« previous next »

Author Question: To measure how Mercury spins, astronomers sent ________ to Mercury and used the Doppler shift to ... (Read 87 times)

DelorasTo

  • Hero Member
  • *****
  • Posts: 548
on: Jul 27, 2018
To measure how Mercury spins, astronomers sent ________ to Mercury and used the Doppler shift to determine how fast it was rotating.
 
  A) probes
  B) laser beams
  C) radar beams
  D) a satellite
  E) a single frequency radio signal

Question 2

The place in a planet's orbit that is closest to the Sun is called:
 
  A) vernal equinox.
  B) aphelion.
  C) perihelion.
  D) crossing the ecliptic.
  E) None of these; a planet's distance from the Sun never changes.


AISCAMPING

  • Sr. Member
  • ****
  • Posts: 347
Reply #1 on: Jul 27, 2018
Answer to Question 1

C

Answer to Question 2

C


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
« previous next »
 

Did you know?

All patients with hyperparathyroidism will develop osteoporosis. The parathyroid glands maintain blood calcium within the normal range. All patients with this disease will continue to lose calcium from their bones every day, and there is no way to prevent the development of osteoporosis as a result.

Did you know?

People who have myopia, or nearsightedness, are not able to see objects at a distance but only up close. It occurs when the cornea is either curved too steeply, the eye is too long, or both. This condition is progressive and worsens with time. More than 100 million people in the United States are nearsighted, but only 20% of those are born with the condition. Diet, eye exercise, drug therapy, and corrective lenses can all help manage nearsightedness.

Did you know?

Hip fractures are the most serious consequences of osteoporosis. The incidence of hip fractures increases with each decade among patients in their 60s to patients in their 90s for both women and men of all populations. Men and women older than 80 years of age show the highest incidence of hip fractures.

Did you know?

More than 20 million Americans cite use of marijuana within the past 30 days, according to the National Survey on Drug Use and Health (NSDUH). More than 8 million admit to using it almost every day.

Did you know?

Astigmatism is the most common vision problem. It may accompany nearsightedness or farsightedness. It is usually caused by an irregularly shaped cornea, but sometimes it is the result of an irregularly shaped lens. Either type can be corrected by eyeglasses, contact lenses, or refractive surgery.

Scale used to measure pupil size in millimeters. Scale used to measure pupil size in millimeters.
Mercury’s Craters and Plains Mercury’s Craters and Plains
Geology on Mercury Geology on Mercury
Types of Problems Used to Measure Intelligence Types of Problems Used to Measure Intelligence
A typical peak-and-hold fuel-injector waveform. Most fuel injectors that measure less than 6 ohms ... A typical peak-and-hold fuel-injector waveform. Most fuel injectors that measure less than 6 ohms ...
Measure between terminal 30 and 87a. Terminal 87a is the normally closed contact, and there should ... Measure between terminal 30 and 87a. Terminal 87a is the normally closed contact, and there should ...
Video: Properties of macromolecules (Explained with No Audio)

For a complete list of videos, visit our video library