A radioactive sample has a half-life of 10 min. What fraction of the sample is left after 40 min?
A) 1/32 B) 1/8 C) 1/2 D) 1/4 E) 1/16
Question 2
A firecracker breaks up into two pieces, one has a mass of 200 g and flies off along the x-axis with a speed of 82.0 m/s and the second has a mass of 300 g and flies off along the y-axis with a speed of 45.0 m/s.
What is the total momentum of the two pieces? A)
361 kgm/s at 56.3 from the x-axis
B)
93.5 kgm/s at 28.8 from the x-axis
C)
21.2 kgm/s at 39.5 from the x-axis
D)
361 kgm/s at 0.983 from the x-axis
E)
21.2 kgm/s at 56.3 from the x-axis
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