« previous next »

Author Question: How does the escape speed from Mars compare with that of the Earth? MEarth=9.31 MMars; REarth=1.88 ... (Read 32 times)

dbose

  • Hero Member
  • *****
  • Posts: 597
on: Jul 27, 2018
How does the escape speed from Mars compare with that of the Earth?  MEarth=9.31 MMars; REarth=1.88  RMars
 
  A) 222.
  B) 22.5
  C) 44.9
  D) 66.2
  E) 20.2

Question 2

The 1420 MHz (21 cm) radio line generated by neutral hydrogen atoms is a good choice for interstellar communications because
 
  A) it is the easiest radio frequency to generate
  B) it is the only radio frequency that is not blocked by interstellar matter
  C) all intelligent civilizations should be aware of its universal significance and would probably also think of sending and receiving signals at this frequency
  D) it is the only frequency to which radio telescopes can be tuned


tdewitt

  • Sr. Member
  • ****
  • Posts: 318
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?

People about to have surgery must tell their health care providers about all supplements they take.

Did you know?

There are actually 60 minerals, 16 vitamins, 12 essential amino acids, and three essential fatty acids that your body needs every day.

Did you know?

Lower drug doses for elderly patients should be used first, with titrations of the dose as tolerated to prevent unwanted drug-related pharmacodynamic effects.

Did you know?

Atropine, along with scopolamine and hyoscyamine, is found in the Datura stramonium plant, which gives hallucinogenic effects and is also known as locoweed.

Did you know?

The Babylonians wrote numbers in a system that used 60 as the base value rather than the number 10. They did not have a symbol for "zero."

Humanmade pollutants may be driving the expansion of the Earth’s tropical belt seen Humanmade pollutants may be driving the expansion of the Earth’s tropical belt seen
Mira as seen from the Earth Mira as seen from the Earth
Martian geological features, such as the "Face on Mars", sometimes trigger facial pareidol Martian geological features, such as the "Face on Mars", sometimes trigger facial pareidol
The Interiors of Earth and Mercury The Interiors of Earth and Mercury
Evidence of Water on Mars Evidence of Water on Mars
The early development of the mammalian brain illustrated in schematic horizontal sections. Compare ... The early development of the mammalian brain illustrated in schematic horizontal sections. Compare ...
Video: ACTH/Cortisol (glycogenolysis, protein catabolism, lipolysis and gluconeogenesis)

For a complete list of videos, visit our video library