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
Alekssandra [29.7K]
3 years ago
5

If a star is 13.7 light years away from earth, how can we tell which elements it is made of?

Physics
1 answer:
ICE Princess25 [194]3 years ago
8 0
Light year is a unit of measure of time that makes use of the speed of light and distance between objects to determine the number of years it will take for the light to travel. We can determine what element the object is made up of by the wavelength of the color. 
You might be interested in
The tendency to perceive a series of points or lines as having unity is the Gestalt rule of organization known as ________.
xxMikexx [17]
The best answer to fill in the blank should be ''continuation'' because series means a lot and lines are long, narrow, figures, so its continuation since its constant.
5 0
3 years ago
Read 2 more answers
In 8.5 s a fisherman winds 2.4 m of fishing line onto a reel whose radius is 3.0 cm (assumed to be constant as an approximation)
SSSSS [86.1K]

Answer:

9.412 rad/s.

Explanation:

Velocity is the rate of change of an object's position.

V = x/t

Where x is the distance in m

= 2.4 m

t is time taken in s

= 8.5 s

V = 2.4/8.5

= 0.2824 m/s.

Equating linear velocity and angular velocity,

V = ω*r

Where,

ω Is the angular speed in rad/s

r is the radius of the circle in m

= 3 cm

= 3cm * 1m/100 cm = 0.03 m

ω = V/r

= 0.2824/0.03

= 9.412 rad/s.

4 0
3 years ago
Which is an example of negative acceleration?
pshichka [43]

Answer:

A) a snowboarder who increases speed when traveling downhill

7 0
3 years ago
Read 2 more answers
When a snowball turns into a puddle of
In-s [12.5K]

When a snowball turns into a puddle of water, we know that (the snow ball gains energy and changes from a solid to liquid).

This is correct due to the fact that particles of the snowball are gaining speed and so it is heating up, when the solid's temperature reaches the melting point, it will become a liquid.

Therefore, D is the correct answer.

8 0
3 years ago
Water flows at speed v in a pipe of radius R. At what speed does the water flow through a constriction in which the radius of th
oksian1 [2.3K]

Answer:

   v₂ = 9 v

Explanation:

For this exercise in fluid mechanics, let's use the continuity equation

           v₁ A₁ = v₂ A₂

where v is the velocity of the fluid, A the area of ​​the pipe and the subscripts correspond to two places of interest.

The area of ​​a circle is

           A = π R²

let's use the subscript 1 for the starting point and the subscript 2 for the part with the constraint

     

In this case v₁ = v and the area is

            A₁ = π R²

in the second point

           A₂= π (R / 3)²

we substitute in the continuity equation

           v π R² = v₂ π R² / 9

            v = v₂ / 9

           

            v₂ = 9 v

6 0
3 years ago
Other questions:
  • All of the waves in the electromagnetic spectrum are _______ waves.
    14·2 answers
  • Two shuffleboard disks of equal mass, one orange and the other yellow, are involved in an elastic, glancing collision. The yello
    7·1 answer
  • Two circular coils are concentric and lie in the same plane. The inner coil contains 170 turns of wire, has a radius of 0.0095 m
    14·1 answer
  • Drill bits are attached to power drills to make holes. Drill bits are made of {BLANK 1} because they’re hard and resistant to co
    9·1 answer
  • What is the theoretical value for the speed of sound in a room at 24?
    14·1 answer
  • 3. Differentiate between:<br> Law of floatation and Archimedes' principle
    15·1 answer
  • How is a pareto chart different from a standard vertical bar​ graph?
    12·1 answer
  • A 1640 kg merry-go-round with a radius of 7.50 m accelerates from rest to a rate of 1.00 revolution per 8.00 s. Estimate the mer
    5·1 answer
  • Help help help HELP AAAAA
    14·1 answer
  • A brick falls to the ground. if the time for the collision of the brick and the ground is increased by a factor of 4, the force
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!