All categories

2 years ago

Why are so many large optical telescopes located on mountaintops

Physics

2 answers:

postnew [5]2 years ago

8 0

Avoid cloud and man-made lights

Ivahew [28]2 years ago

3 0

Because light is degraded when it has to pass through air.

The best places for large telescopes would be on the Moon, in space,
or in orbit (like the Hubble, Kepler, and Webb space telescopes).

If you can't manage any of those places, or can't afford them, then
the next best choice for a location is any place where the light doesn't
need to plow through a lot of air to reach your telescope. Those places
are either on top of mountains or under giant helium balloons. Both of
these ideas have been used extensively for the past 100 years.

You might be interested in

If A bar + B bar = C bar and magnitude of A bar + magnitude of B bar = magnitude of C bar. Then the angle between A bar and B ba

dalvyx [7]

Answer:

D) 0°

Explanation:

If vectors A and B add up to vector C, then vector C must start where A starts and end where B ends.

Since we also know the magnitudes of A and B add up to the magnitude of C, then A, B, and C must be inline with each other.

Therefore, the angle between A and B is 0°.

5 0

2 years ago

An irregularly shaped rock is placed in 50 mL of water. The new reading in the container is now 74.2 mL. If the mass of the rock

cricket20 [7]

Taking into account the definition of density, the density of the rock is 3.6583 g/mL.

<h3>Definition of density</h3>

Density is defined as the property that matter has to compress into a given space.

In other words, density is a quantity that allows us to measure the amount of mass in a certain volume of a substance.

The expression for the calculation of density is:

density= mass÷ volume

From this expression it can be deduced that density is inversely proportional to volume: the smaller the volume occupied by a given mass, the higher the density.

<h3>Density of the rock</h3>

In this case, you know that:

Mass= 88.53 g
Volume of the rock= Volume after place the rock in the water - Volume of water= 74.2 mL - 50 mL= 24.2 mL

Replacing in the definition of density:

density of rock= 88.53 g÷ 24.2 mL

Solving:

<u><em>density of rock= 3.6583 g/mL</em></u>

In summary, the density of the rock is 3.6583 g/mL.

Learn more about density:

brainly.com/question/952755

brainly.com/question/1462554

#SPJ1

8 0

1 year ago

3.00 kg block moving 2.09 m/s right hits a 2.22 kg block moving 3.92 m/s left. afterwards, the 3.00 kg block moves 1.71 m/s left

Leviafan [203]

Momentum is conserved, so the total momentum before collision is equal to the total momentum after collision. Take the right direction to be positive. Then

(3.00 kg) (2.09 m/s) + (2.22 kg) (-3.92 m/s) = (3.00 kg) (-1.71 m/s) + (2.22 kg) <em>v</em>

where <em>v</em> is the velocity of the 2.22 kg block after collision. Solve for <em>v</em> :

6.27 kg•m/s - 8.70 kg•m/s = -5.13 kg•m/s + (2.22 kg) <em>v</em>

(2.22 kg) <em>v</em> = 2.70 kg•m/s

<em>v</em> = (2.70 kg•m/s) / (2.22 kg)

<em>v</em> ≈ 1.22 m/s

i.e. a velocity of about 1.22 m/s to the right.

7 0

2 years ago

What is the age of a sample if there are 6 grams of an element that have not decayed outof an original 24 grams and has a half-l

amid [387]

Answer:

d ) 16 years

Explanation:

If n be number of half years passed then

$[tex]\frac{m}{m_0} =\sqrt[n]{\frac{1}{2} }$ [/tex]

m is mass undecayed m₀ is original mass

Here m = 6 g

m₀ =24 g

Putting these values

$\frac{6}{24} =\sqrt[n]{\frac{1}{2} }$

n = 2 half lives

age = 2 x 8 = 16 years

= 16 years

8 0

2 years ago

A beaker of vegetable oil contains a beam of light that is aimed at a surface at an angle of 34 degrees as shown. If the index o

Over [174]

Answer:

Angle of reflection of light is 34 degree

Explanation:

As per law of reflection of light we know that

angle of incidence of light = angle of reflection of light

So here we know that

angle of incidence on the surface of oil is given as

$\theta_i = 34 degree$

so we know that

$\theta_i = \theta_r$

so here we can say that reflection angle of light will be same as angle of incidence

$\theta_r = 34 degree$

4 0

2 years ago