Arnold lifts a set of weights during his workout and has a power of 9150 W. If he does 8030 J of work during his lift, how much time did it take for Arnold to lift his weights

The bar of prob. 5/82 is repeated here. the ends of the 0.4-m bar remain in contact with their re- spective support surfaces. end b has a velocity of 0.5 m/s and an acceleration of 0.3 m/s2 in the di- rections shown. determine the angular accelera- tion of the bar and the acceleration of end a.