Er 28,650 years? 3. How much of a 50 gram sample of Hydrogen-3 is left after 73.8 years?
The half-life is 12.3 years.
4. The half-life of plutonium-236 is 2.85 years. If 10 grams are left after
17.1 years, how many grams were in the original sample?
5. The half-life of lead-212 is 10.6 days. If 100 g are left after 53 days,
how many grams were in the original sample.

Atennis player used a tennis racket to hit a tennis ball with a mass of 0.25 kg with a force of 5.25 newtons. how does the force the tennis racket exerted on the tennis ball compare with the force the tennis ball exerted on the tennis racket? a. the force of the tennis racket on the tennis ball is equal in magnitude and opposite in direction to the force the tennis ball exerted on the tennis racket. b. the force of the tennis racket on the tennis ball is equal in magnitude and in the same direction as the force the tennis ball exerted on the tennis racket. c. the force of the tennis racket on the tennis ball is less in magnitude and in the same direction as the force the tennis ball exerted on the tennis racket. d. the force of the tennis racket on the tennis ball is greater in magnitude and opposite in direction as the force the tennis ball exerted on the tennis racket.