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

Author Question: A star is moving towards the earth with a speed at 90 the speed of light. It emits light, which ... (Read 207 times)

V@ndy87

  • Hero Member
  • *****
  • Posts: 571
on: Jul 29, 2018
A star is moving towards the earth with a speed at 90 the speed of light. It emits light, which moves away from the star at the speed of light. Relative to us on earth, what is the speed of the light moving toward us from the star?
 
  A) 0.90c
  B) c
  C) 1.1c
  D) 1.20c
  E) 1.9c

Question 2

A nuclear fission power plant has an actual efficiency of 39. If 0.25 MW of power are produced by the nuclear fission, how much electric power does the power plant output?
 
  A) 0.098 MW
  B) 9.8 MW
  C) 35 MW
  D) 0.35 MW


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

katheyjon

  • Sr. Member
  • ****
  • Posts: 331
Reply #1 on: Jul 29, 2018
Answer to Question 1

B

Answer to Question 2

A


V@ndy87

  • Member
  • Posts: 571
Reply 2 on: Jul 29, 2018
Thanks for the timely response, appreciate it

lcapri7

  • Member
  • Posts: 350
Reply 3 on: Yesterday
Wow, this really help

« previous next »
 

Did you know?

Vaccines prevent between 2.5 and 4 million deaths every year.

Did you know?

Before a vaccine is licensed in the USA, the Food and Drug Administration (FDA) reviews it for safety and effectiveness. The CDC then reviews all studies again, as well as the American Academy of Pediatrics and the American Academy of Family Physicians. Every lot of vaccine is tested before administration to the public, and the FDA regularly inspects vaccine manufacturers' facilities.

Did you know?

The shortest mature adult human of whom there is independent evidence was Gul Mohammed in India. In 1990, he was measured in New Delhi and stood 22.5 inches tall.

Did you know?

In Eastern Europe and Russia, interferon is administered intranasally in varied doses for the common cold and influenza. It is claimed that this treatment can lower the risk of infection by as much as 60–70%.

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.

An overview of the two stages of photosynthesis: light reactions and the Calvin cycle An overview of the two stages of photosynthesis: light reactions and the Calvin cycle
The same star field photographed with (a) a ground-based telescope, which is subject to poor seeing The same star field photographed with (a) a ground-based telescope, which is subject to poor seeing
Using a black light to spot leaks after adding dye to the oil. Using a black light to spot leaks after adding dye to the oil.
Obliquity "Tilt of Earth on its axis" Obliquity "Tilt of Earth on its axis"
Earth Atmosphere Earth Atmosphere
Sunflower Sea Star, California. Sunflower Sea Star, California.
Video: Four Giant Convection Cells oF Earth

For a complete list of videos, visit our video library