I need help this is confusing

Which simple machine is not part of this compound machine? a. lever b. pulley c. inclined plane d. wheel and axle

What are chlorofluorocarbons and what impact do they have on the atmosphere?

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.