« previous next »

Author Question: Which of these stars lies closest to the north celestial pole on the celestial sphere? A) Deneb ... (Read 72 times)

Tazate

  • Hero Member
  • *****
  • Posts: 532
on: Jul 27, 2018
Which of these stars lies closest to the north celestial pole on the celestial sphere?
 
  A) Deneb
  B) Alpha Centauri
  C) Spica
  D) Sirius

Question 2

Which of the following best explains why the Moon's orbital period and rotation period are the same?
 
  A) The Moon once rotated faster, but tidal friction slowed the rotation period until it matched the orbital period.
  B) The Moon was once closer to Earth, but the force of gravity got weaker as the Moon moved farther away.
  C) The law of conservation of angular momentum ensured that the Moon must have the same amount of rotational angular momentum as it has of orbital angular momentum.
  D) The equality of the Moon's orbital and rotation periods is an extraordinary astronomical coincidence.


IRincones

  • Sr. Member
  • ****
  • Posts: 321
Reply #1 on: Jul 27, 2018
Answer to Question 1

A

Answer to Question 2

A


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
« previous next »
 

Did you know?

The oldest recorded age was 122. Madame Jeanne Calment was born in France in 1875 and died in 1997. She was a vegetarian and loved olive oil, port wine, and chocolate.

Did you know?

Bisphosphonates were first developed in the nineteenth century. They were first investigated for use in disorders of bone metabolism in the 1960s. They are now used clinically for the treatment of osteoporosis, Paget's disease, bone metastasis, multiple myeloma, and other conditions that feature bone fragility.

Did you know?

Asthma attacks and symptoms usually get started by specific triggers (such as viruses, allergies, gases, and air particles). You should talk to your doctor about these triggers and find ways to avoid or get rid of them.

Did you know?

Anti-aging claims should not ever be believed. There is no supplement, medication, or any other substance that has been proven to slow or stop the aging process.

Did you know?

People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.

The Pleiades, an open cluster of stars in the constellation of Taurus. The Pleiades, an open cluster of stars in the constellation of Taurus.
The Spectra of Stars with Different Surface Temperatures. The Spectra of Stars with Different Surface Temperatures.
Classifying the Spectra of Stars Classifying the Spectra of Stars
A sphere represented by means of modeling. A sphere represented by means of modeling.
North America’s Untapped Fossil Fuels North America’s Untapped Fossil Fuels
A sphere, 0.30 m in radius, has a surface emissivity of 0.48 and is at a temp A sphere, 0.30 m in radius, has a surface emissivity of 0.48 and is at a temp
Video: Type of Transport - Active and Passive Processes

For a complete list of videos, visit our video library