hello :) how to do this?

Answer:

I'm sorry but there is not enough context to answer your question.

Explanation:

Answer:

Answer below!

Explanation:

A fire can be extinguished by many forms like fire extinguisher, but the main is water. Water can extinguish fire.

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Answer:

The preferred method for extinguishing class “A” fires is to remove the heat. Water is the most common agent, but others such as dry chemical, halon, halogenated agents and foam can be used effectively. A class “B” fire involves flammable liquid or gas.

Explanation:

Answer:

9.28ml

Explanation:

The density of Lead (Pb) can be calculated using the formula:

Density (g/ml) = Mass (g) / Volume (ml)

According to the question, the empty beaker weighs 245.61 g, then weighed 350.52 g when lead was added to it. This means that the mass of lead in the breaker is: 350.52 g - 245.61 g = 104.91 g

Hence, mass of lead= 104.91g, density of lead= 11.3g/ml

Volume = mass / density

Volume = 104.91/11.3

Volume= 9.284

Hence, the volume of lead is 9.28ml

Answer:

The long form of the periodic table divides the elements into four major blocks known as s, p, d, and f.

The period to which a given element belongs can easily be determined from its electron configuration. Based on electron configurations, the periodic table can be divided into blocks denoting which sublevel is in the process of being filled.

Hope it helps.

Answer:

$182 is the value of the gold in the coin

Explanation:

Diameter is 2r, the ratio of the coin is = 1.62cm / 2 = 0.81cm

Following the formula of the volume of the coin:

V = π r² h

V = π*(0.81cm)²*0.085cm

V = 0.172cm³ = mL

As the density of the gold is 19.32g/mL, the mass of 0.1752mL of gold is:

0.1752mL * (19.32g / mL) =

3.385g is the mass of the coin

As the price of the gold is $53.90 / g, the value of the gold in the coin is:

3.385g * ($53.90 / g) =

Answer:

Explanation:

If the particle has a velocity of 4 m/s initially (at t=0) and has a constant acceleration of 2 m/s2, find the velocity of the particle: when t=1; when t=2; after t seconds.

The average acceleration of the car starting with a starting velocity of 0 meters/second and accelerating up to 9 meters/second in 3 seconds would be 3 meters/second².

There are three equations of motion given by  Newton

The first equation is given as follows

v = u + at

the second equation is given as follows

S = ut + 1/2×a×t²

the third equation is given as follows

v² - u² = 2×a×s

As given in the problem we have to find the average acceleration of the car starting with a starting velocity of 0 meters/second and accelerating up to 9 meters/second in 3 seconds,

By using the first equation of motion

v = u + at

By substituting the value of velocities and time period in the first equation of motion,

9 = 0 + 3a

3a = 9

a = 9/3

a = 3 meters/second²

Thus, the acceleration of the car would be 3 meters/second².

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Answer:

C. Theories have been confirmed through tests; hypotheses haven't.

Explanation:

In simple terms, a theory is something that has been studied, tested, and validated with results whereas a hypothesis is when one "guesses" or "assumes" about something with no prior tests. In short, a hypothesis can be best understood as just a proposal while theory can be taken as a validated result.

Through various trials and tests, a theory arrives whereas a hypothesis can be the initial stage of the testing. For example, in saying that "My hypothesis is that this metal cannot bend" is just assuming or expressing one's opinion. But when the metal is tested and a definite result is found, then that becomes a theory.

So, we can say that a theory is a confirmed result after tests while a hypothesis is not tested or confirmed with a definite result.  

Thus, the correct answer is option C.

Answer:

Explanation:

Density of a substance can be found by using the formula

[tex]Density = \frac{mass}{volume} [/tex]

From the question

mass = 32g

To find the density we must first find the volume of the block

From the question the block is a cuboid

Volume of cuboid = length × width × height

length = 8 cm

width = 4 cm

height = 2 cm

Volume of block = 8 × 4 × 2 = 64 cm³

Substitute the values into the above formula and solve for the density

That's....

