Question 17 (2 points) A beam of particles travels at a speed of (2.5x10^8) m/s. Scientists in the laboratory measure the average lifetime of the particles in the beam as (6.50x10^-6) s. Determine the average lifetime of the particles when they are at rest. Note: Your answer is assumed to be reduced to the highest power possible. Your Answer: x10 Answer units Add attachments to support your work Question 18 (2 points) A spaceship with a proper length of 150 m travels past an asteroid at a speed of 0.84c. Determine the length of the spaceship as measured from the asteroid. Your Answer: Answer units Add attachments to support your workQuestion 19 (4 points) 235 1 92 231Th + He Determine the energy released by this nuclear reaction in Joules given the following mass measurements mHe-4 = 4.00260u MTh-231 = 231.038060 my-235 = 235.04393u Recall that u = 1.66 x 10-27 kg Note: Your answer is assumed to be reduced to the highest power possible. Your Answer: x10 Answer units