directed at an angle of 34.0 with the horizontal. assume that the
chair is stationary but is on the verge of sliding.
using newton's laws, calculate , the magnitude of the normal force
that the floor exerts on the chair.
what is the coefficient of static friction, , between the floor and
the chair? recall that the chair is on the verge of sliding.

An external consultant recommends that a plant installs a bank of capacitors for power factor correction. this will reduce the peak electrical demand charges by an average of 93 kw every month. the plant current pays $13 per kw in peak demand charges. the capacitor bank will include 223 kw of fixed capacitors, and 183 of variable capacitors. the fixed capacitors cost $59 per kw, and the variable capacitors will cost $65 per kw. the consultant charges 21% of the equipment costs to install the capacitors. because this project will reduce the demand for the electric utility, they are prepared to provide a one-time rebate of $42 per kw of reduced demand. what is the simple payback period for this project (in years)?