[tex]Density = \frac{32}{64} \\ = \frac{1}{2} [/tex]

We have the final answer as

Density = 0.5 g/cm³

The block will float because it's density is less than the density of water which is

1 g/cm³

Hope this helps you

Answer:

d= 0.5 g/ cm³

The block will float in water.

Explanation:

The density of an object can be found using the following formula:

[tex]d=\frac{m}{v}[/tex]

where [tex]m[/tex] is the mass and [tex]v[/tex] is the volume. We know the block has a mass of 32 grams. We don't know the volume, therefore we must calculate it.

Let's assume the block is a cube. The volume of a cube can be found using the following formula.

[tex]v=l*w*h[/tex]

The length is 8 cm, the width is 4 cm and the height is 2 cm.

[tex]l= 8 cm \\w= 4cm \\h= 2cm[/tex]

[tex]v= 8 cm * 4 cm * 2cm[/tex]

[tex]v=32 cm^2 * 2cm[/tex]

[tex]v= 64 cm^3[/tex]

Now we know the volume and can substitute it into the formula, along with the mass.

[tex]d=\frac{m}{v}[/tex]

[tex]m= 32 g\\v= 64 cm^3[/tex]

[tex]d=\frac{32 g}{64 cm^3}[/tex]

Divide 32 grams by 64 cubic centimeters.

[tex]d= 0.5 g/cm^3[/tex]

The density of the block is 0.5 grams per cubic centimeter. The density of water is 1.0 g/cm³. Any object with a density that is less than 1 will float in water. 0.5 is less than 1, so this object will float in water.

Answer:

There are 1.253*10²⁴ particles in 2.080 moles

Explanation:

Avogadro's number is called the number of particles that make up a substance (usually atoms or molecules) that can be found in the amount of one mole. In other words, Avogadro's number is the number of molecules that one mole of any substance contains.  Its value is 6.023 * 10²³ particles per mole.

So, you can apply a rule of three as follows: if 1 mole has 6.023*10²³ particles, then 2.080 moles, how many particles does it have?

[tex]amount of particles=\frac{2.080 moles*6.023*10^{23}particles }{1 mole}[/tex]

amount of particles= 1.253*10²⁴ particles

There are 1.253*10²⁴ particles in 2.080 moles

Answer:

D.the wavelength of a wave is the distance between two successive peaks or two successive troughs or a peak and trough

Answer:

My answer to the question is wavelength is the distance between two successful cress or successful troughs of a wave. which will be option A.

Answer:

[tex]6.378*10^{6}m[/tex]

Explanation:

we have zeroes so that can be

[tex]6378*10^{3} m[/tex]

and we can continue moving the decimal point three more times

[tex]6.378*10^{6}m[/tex]

Answer:

0.56kg=?mg

0.56kg x (1000 g/1kg) X (1000mg/1g) = 560,000mg

Explanation:

You got it right. Great Job!

Answer:

it helps prove the fact or opinion and test that and archive it

Answer:

(3.6×10^(-3))/(2.1×10^6) = 1.7×10^9 = False

Explanation:

Answer:

See below.

Explanation:

1. The water here is the solvent, and the 'sugar and fruit specific chemicals' are considered the solute. That is as the solute is the component dissolved in the solvent.

2. The collision theory states that the greater the collisions, the greater the rate of reaction. When powdered sugar is placed in the water (solvent) it occupies more surface area, resulting in more collisions that speed up the rate of reaction, compared to a cube of sugar - that occupies less surface area. Therefore, the powdered sugar dissolved faster.

3. Molarity describes the number of moles of a substance per unit of volume. The standard unit of volume is liter, giving you the standard units (mol/l).  Molality describes the number of moles per unit of mass, typically kilograms (mol/kg).

The concentration of a solution can be given in moles of solute dissolved per kilogram of solvent for molality, and moles of solute dissolved in liters of solvent for molarity. Molality is generally used for concentration.

