Tác dụng lên một bánh xe bán kính R = 0,5m và có mômen quán tính I = 20kg. m2 , một lực

tiếp tuyến với vành bánh Ft = 100N. Tìm:
a. Gia tốc của bánh xe?
b. Vận tốc dài của một điểm trên vành bánh sau khi tác dụng lực 10 giây biết rằng lúc đầu bánh xe
đứng yên?

Which articulations allow for greatest range of motion?

Aturntable a is built into a stage for use in a theatrical production. it is observed during a rehearsal that a trunk b starts to slide on the turntable 10 s after the turntable begins to rotate. knowing that the trunk undergoes a constant tangential acceleration of 0.31 m/s2, determine the coefficient of static friction between the trunk and the turntable.

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.