« previous next »

Author Question: The time a protostar takes to contract from a cool interstellar gas cloud to a main-sequence star ... (Read 71 times)

james0929

  • Hero Member
  • *****
  • Posts: 586
on: Jul 27, 2018
The time a protostar takes to contract from a cool interstellar gas cloud to a main-sequence star depends on its _____.
 
  A) volume
  B) luminosity
  C) mass
  D) temperature

Question 2

_____ say that certain things cannot be created out of nothing or vanish into nothing.
 
  A) Conservation laws
  B) Laws of kinematics
  C) Laws of planetary motion
  D) Illuminance laws


lolol

  • Sr. Member
  • ****
  • Posts: 330
Reply #1 on: Jul 27, 2018
Answer to Question 1

C

Answer to Question 2

A


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
« previous next »
 

Did you know?

The most dangerous mercury compound, dimethyl mercury, is so toxic that even a few microliters spilled on the skin can cause death. Mercury has been shown to accumulate in higher amounts in the following types of fish than other types: swordfish, shark, mackerel, tilefish, crab, and tuna.

Did you know?

Prostaglandins were first isolated from human semen in Sweden in the 1930s. They were so named because the researcher thought that they came from the prostate gland. In fact, prostaglandins exist and are synthesized in almost every cell of the body.

Did you know?

In 1864, the first barbiturate (barbituric acid) was synthesized.

Did you know?

There are over 65,000 known species of protozoa. About 10,000 species are parasitic.

Did you know?

As many as 20% of Americans have been infected by the fungus known as Histoplasmosis. While most people are asymptomatic or only have slight symptoms, infection can progress to a rapid and potentially fatal superinfection.

DNA replication is the basis for the perpetuation of life through time DNA replication is the basis for the perpetuation of life through time
Environmental Systems in Space and Time Environmental Systems in Space and Time
Golden toads in a Costa Rican Cloud Forest Golden toads in a Costa Rican Cloud Forest
Weak bones cause the spine to collapse over time Weak bones cause the spine to collapse over time
An insertion sequence (IS), shown in purple An insertion sequence (IS), shown in purple
Brittle Star Brittle Star
Video: Chemical Synapse Animation

For a complete list of videos, visit our video library