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3 years ago

Explain the differences between the geocentric theory of the universe and the heliocentric theory

Physics

1 answer:

Margarita [4]3 years ago

8 0

Geocentric Theory

In astronomy, the geocentric model is a superseded description of the Universe with Earth at the center. Under the geocentric model, the Sun, Moon, stars, and planets all orbited Earth

Heliocentric Theory

Heliocentrism is the astronomical model in which the Earth and planets revolve around the Sun at the center of the Solar System. Historically, heliocentrism was opposed to geocentrism, which placed the Earth at the center

G-Theory is the earth is the center of the universe.

H-Theory is the sun is the center of the universe.

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A steam power plant produces 50MW of net work while burning fuel to produce 150MW of heat energy at the high temperature. Determ

Mazyrski [523]

$Nth$ = $\frac{W net, out}{Qh}$

50MW is our net output.

Then, we plug it in.

= $\frac{50MW}{150MW}$ = 0.333 or 33.33%

W net, out = Qh - Ql

Ql = Qh - W net,out

Plug the values in.

Then, it becomes:

= 150MW - 50 MW

= 100MW

Thus, the cycle thermal efficiency is 33.33% and the heat rejected is 100MW.

3 0

3 years ago

3. Liquid nitrogen at 90 K, 400 kPa flows into a probe used in a cryogenic survey. In the return line the nitrogen is then at 16

devlian [24]

Answer:

Specific heat transfer = 236.16 kJ/kg

Ratio of return velocity to inlet velocity = 0.80

Explanation:

Given

Temperature of liquid nitrogen, T1 = 90 K

Pressure of liquid nitrogen, P1 = 400 kPa

Temperature of nitrogen, T2 = 160 K

Pressure of nitrogen, T2 = 400 kPa

A(e) = 100 A(i)

To solve, we use the formula

h(i)+ 1/2v(i)² + q = h(e) + 1/2v(e)² + q

The mass flow is

m = m(i) = m(e)

m = (Av/V)i = (Av/V)e

Ratio of return velocity to inlet velocity is

v(e) / v(i) = A(i)/A(e) * V(e)/V(i)

v(e) / v(i) = 1/100 * V(e)/V(i)

From the saturated Nitrogen table, at 100 K, we have

h(i) = h(f) = -73.2

v(i) = v(f) = 0.001452

From the saturated Nitrogen table again, at 160 K and 400 kPa

h(e) = 162.96 kJ/kg

v(e) = 0.11647 m³/kg

Substituting these in the formula, we have

v(e) / v(i) = 1/100 * 0.11647/0.001452

v(e) / v(i) = 1/100 * 80.2

v(e) / v(i) = 0.80

Energy equation is given by

q + h(i) = h(e)

q = h(e) - h(i)

Now, calculating specific heat transfer

q = 162.96 - -73.2

q = 236.16 kJ/kg

6 0

3 years ago

The start of the Space Age throughout the 1950s and 1960s helped Florida's economy flourish. How did it continue to impact Flori

Inessa05 [86]

Answer:

A) After the Space Age ended, many people moved to other states and the economy began to decline.

Explanation:

After the space age ended, businesses slumped, when the space shuttle program ended those made redundant could not be re absorbed due to a lack of follow-on by NASA. The 2008 recession also had impacted businesses in the area. As such many moved to other states, which had the effect of a brain drain.

After Apollo, in the late 70's, there was a similar decline of economic activities as workers were laid off and where finding it hard to sell off their properties as the real estate prices where low.

7 0

3 years ago

You are standing on a sheet of ice that covers the football stadium parking lot in Buffalo; there is negligible friction between

Murljashka [212]

Answer:

a) v = 0.0496 m / s , b) v = 0.0957 m / s

Explanation:

a) in this case we have an inelastic collision,

To solve these problems, the most important thing is to define the system formed by all the bodies, so that the forces during the crash have been internal and the amount of movement is conserved.

Therefore the system is made up of the ball and the player

initial instant. Before catching the ball

p₀ = m v₁

final moment. After you have grabbed the ball

$p_{f}$ = (m + M) v

the moment is preserved

po = p_{f}

m v₁ = (m + M) v

v = m / (m + M) v₁

let's calculate

v = 0.405 / (0.405 + 69) 8.50

v = 0.0496 m / s

in the same direction that the ball takes

b) In this case the ball bounces with a speed of V₂ = -7.80 m / s, the negative sign is because it is going in opposite directions

let's write the moment in two times

initial instant. Before the crash

p₀ = m v₁

try end. Right after the crash

p_{f} = m v₂ + M v

the moment is preserved

p₀ = p_{f}

m v₁ = m v₂ + M v

v = m (v₁ -v₂) / M

v = 0.405 /69 (8.50 - (7.80))

v = 0.0957 m / s

in the initial direction of the ball

8 0

3 years ago

PLEASE HELP

Nady [450]

Fe/Fr I think hope this helps

8 0

4 years ago

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