A block of mass m = 10 kg is attached through a rope to a uniform solid disk of radius R = 0.2 m and mass M = 5 kg free to rotate around an axle through its center of mass. The block is initially held by hand and then released. What is the tension in the rope as the mass m descends?

The star betelgeuse is about 600 light-years away. if it explodes tonight, a. we'll know because debris from the explosion will rain down on us from space. b. we'll know it immediately because it will be brighter than the full moon in the sky. c. we won't know about it until 600 years from now. d. none of the above.

It is really hard for me right know

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.