« previous next »

Author Question: Which of these stars lies closest to the north celestial pole on the celestial sphere? A) Deneb ... (Read 71 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?

More than nineteen million Americans carry the factor V gene that causes blood clots, pulmonary embolism, and heart disease.

Did you know?

The most common childhood diseases include croup, chickenpox, ear infections, flu, pneumonia, ringworm, respiratory syncytial virus, scabies, head lice, and asthma.

Did you know?

Patients who cannot swallow may receive nutrition via a parenteral route—usually, a catheter is inserted through the chest into a large vein going into the heart.

Did you know?

Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.

Did you know?

Vital signs (blood pressure, temperature, pulse rate, respiration rate) should be taken before any drug administration. Patients should be informed not to use tobacco or caffeine at least 30 minutes before their appointment.

Large-scale impacts of the (a) positive, and (b) negative phases of the North Atlantic Oscillation. Large-scale impacts of the (a) positive, and (b) negative phases of the North Atlantic Oscillation.
California sea lions are common prey for mammal-eating killer whales on the west coast of North Amer California sea lions are common prey for mammal-eating killer whales on the west coast of North Amer
The two bright stars are (left) Alpha Centauri and (right) Beta Centauri. The two bright stars are (left) Alpha Centauri and (right) Beta Centauri.
Rising and Setting of Stars at the Equator Rising and Setting of Stars at the Equator
North Pacific mT air North Pacific mT air
Distribution of zebra and quagga mussels in North America in 2014 Distribution of zebra and quagga mussels in North America in 2014
Video: Covalent bonds - role in the body

For a complete list of videos, visit our video library