A pulsar (a rotating neutron star) emits pulses at a frequency of ...

[james9437]

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

[Briannahope]

Answer to Question 1

A

Answer to Question 2

A

[james9437]

Both answers were spot on, thank you once again

[Briannahope]

Great! Please up vote