This was on my digital worksheet. I need help, I haven’t used Brainly in a while.

Which statement is correct?

A. Block A has the greatest density.

B. Block B had the greatest density.

C. The density of Block A is equal to the density of Block B.

D. The density of Block B is equal to the density of Block C.

Explanation:

It is given that,

Water flows over Niagara Falls at the average rate of 2,400,000 kg/s

The average height of the falls is 50 m

We need to find the power of Niagara Falls.

The gravitational potential energy of falling water is given by :

P = mgh

Power is rate of doing work i.e.

[tex]P=\dfrac{W}{t}\\\\P=\dfrac{mgh}{t}\\\\P=\dfrac{m}{t}\times gh[/tex]

We have, m/t =  2,400,000 kg/s

So,

[tex]P=2400000\times 9.8\times 50\\\\P=1.176\times 10^9\ W[/tex]

If the number of bulbs are n that could power 15 W LED, the,

[tex]n=\dfrac{1.176\times 10^9}{15}\\\\n=78400000\ \text{bulbs}[/tex]

Answer:

Its an element.

Explanation:

94 on the periodic table

Answer: No

Explanation:  The snacks did not work because the result of the snails either stayed the same, or decreased.

Answer:

The Doppler effect is a change in the frequency of sound waves that occurs when the source of the sound waves is moving relative to a stationary listener. As the source of sound waves approaches a listener, the sound waves get closer together, increasing their frequency and the pitch of the sound.

Explanation:

Answer:

I would recommend them becoming an Analytical Chemist because Analytical Chemists examine and identify various elements and compounds to find out the composition, structure, and nature of substances and they determine the concentration of chemical pollutants in soil, water,and air. I would recommend taking inorganic, organic, analytical, and physical chemistry as well as computer science, physics, and environmental science

Answer:

There are three steps to the Petroleum refining process; separation, modification, and treatment. It would be impossible to drive without gas or diesel fuel. Learn how we get petrol and crude oil and more about gasoline or oil refineries. What is Petroleum? Petroleum is a natural phenomenon.

Explanation:

Answer:

no a toothpick is stronger

Explanation:

i would not seem right

Answer:

4800 times a day

Explanation: she blinks 300 times every hour and i times it by 16 as the hours everyday (24-8) so 300 x 16 equals 4800

Answer:

1.74 g/mL

Explanation:

Step 1: Given data

Mass of magnesium: 4.80 g

Volume of water displaced: 2.76 mL

Step 2: Calculate the volume of the piece of magnesium

The volume of the piece of magnesium is equal to the volume of water displaced in the graduated cylinder.

Step 3: Calculate the density of magnesium

The density of magnesium is equal to its mass divided by its volume.

ρ = m / V

ρ = 4.80 g / 2.76 mL

ρ = 1.74 g/mL

Answer:

analyze data and construct a conclusion  

Explanation:

Answer:

x = 56

relative atomic mass is 58.933

Explanation:

finding the relative molecular mass of x first...

x + (C ×1) + (O ×1) =84

x + (12 ×1) + ( 16 × 1) =84

x + 12 + 16 =84

collect like terms

x = 84-12+16

x= 56

now...

half of 56...

56÷2 =27

and 27 is the atomic number of cobalt...

so relative atomic mass of cobalt is 58.933.

Answer:

THE PRESSURE EXERTED BY THE GAS IS THEREFORE 2.88 atm.

Explanation:

Boyle's law states that at constant temperature, the volume of a given mass of gas is inversely proportional to the pressure of the gas.

Mathematically, P1 V1 = P2 V2

Write out the values of the variables given:

P1 = 2.4 atm

V1 = 1.8 L

V2 = 1.5 L

P2 = unknown

Re-arranging the variables by making P2 the subject of the equation, we have:

P2 = P1 V1 / V2

P2 = 2.4 * 1.8 / 1.5

P2 = 2.9=88 atm

Hence, the pressure exerted by the gas is therefore 2.88 atm

Answer:

Explanation:

The denisty of a substance can be found by using the formula

Making volume the subject we have

From the question

Density = 13.6 g/cm³

mass = 1.50 lbs

We must first convert the lbs to grams in order to solve

That's

if 2.2 lbs = 1 kg

Then 1.50 lbs = [tex] \frac{1.5}{2.2} [/tex]

= 0.681 kg

If 1 kg = 1000 g

Then 0.68 kg = 0.681 × 1000 = 681g

So the mass = 681 g

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

That's

= 50.0735

We have the final answer as

Hope this helps you

Answer:

The volume of the rock is 2 mL

Explanation:

The level to which the graduated cylinder is filled with water by Abby = 3 mL

The level to which the graduated cylinder after the rock is dropped in = 5 mL

Therefore;

The volume of the rock = The level to which the graduated cylinder after the rock is dropped in - The level to which the graduated cylinder is filled with water by Abby

The volume of the rock = 5 mL - 3 mL = 2 mL

The volume of the rock = 2 mL.

