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 66 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?

After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.

Did you know?

The average older adult in the United States takes five prescription drugs per day. Half of these drugs contain a sedative. Alcohol should therefore be avoided by most senior citizens because of the dangerous interactions between alcohol and sedatives.

Did you know?

It is believed that the Incas used anesthesia. Evidence supports the theory that shamans chewed cocoa leaves and drilled holes into the heads of patients (letting evil spirits escape), spitting into the wounds they made. The mixture of cocaine, saliva, and resin numbed the site enough to allow hours of drilling.

Did you know?

Drug abusers experience the following scenario: The pleasure given by their drug (or drugs) of choice is so strong that it is difficult to eradicate even after years of staying away from the substances involved. Certain triggers may cause a drug abuser to relapse. Research shows that long-term drug abuse results in significant changes in brain function that persist long after an individual stops using drugs. It is most important to realize that the same is true of not just illegal substances but alcohol and tobacco as well.

Did you know?

The eye muscles are the most active muscles in the whole body. The external muscles that move the eyes are the strongest muscles in the human body for the job they have to do. They are 100 times more powerful than they need to be.

Spinnbarkeit is the ability of cervical mucus to stretch a distance before breaking. Spinnbarkeit is the ability of cervical mucus to stretch a distance before breaking.
Midpoint and Distance forumla Midpoint and Distance forumla
Signal transduction pathway initiated by trimeric TNF-alpha Signal transduction pathway initiated by trimeric TNF-alpha
Starch iodine test for alpha amylase. Starch iodine test for alpha amylase.
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 ...
Physical distance versus recombination distance on human male and female chromosome 19 Physical distance versus recombination distance on human male and female chromosome 19
Video: Bone processes - resorption and deposition, remodeling and response to stress in adult bones

For a complete list of videos, visit our video library