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

Author Question: Our calendar has leap years because A) there is one more sidereal day in a year than solar days. ... (Read 167 times)

Bob-Dole

  • Hero Member
  • *****
  • Posts: 547
on: Jul 27, 2018
Our calendar has leap years because
 
  A) there is one more sidereal day in a year than solar days.
  B) a tropical year is slightly more than 365 days.
  C) there is a difference between a sidereal year and a tropical year.
  D) the perihelion of Earth's orbit is slowly advancing.

Question 2

The most active galactic nuclei are usually found at large distances from us; relatively few nearby galaxies have active galactic nuclei. What does this imply?
 
  A) Supermassive black holes existed only when the universe was young and no longer exist today.
  B) Active galactic nuclei tend to become less active as they age.
  C) Active galactic nuclei can form only at large distances from the Milky Way.
  D) The jets seen in many active galactic nuclei must cause them to move far away from us.


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

matt

  • Sr. Member
  • ****
  • Posts: 344
Reply #1 on: Jul 27, 2018
Answer to Question 1

B

Answer to Question 2

B


Bob-Dole

  • Member
  • Posts: 547
Reply 2 on: Jul 27, 2018
Thanks for the timely response, appreciate it

Liamb2179

  • Member
  • Posts: 365
Reply 3 on: Yesterday
YES! Correct, THANKS for helping me on my review

« previous next »
 

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?

Carbamazepine can interfere with the results of home pregnancy tests. If you are taking carbamazepine, do not try to test for pregnancy at home.

Did you know?

The use of salicylates dates back 2,500 years to Hippocrates’s recommendation of willow bark (from which a salicylate is derived) as an aid to the pains of childbirth. However, overdosage of salicylates can harm body fluids, electrolytes, the CNS, the GI tract, the ears, the lungs, the blood, the liver, and the kidneys and cause coma or death.

Did you know?

Dogs have been used in studies to detect various cancers in human subjects. They have been trained to sniff breath samples from humans that were collected by having them breathe into special tubes. These people included 55 lung cancer patients, 31 breast cancer patients, and 83 cancer-free patients. The dogs detected 54 of the 55 lung cancer patients as having cancer, detected 28 of the 31 breast cancer patients, and gave only three false-positive results (detecting cancer in people who didn't have it).

Did you know?

Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.

Current Positions of Known Dwarf Planets and SSSBs in the Outer Solar System Current Positions of Known Dwarf Planets and SSSBs in the Outer Solar System
Origin of a Solar Flare Origin of a Solar Flare
Chinese workers on a railway in the far West. “Without them,” Leland Stanford, president of the Cent Chinese workers on a railway in the far West. “Without them,” Leland Stanford, president of the Cent
Solar EM Radiation Penetration into Earth's Atmosphere Solar EM Radiation Penetration into Earth's Atmosphere
Checklist of Developmental Skills: Birth to 5 years Checklist of Developmental Skills: Birth to 5 years
Walking into new year kids drawing Walking into new year kids drawing
Video: ribosome

For a complete list of videos, visit our video library