This topic contains a solution. Click here to go to the answer
« previous next »

Author Question: A spaceship is headed toward Alpha Centauri at 0.999c. According to us, the distance to Alpha ... (Read 123 times)

nmorano1

  • Hero Member
  • *****
  • Posts: 598
on: Jul 27, 2018
A spaceship is headed toward Alpha Centauri at 0.999c. According to us, the distance to Alpha Centauri is about 4 light-years. How far away is Alpha Centauri according to the travelers in the ship?
 
  A) also about 4 light-years
  B) very slightly more than 4 light-years
  C) very slightly less than 4 light-years
  D) quite a bit less than 4 light-years
  E) quite a bit more than 4 light-years

Question 2

What is a galactic wind?
 
  A) a jet of ionized particles shot out of a starburst galaxy
  B) hot gas erupting into intergalactic space from a large superbubble
  C) the heat (infrared radiation) emitted by dust grains in the large molecular clouds of starburst galaxies
  D) the cooler gas pushed out of a starburst galaxy by the intense radiation pressure
  E) a wind created by the expansion of the universe that can move galaxies around


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

aloop

  • Sr. Member
  • ****
  • Posts: 315
Reply #1 on: Jul 27, 2018
Answer to Question 1

D

A spaceship is moving past us at a speed close to the speed of light.

Answer to Question 2

B


nmorano1

  • Hero Member
  • *****
  • Posts: 598
Reply #2 on: Jul 27, 2018
Both answers were spot on, thank you once again


aloop

  • Sr. Member
  • ****
  • Posts: 315
Reply #3 on: Jul 27, 2018
Great! Please up vote :D


« previous next »
 

Did you know?

For about 100 years, scientists thought that peptic ulcers were caused by stress, spicy food, and alcohol. Later, researchers added stomach acid to the list of causes and began treating ulcers with antacids. Now it is known that peptic ulcers are predominantly caused by Helicobacter pylori, a spiral-shaped bacterium that normally exist in the stomach.

Did you know?

The term bacteria was devised in the 19th century by German biologist Ferdinand Cohn. He based it on the Greek word "bakterion" meaning a small rod or staff. Cohn is considered to be the father of modern bacteriology.

Did you know?

Parkinson's disease is both chronic and progressive. This means that it persists over a long period of time and that its symptoms grow worse over time.

Did you know?

Amphetamine poisoning can cause intravascular coagulation, circulatory collapse, rhabdomyolysis, ischemic colitis, acute psychosis, hyperthermia, respiratory distress syndrome, and pericarditis.

Did you know?

Calcitonin is a naturally occurring hormone. In women who are at least 5 years beyond menopause, it slows bone loss and increases spinal bone density.

Local/long distance cell Signaling Local/long distance cell Signaling
Alpha Helix Alpha Helix
The Alpha-Z Alphabetic Color-Coding System The Alpha-Z Alphabetic Color-Coding System
The inverse-square law and its effects. Doubling your distance away from a radioactive material ... The inverse-square law and its effects. Doubling your distance away from a radioactive material ...
A spaceship leaves Earth at a steady forward speed of 70% the speed of light. How fast relative ... A spaceship leaves Earth at a steady forward speed of 70% the speed of light. How fast relative ...
The relationship between recombination frequency and physical distance between genes The relationship between recombination frequency and physical distance between genes
Video: Cardiac Cycle (Part 2 of 4)

For a complete list of videos, visit our video library