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3 years ago

I need help with 6a, 6b, and 6c !!

Physics

1 answer:

andrey2020 [161]3 years ago

8 0

Answer

help me too

Explanation:

have this same problem, please help

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Consider an insulated tank with a volume V = 2 L is separated into two equal-volume parts by a thin wall. On the left is an idea

steposvetlana [31]

Answer

given,

V = 2 L

the left is an ideal gas at P = 100 k Pa and T = 500 K

mass is constant

$m_1 = m_2$

$\dfrac{P_1V_1}{RT_1} = \dfrac{P_2V_2}{RT_2}$

Pressure is same because it's not changing due to process

$\dfrac{V}{500} = \dfrac{2 V}{T_2}$

$T_2 = 1000\ K$

$\Delta S_{univ} = \Delta S_{sys} + (\Delta S)_{surr}$

$\Delta S_{univ} =m(C_v ln (\dfrac{T_2}{T_1}))+ R ln (\dfrac{V_2}{V_1})$

$m = \dfrac{P_1V_1}{RT_1}$

$m = \dfrac{100 \times 10^3 \times 2 \times 10^{-3}}{287\times 500}$

m = 1.39 x 10⁻³ Kg

$\Delta S_{univ} =1.39\times 10^{-3}(0.718 ln\ 2+ 0.287 ln (2)$

$\Delta S_{univ} =0.968\times 10^{-3}\ kJ/K$

5 0

3 years ago

Hi please I need help with my mMATHEMATICS ASSIGNMENTS

alisha [4.7K]

Answer:

The answers are below

Explanation:

a)3:5

Multiply by 4

Answer =12:20

b) 11:35

Multiply by 6 on each side

Answer =66:210

2) 68% of 375=255

375-255=120

Answer is 120 people escaped malaria

3) 5*3=15

450/15=30

Answer=30

4) 1251/9=139

278:973

There are 278 girls in the school

5 0

3 years ago

Read 2 more answers

Why are there more fat, shaggy bison in Time 3 than in Time 1?

tatiyna

Answer:

I believe the answer is D.

Explanation:

It would have been helpful if there had been more information included with this problem, but it would make sense that the answer is D. If there is a winter between time 1 and 3, bison that are not well-suited to the weather, (skinny and smooth) will die off, and only the ones well-suited to winter weather will survive to produce offspring.

8 0

3 years ago

An arrow is shot at a 30 degree angle with the horizontal. it has a velocity of 49 m/s how high will the arrow go? what horizont

stepladder [879]

<h2>That arrow goes 30.59 m high, it travels 211.96 m horizontally and taken 4.99 seconds to land.</h2>

Explanation:

Consider the vertical motion of ball,

We have equation of motion v = u + at

Initial velocity, u = u sin θ

Final velocity, v = -u sin θ

Acceleration = -g

Substituting

v = u + at

-u sin θ = u sin θ - g t

$t=\frac{2usin\theta }{g}$

This is the time of flight.

Consider the vertical motion of ball till maximum height,

We have equation of motion v² = u² + 2as

Initial velocity, u = u sin θ

Acceleration, a = -g

Final velocity, v = 0 m/s

Substituting

v² = u² + 2as

0² = u²sin² θ + 2 x -g x H

$H=\frac{u^2sin^2\theta }{2g}$

This is the maximum height reached,

Consider the horizontal motion of ball,

Initial velocity, u = u cos θ

Acceleration, a =0 m/s²

Time, $t=\frac{usin\theta }{g}$

Substituting

s = ut + 0.5 at²

$s=ucos\theta \times \frac{2usin\theta }{g}+0.5\times 0\times (\frac{2usin\theta }{g})^2\\\\s=\frac{2u^2sin\theta cos\theta}{g}\\\\s=\frac{u^2sin2\theta}{g}$

This is the range.

Here u = 49 m/s and θ = 30 degrees

Substituting

$t=\frac{2usin\theta }{g}=\frac{2\times 49\times sin30 }{9.81}=4.99s\\\\H=\frac{u^2sin^2\theta }{2g}=\frac{49^2\times sin^230 }{2\times 9.81}=30.59m\\\\R=\frac{u^2sin2\theta}{g}=\frac{49^2\times sin(2\times 30)}{9.81}=211.96m$

That arrow goes 30.59 m high, it travels 211.96 m horizontally and taken 4.99 seconds to land.

6 0

3 years ago

What factors might limit the maximum body size to which land vertebrates can grow?

Varvara68 [4.7K]

Gravity and maybe the fact that the atmospheric pressure above ground is lower than underwater

4 0

3 years ago