Đặt vào 2 đầu R1 hiệu điện thế U1=60V thì I1=2,5A .Đặt vào 2 đầu R2 hiệu điện thế U2=U1 thì I2=7,5 A .So sánh R1 và R2

Consider an insulating crystal, made up of layers of atoms. what form would you expect the temperature dependence of the phonon heat capacity to approach at extremely low temperatures if the interlayer coupling is i)very strong (rigid coupling), and ii) very weak. explain.

Wind and moving water provide energy. question 1 options: chemical mechanical thermal none of the above

The drag force, fd, imposed by the surrounding air on a vehicle moving with velocity v is given by fd = cdaρv 2/2 where cd is a constant called the drag coefficient, a is the projected frontal area of the vehicle, and ρ is the air density. an automobile is moving at v = 80 kilometers per hour with cd = 0.28, a = 2.3 m2, and ρ = 1.2 kg/m3.