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Author Question: The mass of a star is 8.0 1030 kg, and the mass of a hydrogen atom is 1.67 1027 kg. If we assume ... (Read 93 times)

cmoore54

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on: Jul 28, 2018
The mass of a star is 8.0  1030 kg, and the mass of a hydrogen atom is 1.67  1027 kg. If we assume that the star is mostly composed of hydrogen, approximately how many atoms are there in the star?
 a. 1.3E+4 atoms
  b. 2.1E58 atoms
  c. 4.8E+57 atoms
  d. 8.0E+30 atoms

Question 2

When NASA was communicating with astronauts on the Moon, the time from sending on the Earth to receiving on the Moon was 1.28 s. Find the distance from Earth to the Moon. (The speed of radio waves is 3.00  108 m/s.)
 a. 240 000 km
  b. 384 000 km
  c. 480 000 km
  d. 768 000 km


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yahahah24021

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Reply #1 on: Jul 28, 2018
Answer to Question 1

c

Answer to Question 2

b


cmoore54

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Reply 2 on: Jul 28, 2018
Wow, this really help

daiying98

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Reply 3 on: Yesterday
Gracias!

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