What term describes a guardrail system, a positioning system, and a personal fall arrest system?What term describes a guardrail system, a positioning system, and a personal fall arrest system?
Select the best option.

A method of fall protection

PPE

A training method

Trip prevention system

In the winter, in order to keep the classroom steadily at 68 f before 10 pm, heating with an average rate of 42,000 btu/hr is provided. assume the outdoor temperature maintains at 32°f, determine the electrical power (kw) required to (a) operate a reversible heat pump (b) operate a real heat pump with a cop (7) of 4.5 and (c) operate an electrical-resistance heater.