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3 years ago

If all distant galaxies are expanding away from us, does this mean we’re at the center of the universe?

Physics

1 answer:

yuradex [85]3 years ago

4 0

Answer:

Explanation:

Is a thing of relativity and perspective, let me put it this way: if you have lived all of your life in an island and you only see water around you, you will feel that you are in the middle of the sea, the farthest you can see is always the same distance and if you look at the same distance in all directions you will be at the center in the end.

Not all galaxies are expanding away, andromeda is in course to collide with the milky way. We are going to be in the same space that Andromeda some day! but no worries, it's really improbable that even a star from Andromeda crash with a star of the milky way, the distance among those stars is huge!

We are not in the center of the universe, we look in all directions of the universe and how we can see the same distance it might feel like we are in the center, but it's not necessary true.

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During a test a rocket travels upward at 90 m/s , and when it is 50 m from the ground its engine fails. Determine the maximum he

katrin [286]

Answer:

Maximum height above ground = 462.8m

Speed before hitting ground = 95.3m/s

Explanation:

Detailed explanation and calculation is shown in the image below

6 0

3 years ago

Read 2 more answers

The diagram below shows how sunlight is radiated back into the Earth's atmosphere as heat (infrared radiation).

Juliette [100K]

The diagram that shows how sunlight is radiated back into the Earth’s atmosphere as heat(infrared radiation) is of the Greenhouse effect.

The greenhouse effect is a natural phenomenon that occurs on Earth and heats up our atmosphere.

The name of this effect is derived from a greenhouse, which is used to grow crops in a special environment.

A greenhouse is basically a house that is made up of glass. The glass allows heat to enter the house but it does not allow the heat to escape to the outside thus keeping the greenhouse warm.

Some gases that are responsible for this effect are known as greenhouse gases. These gases are carbon dioxide, methane, chloro- fluoro carbons, etc.

These gases trap the heat of the sun and raise the temperature of Earth thus causing global warming.

Thus, the diagram that shows how sunlight is radiated back into the Earth’s atmosphere as heat(infrared radiation) is of the Greenhouse effect.

Read more about Greenhouse effect:

brainly.com/question/13390232

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6 0

1 year ago

PLS HELP what force is required to move your 1000 kg car an acceleration of 4 m/s

earnstyle [38]

What are the options?

i took physics last year and the first thing that came to mind was the forces that make a plane fly: drag, gravity, push, and lift.

3 0

3 years ago

AlexFokin [52]

Answer:

27J

3528J

Explanation:

First problem:

Given parameters:

Mass of tennis ball = 0.06kg

Velocity of tennis ball = 30m/s

Unknown:

Kinetic energy = ?

Solution:

Kinetic energy is the energy due to the motion of a body.

It is expressed as:

K.E = $\frac{1}{2}$ m v²

K.E = $\frac{1}{2}$ x 0.06 x 30² = 27J

Second problem:

Given parameters:

Mass = 30kg

Height = 12m

Unknown:

Potential energy = ?

Solution:

Potential energy is the energy due to the position of a body.

Mathematically;

Potential energy = mgh

m is the mass

g is the acceleration due to gravity

h is the height

Now;

Potential energy = 30 x 9.8 x 12 = 3528J

7 0

2 years ago

A car is traveling at 30 m/s in a straight line. The drive applies the brakes for 3 seconds and the car slows down to 12 m/s. Wh

jeyben [28]

Answer:

The answer to your question is: -6m/s²

Explanation:

Data

vo = 30 m/s

vf = 12 m/s

t = 3 s

a = ?

Formula

vf = vo + at

a = (vt - vo) / t

Process

a = (12 - 30) / 3 substitution

a = -18 / 3 simplify

a = -6 m/s² result, is negative because the car

is slowing down.

3 0

3 years ago