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Author Question: A firecracker breaks up into two pieces, one of which has a mass of 200 g and flies off along the ... (Read 48 times)

yoroshambo

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on: Jul 29, 2018
A firecracker breaks up into two pieces, one of which has a mass of 200 g and flies off along the +x-axis with a speed of 82.0 m/s. The second piece 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 kg  m/s at 56.3 from the +x-axis
  B) 93.5 kg  m/s at 28.8 from the +x-axis
  C) 21.2 kg  m/s at 39.5 from the +x-axis
  D) 361 kg  m/s at 0.983 from the +x-axis
  E) 21.2 kg  m/s at 56.3 from the +x-axis

Question 2

An electron has a relativistic momentum of 1.1  10-21 kg  m/s. What percent of its total energy is its kinetic energy?
 
  (melectron = 9.11 10-31 kg, c = 3.0  108 m/s)


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cdmart10

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

C

Answer to Question 2

76


yoroshambo

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Reply 2 on: Jul 29, 2018
YES! Correct, THANKS for helping me on my review

okolip

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Reply 3 on: Yesterday
Thanks for the timely response, appreciate it

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