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3 years ago

The symbol most often used to describe density is?

Physics

1 answer:

daser333 [38]3 years ago

7 0

Answer:

he density, or more precisely, the volumetric mass density, of a substance is its mass per unit volume. The symbol most often used for density is ρ

Explanation:

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Please answer me my question

creativ13 [48]

Answer:

1299 N/m²

Explanation:

Applying,

P = ρgh............... Equation 1

Where P = pressure of water at the bottom of the container, ρ = density of water, h = height of water in the container, g = acceleration due to gravity.

but,

V = πr²h............ Equation 2

Where V = volume of water, r = radius of the container

make h the subject of the equation

h = V/πr².................. Equation 3

From the question,

Given: V = 200 liters, = 200000 cm³, r = 70 cm

Constant: π = 22/7

Substitute these values into equation 3

h = 200000/[(22/7)(70²)]

h = 12.99 cm

h = 0.1299 m

Also given

Constant: g = 10 m/s², ρ = 1000 kg/m³

Substitute these values into equation 1

P = 0.1299(10)(1000)

p = 1299 N/m²

3 0

3 years ago

Given two vectors A--> = 4.20 i^+ 7.20 j^ and B--> = 5.70 i^− 2.40 j^ , find the scalar product of the two vectors A-->

Arisa [49]

Answer:

$\vec{A}\times \vec{B}=-51.12\hat{k}$

$\theta=83.2^{\circ}$

Explanation:

We are given that

$\vec{A}=4.2\hat{i}+7.2\hat{j}$

$\vec{B}=5.70\hat{i}-2.40\hat{j}$

We have to find the scalar product and the angle between these two vectors

$\vec{A}\times \vec{B}=\begin{vmatrix}i&j&k\\4.2&7.2&0\\5.7&-2.4&0\end{vmatrix}$

$\vec{A}\times \vec{B}=\hat{k}(-10.08-41.04)=-51.12\hatk}$ $\hat{k}$

Angle between two vectors is given by

$sin\theta=\frac{\mid a\times b\mid}{\mid a\mid \mi b\mid}$

Where $\theta$ in degrees

$\mid{\vec{A}}\mid=\sqrt{(4.2)^2+(7.2)^2}=8.3$

Using formula $\mid a\mid=\sqrt{x^2+y^2}$

Where x= Coefficient of unit vector i

y=Coefficient of unit vector j

$\mid{\vec{B}}\mid=\sqrt{5.7)^2+(-2.4)^2}=6.2$

$\mid{\vec{A}\times \vec{B}}\mid=\sqrt{(-51.12)^2}=51.12$

Using the formula

$sin\theta=\frac{51.12}{8.3\times 6.2}=0.993$

$\theta=sin^{-1}(0.993)=83.2$ degrees

Hence, the angle between given two vectors= $83.2^{\circ}$

7 0

4 years ago

What happens when a hydrogen atom acts like a nonmetal in a chemical reaction?

lord [1]

<span>It gains an electron.</span>

7 0

3 years ago

What is matter? Give a grade 10/11/12 understanding.

lara [203]

Matter can be many things, but is mostly made of atoms. Atoms are small things that cannot be seen directly, as lights either passes through it or alters it. However, we know that atoms are made of 3 parts, those being the proton, neutron, and electron.

Protons have a positive electromagnetic charge.

Neutrons have no charge.

Electrons have a negative charge equal to the protons positive charge.

Protons and neutrons make up what's called the nucleus, which is orbited by the electrons.

Protons and neutrons also share another thing in common, that being their composition.

Until relatively recently, we thought that these were the smallest particles in the universe, and indestructible. However, modern discoveries have revealed that they are actually made of quarks and gluons.

These are actually indestructible, being part of the group that is elementary particles.

3 0

4 years ago

A child and her mother are at the park the child walked around a rectangular park while her mom waits on the bench the child ret

Genrish500 [490]

The distance is just the perimeter of the rectangle:

P = 2(411) + 2(475)
P = 822 + 950
P = 1772m

6 0

3 years ago