Không khí ẩm ở trạng thái ban đầu có t1 = 300C, 1 = 85% được thổi qua dàn lạnh có năng suất lạnh 6,3 kW thì đạt đến trạng thái 2 có t2 = tđs1 - 6 0C và 2 = 100%. Sau khi ra khỏi dàn lạnh không khí được tiếp tục gia nhiệt và đạt đến trạng thái 3 có 3 = 35%.

When someone slams her books on a table the kinect energy is transferred into vibrations that travel to your ears as sound waves which statement describes the movement of those waves

Asheet of steel 1.5 mm thick has nitrogen atmospheres on both sides at 1200oc and is permitted to achieve a steady-state diffusion condition. the diffusion coefficient for nitrogen in steel at this temperature is 6 x 10- 11 m2 /s, and the diffusion flux is found to be 1.2 x 10-7 kg/m2 -s. also, it is known that the concentration of nitrogen in the steel at the high-pressure surface is 4 kg/m3 . how far into the sheet from this high-pressure side will the concentration be 2.0 kg/m3 ? assume a linear concentration profile.

What was the first instrument to ever record an earthquake?