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

Author Question: A spaceship visits Alpha Centauri and returns to Earth. Alpha Centauri is 4.5 light-years from Earth ... (Read 109 times)

awywial

  • Hero Member
  • *****
  • Posts: 577
on: Jul 27, 2018
A spaceship visits Alpha Centauri and returns to Earth. Alpha Centauri is 4.5 light-years from Earth (our second closest star).
 
  If the spaceship travels at one-half the speed of light for essentially all of its expedition, how long was the ship gone according to an observer on the spaceship?

Question 2

What is the minimum distance of two points on the moon that can be just resolved by the Keck 10. meter telescope in Hawaii (use a wavelength of 600. nm, lunar distance of 380. thousand Km):
 
  (a) if there were no atmosphere?
  (b) if the atmosphere limits resolution to 0.2 arc-sec?


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

meganlapinski

  • Sr. Member
  • ****
  • Posts: 333
Reply #1 on: Jul 27, 2018
Answer to Question 1

7.8 years

Answer to Question 2

(a) 28. meters
(b) 0.4 Km


awywial

  • Hero Member
  • *****
  • Posts: 577
Reply #2 on: Jul 27, 2018
Thanks


meganlapinski

  • Sr. Member
  • ****
  • Posts: 333
Reply #3 on: Jul 27, 2018
Welcome :)


« previous next »
 

Did you know?

Interferon was scarce and expensive until 1980, when the interferon gene was inserted into bacteria using recombinant DNA technology, allowing for mass cultivation and purification from bacterial cultures.

Did you know?

The human body produces and destroys 15 million blood cells every second.

Did you know?

Many people have small pouches in their colons that bulge outward through weak spots. Each pouch is called a diverticulum. About 10% of Americans older than age 40 years have diverticulosis, which, when the pouches become infected or inflamed, is called diverticulitis. The main cause of diverticular disease is a low-fiber diet.

Did you know?

There are major differences in the metabolism of morphine and the illegal drug heroin. Morphine mostly produces its CNS effects through m-receptors, and at k- and d-receptors. Heroin has a slight affinity for opiate receptors. Most of its actions are due to metabolism to active metabolites (6-acetylmorphine, morphine, and morphine-6-glucuronide).

Did you know?

You should not take more than 1,000 mg of vitamin E per day. Doses above this amount increase the risk of bleeding problems that can lead to a stroke.

Earth Earth
The inhibitory response of rods to light. When light bleaches rhodopsin molecules, the rods’ ... The inhibitory response of rods to light. When light bleaches rhodopsin molecules, the rods’ ...
Tardigrade wasn't correct, nor was Gastrotricha. What on earth is this asking me. Tardigrade wasn't correct, nor was Gastrotricha. What on earth is this asking me.
A monochromatic beam of light of wavelength 600 nm is incident normally on a diffraction ... A monochromatic beam of light of wavelength 600 nm is incident normally on a diffraction ...
A portfolio earned -13%, 18%, 5%, 24%, and -5% in five successive years. What was the ... A portfolio earned -13%, 18%, 5%, 24%, and -5% in five successive years. What was the ...
Earth’s Early Atmosphere Earth’s Early Atmosphere
Video: hGH, Thyroid hormones & Aldosterone

For a complete list of videos, visit our video library