An isolated equipment grounding receptacle is installed using a rigid nonmetallic conduit and a metal device box. two 12 awg conductors enter the box and are spliced to two 12 awg conductors leaving the box and to two pigtails, which feed the receptacle. the 12 awg isolated equipment ground has a pigtail splice for the receptacle and continues through the box. a bare 12 awg equipment grounding conductor enters the box, connects to the box grounding screw, and continues on through the box. determine the minimum size metal device box for this installation.

Next a skier is pulled by a tow rope up a frictionless ski slope that makes an angle of 15 with the horizontal. the rope moves parallel to the slope with a constant speed of 0.69 m/s. the force of the rope does 800 3 of work on the skier as the skier moves a distance of 8.4 m up the incline. (a) if the rope moved with a constant speed of 2.2 m/s how much work would the force of the rope do on the skier as the skler moved a distance of 8.4 m up the incline? at what rate is the force of the rope doing work on the skier when the rope moves with a speed of (b) 0.69 m/s and (c) 2.2 m/s?