Answer:

2

Explanation:

cause it is what it is :> mark me brainlest

Answer:

A-two

Explanation:

Answer:

egg

Explanation:

man

Answer:

Hey there!

Auto-ionization of water is an ionization reaction in pure water or in another aqueous solution, in which a water molecule, H2O, loses the nucleus of one of its hydrogen atoms to become a hydroxide ion, OH−.

Let me know if this helps :)

Answer:

in pure water, H2O molecules undergo a reaction in which two molecules react in such a way that one molecule give its H+ ion to other molecule and become a hydroxyl ion(OH-) and molecule which gain H+ ion become H3O+ ion.

Explanation:

H2O + H2O ⇄ ( H3O+) +( OH-)

Answer:

Explanation:

SODIUM ATOM;

SODIUM ATOM IS NEUTRAL

SODIUM ION;

IT IS A CHARGED SPECIE WITH A CHARGE OF +1

SODIUM ATOM:

THE NUMBER OF PROTONS AND ELECTRONS ARE SAME ie:11

SODIUM ION:

NUMBER OF PROTONS AND ELECTRONS ARE NOT SAME ie. ELETRON: 10, PROTONS:11

HOPE IT WILL HELP:)

Answer:

Mass, m = 19466.7 kg

Explanation:

Given that,

Portland cement concrete (PCC) has a density of 150 lb/ft³

We need to find how many kilograms of PCC are required to cast a cylindrical column 1.15 m in diameter and 7.8 m in height.

Since, 1 kg = 2.205 lb

1 lb/ft³ = 16.018 kg/m³

150 lb/ft³ = 2402.77 kg/m³

Density, [tex]d=\dfrac{m}{V}[/tex]

m is mass of PCC in kg and V is volume of cylinder

[tex]m=d\times V[/tex]

[tex]m=d\times \pi r^2 h\\\\m=2402.77\times \pi \times (1.15/2)^2\times 7.8\\\\m=19466.70\ kg[/tex]

So, the mass of PCC required is 19466.7 kg.

Answer:

Isotopes is a phenomenon whereby atoms of the same element exhibit different mass numbers but have the same atomic number.I hope this helps... Thank you for the question

Answer:

Density = 1.74 gm/mL

Explanation:

Given that:

Mass of piece of Magnesium = 4.80 grams

The volume displaced by this piece = 2.76mL

Let us learn about a property:

Volume of water displaced by a substance when immersed in the water is equal to the Volume of the substance itself.

So, volume of the piece of Magnesium = 2.76 mL

To find:

Density of magnesium = ?

Solution:

Let us have a look at the formula for Density of a Substance:

Density of a substance is given as the ratio of mass of substance and the volume of that mass of substance.

i.e.

[tex]Density = \dfrac{Mass}{Volume}[/tex]

Putting the given values:

[tex]Density = \dfrac{4.80}{2.76}\\\Rightarrow \bold{Density = 1.74\ gm/mL}[/tex]

So, the answer is:

Density of Magnesium = 1.74 gm/mL

Answer:

it gives  CH2OH-CH2OH(ethylene  glycol +MnO2  

Explanation:

Answer:the pic

Explanation:

Answer:

Disposing of the discarded chemicals can be done by certain sfae methods mention as follows:

Explanation:

Most of the chemical wastes are dispose through the EHS waste program. Organic chemicals and solvents that can not be drain should be closed in a tight fitted container that has label on it as Hazardous waste, including strong acid and corrosive liquids.

Recycling of these chemicals and incineration is also use for the industrial chemical waste under professional guidance. Incineration is the process of burning chemicals in to ash through high thermal burning.

Answer: 2400 milliters

Explanation:

Answer:

It should be transferred to a Beaker to finish preparing the solution

Explanation:

NaNO₃ is sodium Nitrate. It is a salt that is soluble in water hence it's aqueous solution can be prepared by dissolving it in water.

A beaker is a laboratory glassware that is used for various functions; one of which includes the preparation of reagents or aqueous solutions of a compound. In the example narrated in the question, the measured NaNO₃ solid can be transferred to a 100 mL or 200 mL beaker and then added to it is the desired volume of water to make the solution 100 mL. This solution can then be stirred with a "glass rod"

Answer:

Explanation:

The density of a substance can be found by using the formula

From the question

mass of cube = 15 g

volume = 75 cm³

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

That's

Hope this helps you

Answer: C. that there may be more than one way to interpret data

Enge 2020 C is the correct answer

Answer:

B.Metal B has higher density than metal A

Density is an intensive property as it does not depend on the quantity of the substances Whereas mass and volume are extensive property. Therefore, the correct option is option B that is  Metal B has higher density than metal A.

Density tells about the compactness of the substances, how much dense is the substances in other words. Object that is more denser than water they just sink in the water.

Mathematically, the formula for density can be given as

Density = Mass of the substance ÷volume marked on the graduated cylinder

From given graph we can see that Metal B has higher density than metal A since the mass of metal B is higher than mass of metal A.

Therefore, the correct option is option B that is  Metal B has higher density than metal A.

To know more about density, here:

https://brainly.com/question/16894337

#SPJ2