hiệu điện thế giữa 2 đầu dây dẫn lá 10v thì có cường độ 1,25A .Nếu cường độ dòng điện là 0,75 A thì hiệu điện thế là bao nhiêu?

Arod of some material 0.20 m long elongates 0.20 mm on heating from 21 to 120°c. determine the value of the linear coefficient of thermal expansion [in (degrees c)^-1] for this material.

The experiment done in lab is repeated, using a ball that has unknown mass m. you plot your data in the form of f 2 versus m/l, with f in rev/s, m in kg, and l in m. your data falls close to a straight line that has slope 3.19 m/(kg · s2). use g = 9.80 m/s2 and calculate the mass m of the ball.

Convection occurs when thermal energy is transferred by the movement of