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3 years ago

According to the Big Bang Theory, how long ago did the universe expand explosively into existence

2 answers:

5 0

According to some of the same evidence that is explained by the "Big Bang" theory, the universe expanded into existence roughly 13.7 billion years ago.

The Big Bang theory says nothing about the conditions at exactly the instant of the "beginning" or less than about 10⁻⁴³ second after it, and nothing about any "before".

In fact, it says that anything "before" is "unknowable", and in some sense, that 'Time' itself started with the 'big bang'.

Dmitry_Shevchenko [17]3 years ago

3 0

About 13.7 billion years ago

The Big Bang Theory states that the universe started about 13.7 billion years ago, and before that, everything was in 1 singularity.

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At what location in this diagram do the magnetic field lines show that the magnetic field is strongest ?

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4 years ago

Explain the difference between evaporation and boiling

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A 0.650 kg block is attached to a spring with spring constant 18.0 N/m . While the block is sitting at rest, a student hits it w

garik1379 [7]

Answer:

amplitude is 8.92 cm

speed of block is 44.11 cm/s

Explanation:

given data

mass = 0.650 kg

spring constant = 18 N/m

speed = 47 cm/s = 0.44 m/s

speed at x point = 0.350 A

to find out

amplitude of subsequent oscillation

solution

we know here conservation of energy

maximum kinetic energy = maximum potential energy

$\frac{1}{2} m v^{2} = \frac{1}{2} k A^{2}$

here we know k is spring constant and m is mass and A is amplitude and v is velocity

so solve it we get

A = $\sqrt{\frac{mv^{2} }{k} }$

put here all these value

A = $\sqrt{\frac{0.650(0.47)^{2} }{18} }$

A = 0.08931 m

so amplitude is 8.92 cm

and

by conservation of energy

initial energy = final energy

$\frac{1}{2} m V^{2} + \frac{1}{2} k x^{2}$ = $\frac{1}{2} m Vm^{2} + 0$

solve we gey V

V = $\sqrt{Vm^{2} - \frac{k }{m} x^{2} }$

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V = 0.4411 m/s

so speed of block is 44.11 cm/s

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Why is earth's surface not riddled with craters as is that of the moon?

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