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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 60 times)

james9437

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on: Jul 27, 2018
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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Reply #1 on: Jul 27, 2018
Answer to Question 1

A

Answer to Question 2

A


james9437

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Reply #2 on: Jul 27, 2018
Both answers were spot on, thank you once again


Briannahope

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Reply #3 on: Jul 27, 2018
Great! Please up vote :D


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