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3 years ago

Why are stars and plantets spherical

Physics

1 answer:

belka [17]3 years ago

6 0

Answer:

When a forming planet is big enough, it starts to clear its path around the star it orbits. ... A planet's gravity pulls equally from all sides. Gravity pulls from the center to the edges like the spokes of a bicycle wheel. This makes the overall shape of a planet a sphere, which is a three-dimensional circle.

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Hydrogen gas is maintained at 3 bars and 1 bar on opposite sides of a plastic membrane which is .3 mm thick. The temperature is

DENIUS [597]

Answer:

$N_a=1.8*10^{-6}kg/sm^2$

Explanation:

From the question we are told that:

Thickness of plastic membrane $L_t=0.3mm$

The temperature of hydrogen $T_h=25 \textdegree C$

Diffusion coefficient of hydrogen in the plastic $25 \textdegree C \mu=9*10-8m2/s$

The solubility of hydrogen in the plastic membrane $\+x=1.5*10{-3} kmol/m3$

Generally the equation for molar conc is mathematically given by

$CA_1=x*bar$

3bars

$CA_1=1.5*10^{-3}*3$

$CA_1=4.5*10^{-3}kmol/m^3$

1bar

$CA_1=1.5*10^{-3}*1$

$CA_1=1.5*10^{-3}kmol/m^3$

Generally the equation for molar diffusion flux of Hydrogen N_a is mathematically given by

$N_a=\frac{D{AB}}{\L}(CA_1-CA_2)$

$N_a=\frac{9*10^{-8}}{0.3*10^-^3} (4.5*10^{-3}-1.5*10^{-3})kmoi/m^-3$

$N_a=9.*10^{-7}kmol/sm^2*2kh/kmole$

$N_a=1.8*10^{-6}kg/sm^2$

3 0

3 years ago

Determine the kinetic energy of a 575-kg roller coaster car that is moving with a speed of 16.0 m/s. __ J What is the kinetic en

worty [1.4K]

KE at 16m/s
==========
Givens
=====
m = 575 kg
v = 16 m/s

Formula
======
KE = 1/2 m* v^2

KE = 1/2 575 * 16^2
KE = 73600

Second Question
=============
m = 575
v = 32 m/s

KE = 1/2 mv^2
KE = 1/2 575 * 32^2
KE = 294400

Third Question
===========
Ke2 = KE1 * k where k is the number of times greater the second is than the first.
294400 = k * 73600
k = 294400 / 73600
k = 4 So the KE of the second condition is 4 times the first.

8 0

4 years ago

A small, solid cylinder with mass = 20 kg and radius = 0.10 m starts from rest and rotates without friction about a fixed axis t

Mice21 [21]

Answer:

Explanation:

angular acceleration α = 5 rad /s ²

θ = 1/2 α t² , θ is angle of rotation , t is time .

= .5 x 5 x 4²

= 40 rad .

θ = l / r , θ is angle formed , l is length unwound , r is radius o wheel .

l = θ x r

= 40 x .1

= 4 m .

4 0

3 years ago

Metamorphic rock occurs when you take any other type of rock and put them under ________ and ______________, and they twist and

GrogVix [38]

Answer:

This question appear incomplete

Explanation:

This question appear incomplete because of the absence of options. However, metamorphic rocks are rocks that are formed from other pre-existing rocks under heat and pressure (both are usually high), causing them to twist and melt together. Metamorphism simply means a change in form of something and that's what happens here also.

4 0

3 years ago

Ryan hypothesizes that darker colors heat up faster. he places a thermometer inside a red wool sock, a green cotton glove, and a

solmaris [256]

There's no "control" they all differ. If they were all exactly the same size shape and material it would be doable.

4 0

3 years ago

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