1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Kaylis [27]
3 years ago
10

True or false: Black holes are invisible because they do not reflect light? A. true B. false

Physics
1 answer:
BaLLatris [955]3 years ago
3 0
True, because they have very strong gravitational field that even the light -the fastest thing known- can’t escape its power
You might be interested in
Draw a distance over time graph of a dog that is tied to a 4 foot rope and travels in 1 complete circle
Soloha48 [4]
I think this is the answer. I hope you can understand.

6 0
3 years ago
Each year, an average person in the United States is exposed to a radiation level of _____.
Anna11 [10]

Answer:

The correct answer is 0,2 rems

Explanation:

People are exposed to natural sources of radiation all the time. According to recent estimates, the average person in the United States receives an effective dose of approximately 3 mSv per year of natural radiation, which is equivalent to 0.3 rems. This amount includes cosmic radiation from outer space and is average because it varies depending on the region people are in.

The amount of radiation for a chest x-ray of an adult (0.01 rems) is approximately equal to 10 days of natural radiation to which we are all exposed every day.

Have a nice day!

3 0
3 years ago
Javier wants to improve his flexibility and increase his personal discipline. Which community resource should he select?
Dovator [93]
Karate class, kicking high and ducking fast makes you much more flexible and you must pay respects to those ou fight with and be intune with yourself to do it right, in other words karate is the answer.
7 0
3 years ago
If I turn on a light in a spaceship traveling 1C BACKWARDS, what happens to the photons? Speed -0-, or 1C in opposite direction?
Advocard [28]

If the spaceship's Physicist happens to be hanging out of one side
of the ship, and he measures the speed of the photons as they pass
him and leave the ship, he'll see them passing him at 'c' ... the speed
of light.

When those photons pass somebody who happens to be in their
path, and he decides to measure their speed, he'll see them move
past him at 'c' ... the speed of light.
 
It doesn't matter whether the observer who measures them is
moving, or at what speed.

And it doesn't matter what source the photons come from, or
whether the source is moving, or at what speed.

And it doesn't matter what the photons' wavelength/frequency is ...
anything from radio to gamma rays.

The photons pass everybody at 'c' ... the speed of light.

Yes, I hear you.  That can't be true. It's crazy.
Maybe it's crazy, but it's true.

5 0
3 years ago
An observer (O) spots a plane (P) taking off from a local airport and flying at a 29° angle horizontal to her line of sight and
nikklg [1K]
B. <span>10,824 feet
is the right answer
tan 26 = 6000/x
x = 10824 ft</span>
7 0
3 years ago
Other questions:
  • 1. A meteorologist describes a tropical storm as traveling northwest at 50 mi/h. Which attribute of the storm's motion has the m
    7·1 answer
  • Why has the atomic model changed over time
    10·1 answer
  • Molecules of two solid substances actually collide with each other to transfer energy in this method of heat transfer.
    11·2 answers
  • Your average speed on the first half of a car trip is 69.0 km/h. How fast do you have to drive on the second half of the trip to
    11·1 answer
  • Air that enters the pleural space during inspiration but is unable to exit during expiration creates a condition called a. open
    6·1 answer
  • Cu(s) + AgNO3(aq) → Cu(NO3)2(aq) + Ag(s) The unbalanced equation for the reduction of silver nitrate by copper is shown here. Wh
    12·1 answer
  • Which of the following best describes why understanding a watershed and its boundaries is important in designing housing develop
    5·1 answer
  • 3. A cart with mass of 30 kg is traveling with a velocity of 4.0 m/s. The
    11·2 answers
  • Sound, light, feelings and ideas are not
    10·1 answer
  • Please help meeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!