Staring from rest, an Apache helicopter’s rotors undergo an angular acceleration of 0.75 rad/s2. a. How fast will they be traveling in 60 seconds?
b. How many radians have they rotated through?
c. What is the linear velocity of the tip of the rotors (R = 7.3 m)?

In a load, the load is paralel to the shaft. n a. angular n b. thrust n c radial n d. none of the above

Blank liquids and gases exert a buoyant force on objects placed in them

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.