This topic contains a solution. Click here to go to the answer

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 92 times)

cmoore54

  • Hero Member
  • *****
  • Posts: 568
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



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

yahahah24021

  • Sr. Member
  • ****
  • Posts: 323
Answer to Question 1

c

Answer to Question 2

b




cmoore54

  • Member
  • Posts: 568
Reply 2 on: Jul 28, 2018
Thanks for the timely response, appreciate it


mjenn52

  • Member
  • Posts: 351
Reply 3 on: Yesterday
Great answer, keep it coming :)

 

Did you know?

For pediatric patients, intravenous fluids are the most commonly cited products involved in medication errors that are reported to the USP.

Did you know?

Always store hazardous household chemicals in their original containers out of reach of children. These include bleach, paint, strippers and products containing turpentine, garden chemicals, oven cleaners, fondue fuels, nail polish, and nail polish remover.

Did you know?

As of mid-2016, 18.2 million people were receiving advanced retroviral therapy (ART) worldwide. This represents between 43–50% of the 34–39.8 million people living with HIV.

Did you know?

The use of salicylates dates back 2,500 years to Hippocrates's recommendation of willow bark (from which a salicylate is derived) as an aid to the pains of childbirth. However, overdosage of salicylates can harm body fluids, electrolytes, the CNS, the GI tract, the ears, the lungs, the blood, the liver, and the kidneys and cause coma or death.

Did you know?

Dogs have been used in studies to detect various cancers in human subjects. They have been trained to sniff breath samples from humans that were collected by having them breathe into special tubes. These people included 55 lung cancer patients, 31 breast cancer patients, and 83 cancer-free patients. The dogs detected 54 of the 55 lung cancer patients as having cancer, detected 28 of the 31 breast cancer patients, and gave only three false-positive results (detecting cancer in people who didn't have it).

For a complete list of videos, visit our video library