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1 year ago

Question 8: Cosmology (8 points)

Physics

1 answer:

STatiana [176]1 year ago

6 0

Big bang happened about 13.7 billion years ago in our universe.

<h3>Describe the beginning of the universe according to the big bang theory?</h3>

According to the big bang theory, about 13.7 billion years ago, an explosive expansion began, expanding our universe outwards faster than the speed of light.

<h3>Describe the future of the universe according to the flat model?</h3>

According to the flat model, the universe is infinite and will continue to expand forever because the universe is expanding.

<h3>What is cosmic background radiation? </h3>

Cosmic background radiation is a weak radio-frequency radiation that is traveling through outer space in every direction. It is the residual radiation of the big bang, when the universe was very hot.

<h3>How do observations of the cosmic background radiation provide evidence to support the big bang theory? </h3>

The Big Bang theory predicts that the early universe was a very hot place and that as it expands, the gas within it cools. Thus the universe has all over radiation which is called the “cosmic microwave background".

Learn more about big bang here: brainly.com/question/10865002

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After a party the host pours the remnants of several bottles of wine into a jug. He then inserts a cork with a 2.25-cm diameter

bulgar [2K]

Answer:

F = 8066.67 N

Explanation:

The extra force exerted on the bottom of the jug can be expressed as the pressure generated by the cork multiplied by the area of the bottom. We can also obtain the Pressure P by dividing the force F1 applied to the cork by it's area A1.

Thus;

F = PA2 = (F1/A1) x (A2)

F = (F1/(πd1²/4)) x (πd2²/4)

π/4 will cancel out to give;

F = F1(d2/d1)²

F = 150(16.5/2.25)

F = 8066.67 N

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3 years ago

Using a series circuit, remove one battery from the circuit by re-wiring. How did it change the brightness of the bulbs? How doe

morpeh [17]

The higher the voltage in series, the brighter the bulb gets. so removing one battery from the circuit causes a reduction in the brightness of the bulb.
hope this helps

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3 years ago

You will get 50pts and the check mark.

Tamiku [17]

B) A ladybug crawling forward at constant rate of 2.5 m/s

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3 years ago

Read 2 more answers

To produce work a gas is expanded adiabatically from 3 MPa and 300oC to 80 kPa in a piston-cylinder device. Which of these two c

ANEK [815]

Answer:

Explanation:

Check attachment for solution

Given that, .

The initial gas pressure is

P1 = 3 MPa

The initial gas temperature

T1 = 300°C

The final gas pressure is

P2 = 80 KPa

Which are of two choices

1. Air with an isentropic expansion of 90% efficiency

2. Neon with an isentropic expansion of 80% efficiency

We want to know which will produce more work

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2 years ago

Suppose you are navigating a spacecraft far from other objects. The mass of the spacecraft is 2.0 104 kg (about 20 tons). The ro

elena-14-01-66 [18.8K]

Answer:

r = <2.640 10⁶, 1.01 10⁸, 0> m

Explanation:

For this exercise we are going to solve it for each direction separately,

we locate a fixed reference frame in space at the height of the rocket, such that the position of the rocket is

r₀ = <4, 4, 0> 10³ m

X axis

the initial velocity of the ship on this axis is v₀ₓ = 0, when it passes through the point x₀ = 4 km it ignites the rockets, experiencing a force of Fₓ = 7.0 10⁵ N for 21 s and the rockets turn off

They ask where it is after one hour t = 1 h = 3600 s

Let's apply Newton's second law

Fₓ = m aₓ

aₓ = Fₓ / m

aₓ = 7.0 10⁵/2 10⁴

aₓ = 3.5 10¹ m / s

Let's use kinematics to find the distance

for the first t₁ = 21 s the movement is accelerated

x₁ = x₀ + v₀ t₁ + ½ aₓ t₁²

x₁ = x₀ + ½ aₓ t₁²

x₁ = 4000 + ½ 35 21² = 4000 + 7717,.5

x₁ = 11717.5 m

this instant has a speed of

vₓ = v₀ₓ + aₓ t

vₓ = aₓ t ₁

vₓ = 35 21

vₓ = 735 m / s

the rest of the time there is no acceleration so it is uniform motion at this speed

t₂ = 3600 - 21

t₂ = 3576 s

vₓ = x₂ / t₂

x₂ = vₓ t₂

x₂ = 735 3576

x₂ = 2,628 10⁶ m

the total distance traveled in this direction is

x_total = x₁ + x₂

x_total = 11717.5 + 2.628 10⁶

x_total = 2,640 10⁶ m

Y axis

on this axis it is in the initial position of y₀ = 4000 m, with an initial velocity of $v_{oy}$ = 28 10³ m / s and there is no force on this axis F_{y} = 0

The movement in this axis is uniform,

v_{y} = y / t

y = v_{y} t

y = 28 10³/3600

y = 1.01 10⁸ m

the total distance is

y_total = y₀ + y

y_total = 4000 + 1.01 10⁸

y_total = 1.01 10⁸ m

Z axis

the initial position is z₀ = 0, with an initial velocity of v₀ = 0 and in this axis there is no force F_{z} = 0

the movement is uniform

z = 0

the final position of the rocket after 1 h is

r = <2.640 10⁶, 1.01 10⁸, 0> m

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3 years ago