Two freight cars each with a mass of 2.9 x 105 kg collide, Ask an Expert

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Q1. If a sample of Na18F has an approximately constant activity of 1081 decays/sec over a time interval of 2 minute, and all of the emitted radiation energy is absorbed by 5.00 kg of body tissue, what is the dose equivalent?

Q2. Two freight cars, each with a mass of 2.9 x 10^5 kg, collide and stick together. One was initially moving at 2.80 m/s and the other was at rest. What is the final speed?

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