Look at the picture and find six more mistakes in the description The Cameron Family
This is a picture of the Cameron family: Mr and Mrs Cameron are in the middle of the picture.
Mrs Cameron is quite cert and Mr Cameron is quite tall. They're both a bit thin. Mrs Cameron's got long
dark hair Mr Cameron's hair is short and dark. Mr Cameron's wearing a grey shirt and black trousers.
Mrs Camerons wearing a red dress.
Their children, Harry and Chloe, are standing next to them. Chloe's tall. She's taller than Mr Cameron and
Harry but she isn't as tall as Mrs Cameron Mrs Cameron is the tallest person in the family. Harry's shorter
than his father, but he isn't as tall as Chloe. Both Harry and Chloe are slim. Harry's got long fair hair. Chloe's
hair is long and dark. Harry's wearing a T-shirt and jeans. Chloe's wearing a white top and a green skirt.
N ≈ 1.57·10²³
Объяснение:
T = 315 K
<v> = 320 м/c
m = 20 г = 0,02 кг
Na = 6.022·10²³ 1/моль - постоянная Авогадро
R = 8.31 Дж/(моль·К) - универсальная газовая постоянная
N - ?
По закону Клапейрона-Менделеева
pV = νRT
(р - давление, V - объём, ν - количество вещества)
ν = N/Na
pV = NRT/Na (1)
Будем считать газ идеальным и одноатомным, тогда давление газа р можно вычислить как
р = nm₀<v>²/3 (n - концентрация, m₀ - масса молекулы)
n = N/V; m₀ = m/N
Тогда
nm₀ = m/V
р = m<v>²/3V
и
pV = m<v>²/3 (2)
Приравняем правые части уравнений (1) и (2)
NRT/Na = m<v>²/3
и выразим отсюда N
N = m<v>²Na/3RT
N = 0.02 · 320² · 6.022·10²³ : (3 · 8.31 · 315)
N ≈ 1.57·10²³
2h = v×t
И тогда h = v×t / 2
Подставим наши значения:
h = 700 м/с × 0,3 с / 2 = 105 м
ответ: глубина моря 105 метров.
P. S. вообще, справочник по физике говорит, что скорость звука в воде составляет не 700, а 1450-1480 м/с