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a_sh-v [17]
3 years ago
10

Describe three pieces of evidence that support the Big Bang theory

Physics
2 answers:
Lina20 [59]3 years ago
7 0

Answer:

Sample Response: The big bang theory is supported by the observation that the spectrum of nearly all galaxies is red-shifted, implying that the universe is still expanding. It is also supported by the discovery of the cosmic microwave background radiation, which is leftover radiation from the big bang. Finally, the big bang theory is supported by the discovery that the composition of stars is 99% hydrogen and helium, the only two elements that could have existed shortly after the big bang.

Explanation:

edge

lisov135 [29]3 years ago
6 0

Explanation :

According to astronomers, the whole universe is started with a giant explosion called as Big Bang. Big Bang theory shows that the universe is  extended from high density state.

There are some evidence for big bang as :

(1) There are some red shifts of different galaxies which means that the universe is expanding.  

(2) Due to the expanding of universe, some of the new elements are created like hydrogen, deuterium etc.

(3) Microwaves are detected by orbiting detectors.

All this parameters shows that big bang theory was correct.

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Which of the following temperature readings is the coldest?
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Answer: K

Explanation:

From the temperature readings given, we should note that 0°F is thesame as 32°C. Therefore, 0°C is colder than 0°F.

We should note that at 0K which is written as K, it is the coolest and it is often called the absolute zero because at this degree, there can't be anything that's colder.

Therefore, the answer is K

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Because the silt (dirt particles) in muddy water eventually settles out, the muddy water is a ______________ .
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3 years ago
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Table 1 contains data about two completely ionised samples of pure boron.
WITCHER [35]

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2 years ago
To meet a U.S. Postal Service requirement, employees' footwear must have a coefficient of static friction of 0.5 or more on a sp
Vlada [557]

Answer:

the minimum time interval is 0.77 seconds

Explanation:

given data

coefficient of static friction = 0.5

coefficient of static friction shoes= 0.825

travel s = 2.40 m

to find out

what is the minimum time interval

solution

we know newton 2nd law

force = mass × acceleration

and

force acting on person due to friction

force = coefficient of static friction shoes × mg

so we can say

coefficient of static friction shoes × mg = ma

so

a = coefficient of static friction shoes × g

and we know g is 9.8 m/s²

so

distance formula by kinematic relation

distance = ut + 0.5 × at²

here put a value and u is zero because initial speed

2.40 = 0 + 0.5  × coefficient of static friction shoes × g× t²

2.40 = 0.5  × 0.825 × 9.8 × t²

t = 0.77 s

the minimum time interval is 0.77 seconds

5 0
3 years ago
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