6. A wheel of diameter 30cm starts from rest and rotates with a constant angular acceleration of Srad/s^2. At the instant the wheel has computed its second revolution, compute the radial acceleration of a point on the rim in two ways: (a) using the relationship a = w*2r and (b) from the relationship a = v*2/r 7. A machinist is using a wrench to loosen a nut. The wrench is 20cm long, and he exerts a 18N force at the end of the handle at 37" with the handle. (a) What torque does the machinist exert about the center of the nut? (b) What is the maximum torque he could exert with this force, and how should the force be oriented? 8. A metal wire 80cm long and 0.150 cm in diameter stretches 0.4cm when a load of 10kg is hung on its end. Find the stress, the strain, and the Young's modulus for the material of the wire. 9. Find the pressure due to the fluid at a depth of 76 cm in still (a) water (pw = 1.00 g/cm*3) and (b) mercury (p = 13.6 g/cm*3). 10. Find the density of methane (M = 16 kg/kmol) at 20 "C and Satm. R = 83141/kmolk