I REALLY REALLY NEED HELP CAN SOMEONE HELP ME ANSWER ALL OF THE QUESTION PLZ

a sample of unknown material weighs 500 n in air and 200 n when immesersed in alcholol with a specfic gravity of 0.7 what is the

svet-max [94.6K]

Answer: The mass density is 1166.36 $kg/m^{3}$ .

Explanation:

Given: Weight of sample in air $(F_{air})$ = 500 N

Weight of sample in alcohol $(F_{alc})$ = 200 N

Specific gravity = 0.7 = $0.7 \times 1000 = 700 kg/m^{3}$

Formula used to calculate Buoyant force is as follows.

$F_{B} = F_{air} - F_{alc}\\= 500 - 200 \\= 300 N$

Hence, volume of the material is calculated as follows.

$V = \frac{F_{B}}{\rho \times g}$

where,

$F_{B}$ = Buoyant force

$\rho$ = specific gravity

g = acceleration due to gravity = 9.81

Substitute the values into above formula.

$V = \frac{F_{B}}{\rho \times g}\\= \frac{300}{700 \times 9.81}\\= \frac{300}{6867}\\= 0.0437 m^{3}$

Now, mass of the material is calculated as follows.

$mass = \frac{F_{air}}{g}\\= \frac{500 N}{9.81}\\= 50.97 kg$

Therefore, density of the material or mass density is as follows.

$Density = \frac{mass}{volume}\\= \frac{50.97 kg}{0.0437 m^{3}}\\= 1166.36 kg/m^{3}$

Thus, we can conclude that the mass density is 1166.36 $kg/m^{3}$ .

7 0

2 years ago

What is the mass number of Carbon–12, which has 6 protons and 6 neutrons?

vivado [14]

12.0107u is the mass number of carbon.

7 0

3 years ago

Include two kinds

MatroZZZ [7]

Answer:

Explanation:

Ionic bond:

It is the bond which is formed by the transfer of electron from one atom to the atom of another element.

Both bonded atoms have very large electronegativity difference. The atom with large electronegativity value accept the electron from other with smaller value of electronegativity.

For example:

Sodium chloride is ionic compound. The electronegativity of chlorine is 3.16 and for sodium is 0.93. There is large difference is present. That's why electron from sodium is transfer to the chlorine. Sodium becomes positive and chlorine becomes negative ion. Both atoms are joint together by electrostatic interaction and ionic compound sodium chloride is formed.

Covalent bond:

It is formed by the sharing of electron pair between bonded atoms.

The atom with larger electronegativity attract the electron pair more towards it self and becomes partial negative while the other atom becomes partial positive.

For example:

In water the electronegativity of oxygen is 3.44 and hydrogen is 2.2. That's why electron pair attracted more towards oxygen, thus oxygen becomes partial negative and hydrogen becomes partial positive and both bonded atoms connected together through covalent bond.

8 0

3 years ago

Please help me i need this asp (will me mark brainless)

Dvinal [7]

A balanced chemical reaction equation is one in which the number of atoms of each of the atoms are the same on both sides of the reaction equation.

<h3>Balanced reaction equation</h3>

A balanced reaction equation is a type of reaction equation in which the number of atoms of each reactant on both sides of the reaction equation are the same.

Let us now try to balance each reaction;

2H2 + O2 ----> 2H2O
S8 + 12O2 -------> 8SO3
2HgO ----> 2Hg + O2
Zn + 2HCl ------> ZnCl2 + H2

Hence a balanced chemical reaction equation is one in which the number of atoms of each of the atoms are the same on both sides of the reaction equation.

Learn more about balancing reaction equations: brainly.com/question/7358082

4 0

2 years ago

PHYSICAL SCIENCE HELP

nikitadnepr [17]

Answer:

the magnitude of gravitational force would be 20 N

Explanation:

therefore on a body of mass m by earth is $\frac{GMm}{r^{2}}$

where M is the mass of earth m is the mass of body, G is the gravitational constant and r is the distance of seperation from centre of earth.

therefore F = $m\times \frac{GM}{r^{2}}=mg=10m$

therefore F = 20 N.

7 0

3 years ago