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Author Question: A radioactive sample has a half-life of 10 min. What fraction of the sample is left after 40 min? ... (Read 48 times)

JGIBBSON

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on: Jul 29, 2018
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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TheNamesImani

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Reply #1 on: Jul 29, 2018
Answer to Question 1

E

Answer to Question 2

C


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JGIBBSON

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Reply #2 on: Jul 29, 2018
Thanks


TheNamesImani

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Reply #3 on: Jul 29, 2018
Welcome :)


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