Author Question: If you start with one gram of pure 14C half-life 6000 years, the amount remaining after 36,000 years ... (Read 129 times)

renzo156 · **on:** Jul 29, 2018

If you start with one gram of pure 14C half-life 6000 years, the amount remaining after 36,000 years will be

A) 1/32 gram. B) 1/64 gram. C) 1/128 gram. D) 1/6 gram. E) None.

Question 2

In order to simulate apparent weightlessness for astronauts in training (when the astronauts do not push on a seat), they are flown in a vertical circle.

If the passengers are to experience weightlessness, how fast should an airplane be moving at the top of a vertical circle with a radius of 2.5 km? A) 79 m/s
B) 310 m/s
C) 260 m/s
D) 160 m/s
E) 510 m/s