5. Cho đoạn mạch AB gồm 2 điện trở R = 120 và R = 162 mắc nối tiếp như sơ đồ mạch điện . Số chỉ vôn kế là 48V . Tính : a ) Só chi Ampe ke . b ) .Hiệu điện thế giữa 2 đầu điện trở R1 và giữa 2 đầu đoạn mạch AB

Natural forces that can alter ecosystems include seasons and climate changes. t or f

4r-134a enters the condenser of a residential heat pump at 800 kpa and 50°c at a rate of 0.022 kg/s and leaves at 750 kpa subcooled by 3°c. the refrigerant enters the compressor at 200 kpa superheated by 4°c determine (a) the isentropic efficiency of the compressor, (b) the rate of heat supplied to the heated room, and (c) the cop of the heat pump. also, determine (d) the cop and rate of heat supplied to the heated room if this heat pump operated on the ideal vapor-compression cycle between the pressure limits of 200 and 800 kpa. (0.757, 4.37 kw, 5.12, 6.18, 3.91 kw)

Asmall 12.00g plastic ball is suspended by a string in a uniform, horizontal electric field with a magnitude of 10^3 n/c. if the ball is in equilibrium when the string makes a 30 ° angle with the vertical, what is the net charge on the ball?