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

Author Question: Which has a greater mass? A) four protons B) two neutrons and two protons in a helium nucleus ... (Read 172 times)

nummyann

  • Hero Member
  • *****
  • Posts: 576
Which has a greater mass?
 
  A) four protons
  B) two neutrons and two protons in a helium nucleus
  C) A and B both have exactly the same mass.

Question 2

Briefly describe two different ways of measuring the mass of a cluster of galaxies.
 
  What will be an ideal response?



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

morganmarie791

  • Sr. Member
  • ****
  • Posts: 336
Answer to Question 1

A

Answer to Question 2

There are three basic methods: The first method is to apply a form of the orbital velocity law to a group of galaxies. The second method relies on measuring the temperature of hot X-ray gas in the intracluster medium. Because the intracluster medium is nearly in a state of gravitational equilibrium, the average kinetic energies of the gas particles (which we find by measuring the temperature of the gas) are determined primarily by the strength of gravity and hence by the amount of mass within the cluster. The third method uses gravitational lensing to determine the mass of the cluster. The light-bending angle of a gravitational lens depends on the mass of the cluster, so we can measure the mass by observing how strongly the cluster distorts light paths of more distant galaxies. All three methods generally agree with one another.




nummyann

  • Member
  • Posts: 576
Reply 2 on: Jul 27, 2018
:D TYSM


JaynaD87

  • Member
  • Posts: 368
Reply 3 on: Yesterday
Wow, this really help

 

Did you know?

More than 30% of American adults, and about 12% of children utilize health care approaches that were developed outside of conventional medicine.

Did you know?

Though “Krazy Glue” or “Super Glue” has the ability to seal small wounds, it is not recommended for this purpose since it contains many substances that should not enter the body through the skin, and may be harmful.

Did you know?

Intradermal injections are somewhat difficult to correctly administer because the skin layers are so thin that it is easy to accidentally punch through to the deeper subcutaneous layer.

Did you know?

The FDA recognizes 118 routes of administration.

Did you know?

When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.

For a complete list of videos, visit our video library