Answer:

125g

Explanation:

you simply add the masses together

Answer:

The energy of a wave is directly proportional to its frequency, but inversely proportional to its wavelength. In other words, the greater the energy, the larger the frequency and the shorter (smaller) the wavelength.

Answer:

In mathematics and physics, the right-hand rule is a common mnemonic for understanding orientation of axes in three-dimensional space. Most of the various left- and right-hand rules arise from the fact that the three axes of three-dimensional space have two possible orientations

Explanation:

Answer:

In mathematics and physics, the right-hand rule is a common mnemonic for understanding notation conventions for vectors in 3 dimensions. It was invented for use in electromagnetism by British physicist John Ambrose Fleming in the late 19th century.

When choosing three vectors that must be at right angles to each other, there are two distinct solutions, so when expressing this idea in mathematics, one must remove the ambiguity of which solution is meant.

Answer:

B.Metal Bhaskar higher density than metal A

Answer:

starch

Cellulose

glycogen

Hope this help :)

Answer: negative

Explanation:

There are two more electrons than protons so the charge is -2.

Answer:   19.71 feet

Explanation:

Given:  Speed of Charlotte =58.6 mi/h

Since 1 hour = 3600 seconds

and 1 mile = 5280 feet

So, Speed of Charlotte = [tex]\dfrac{58.6\times5280}{3600}\approx85.95[/tex] mi/ sec

She looks down at her phone and takes her eyes off the road for 4.36 s.

Since , Distance = [tex]\dfrac{speed}{time}[/tex]

So, Distance = [tex]\dfrac{85.95}{4.36}=19.71\ feet[/tex]

Hence, Charlotte traveled  19.71 feet during this time.

Answer: True

Explanation:

I did the problem online

The mass and the density of the irregularly shaped objects can be measured and estimated by the water displacement method. Thus, the statement is true.

The water displacement method has been defined as the method that measures and estimates the volume and mass of objects that are irregular in shape and can be done by submerging the object in a solution like water.

The water pushed out can be used to measure the mass and the volume of the object if the density is already known. It uses fluid displacement to measure the mass of irregularly shaped objects. Anyone quantity must be known so as to estimate the mass of the object.

Therefore, the statement about the water displacement method to calculate the mass of irregular shapes is true.

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Your question is incomplete, but most probably your full question was, The water displacement method is used to find the mass of an irregularly-shaped solid object. (True or false)

Answer:

So, that students like us get confuse!!!

Explanation:

Answer:

1.Improves electric reliability.

2.Enhance recovery.

3.Promotes clean energy.

Explanation:

Some people suffering from the darkness still had their lights from facilities with microgrids.Power outages they can be dangerous.Microgrids keep the power flowing by disconnecting.It also generate possibly batteries then the microgrids customers are served until power is restored on the Central grid.

Answer:

25000 mm: because 25 m × 1000 mm /1 m = 25000 mm

Explanation:

We can convert 25 m to millimetre (mm) by doing the following:

Recall:

1 m = 1000 mm

Therefore,

25 m = 25 m × 1000 mm /1 m = 25000 mm

25 m = 25000 mm

Thus, 25 m is equivalent to 25000 mm

Answer:

highlight the key words

Explanation:

conjunctions

Answer:

dont know but hey it is me ur freind lol

Explanation:

Answer:

As a result of the network of hydrogen bonding present between water molecules, a high input of energy is required to transform one gram of liquid water into water vapor, an energy requirement called the heat of vaporization. Water has a heat of vaporization value of 40.65 kJ/

Explanation:

Answer:

See the answer below

Explanation:

A drop of syrup would spread through water because water molecules interact and dissolve the syrup molecules and the molecules of the syrup randomly diffuse into the water from the region of higher concentration to the region of lower concentration till they become evenly distributed in the water.

Once the molecules become evenly distributed into the water, an equilibrium is established and there is no longer net movement.