Cho mạch điện như hình, biết R1=7Ω, R2=12Ω, R3=4Ω, điện trở của các dây nối không đáng kể, hiệu điện thế giữa hai đầu đoạn mạch là 12V. Hãy tính: a/Điện trở tương đương của đoạn mạch
b/ Cường độ dòng điện qua mỗi điện trở

Aprojectile is launched horizontally 10m above the ground and with an initial velocity of 15 m/s. a) sketch the trajectory using an appropriate coordination system. b) how long for the projectile to reach the ground. c) how far did projectile travel horizontally before striking the ground. d) determine the projectilex & y position at t-1.3s e) determine the magnitude and direction of projectile velocity at t= 1.3s f) determine the magnitude and direction of projectile acceleration at t-1.3s

Write a full page that sumerizes thermodynamics it’s from the website visionlearnig

Acommercial refrigerator with refrigerant-134a as the working fluid is used to keep the refrigerated space at -35°c by rejecting waste heat to cooling water that enters the condenser at 18°c at a rate of 0.25 kg/s and leaves at 26°c. the refrigerant enters the condenser at 1.2 mpa and 50°c. if the compressor consumes 3.3 kw of power, determine (a) the mass flow rate of the refrigerant, (b) the refrigeration load, (c) the cop, and (d) the minimum power input to the compressor for the same refrigeration load.