A circuit consist of three resistors 10,18,and 36 respectively connected in parallel and combination is connected in series with the fourth resistance, The whole network is then supplied by 60V D. C supply if the power dissipated in the 10 resistance is 36kW determine the value of the fourth resistance and the total energy consumed from the supply after a period of 80 minutes

Apiping systems consists of 6 m of 6-std type k and 12 m of 4-std type k, both drawn copper tubing. the system conveys ethylene glycol at a rate of 0.013 m3/s. the pressure drop across the system is to be calculated. there are two 90° elbows in the 6-in pipe, a reduction from the 6-in pipe to the 4-in pipe and four 90° elbows in the 4-in pipe. all fittings are soldered (same as flanged) and regular. the inlet and outlet of the system are at the same height.