The half-life of iodine-131 is 10 days. What fraction will be left after 30 days if the original mass was 15g?

How is zig zagging a form of acceleration?

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.

Why do astronauts in the space shuttle weigh less?