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Author Question: A pulsar (a rotating neutron star) emits pulses at a frequency of 0.40 kHz. The period of its ... (Read 65 times)

james9437

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A pulsar (a rotating neutron star) emits pulses at a frequency of 0.40 kHz. The period of its rotation is
 
  A) 2.5 ms.
  B) 2.5 s.
  C) 0.025 s.
  D) 0.25 s.
  E) 25 ms.

Question 2

A train traveling at 50. km/h approaches another train moving toward the first at 90. km/h. If they are 35. km apart (on a straight track) how long does it take before they meet?
 
  A) 15. min
  B) 55. min
  C) 30. min
  D) 45. min
  E) 25. min



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Briannahope

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Answer to Question 1

A

Answer to Question 2

A



james9437

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Both answers were spot on, thank you once again




 

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