Answer:
The kinetic energy of the boy is 20 times that of the kinetic energy of the girl.
Explanation:
It is given that,
The mass of the boy is 20 times that of girl.
Let [tex]m_b[/tex] and [tex]m_g[/tex] are the mases of boy and the girls.
A boy and girl are running with the same speed.
The formula for the kinetic energy is given by :
[tex]E=\dfrac{1}{2}mv^2[/tex]
Where m is mass and v is speed
As speed is same for both boy and girl.
Kinetic energy of a girl,
[tex]K_g=\dfrac{1}{2}m_gv^2[/tex] ...(1)
As [tex]m_b=20m_g[/tex]
Kinetic energy of a boy,
[tex]K_b=\dfrac{1}{2}m_bv^2\\\\=\dfrac{1}{2}\times 20m_g\times v^2\ ....(2)[/tex]
From equation (1) and (2) :
[tex]\dfrac{K_g}{K_b}=\dfrac{\dfrac{1}{2}m_gv^2}{\dfrac{1}{2}m_bv^2}\\\\=\dfrac{\dfrac{1}{2}m_gv^2}{\dfrac{1}{2}\times 20 m_gv^2}\\\\\dfrac{K_g}{K_b}=\dfrac{1}{20}\\\\K_b=20K_g[/tex]
So, the kinetic energy of the boy is 20 times that of the kinetic energy of the girl. Hence, this is the required solution.
What is the balanced chemical equation for Benzoic acid + octanol ?
Answer:
C7H6O2+C8H17OH=C15H22O2+H2O
Explanation:
by reacting alcohol and acid we get ester and water
If you have 116 grams of Table Salt (NaCl), how many moles of salt do you have?
a
Ob
1.99 g
3.27 g
5.05 g
0.50 g
d
Question 8 point
Answer:
a. 1.99 mol
General Formulas and Concepts:
Chemistry - Atomic Structure
Reading a Periodic TableUsing Dimensional AnalysisExplanation:
Step 1: Define
116 g NaCl
Step 2: Identify Conversions
Molar Mass of Na - 22.99 g/mol
Molar Mass of Cl - 35.45 g/mol
Molar Mass of NaCl - 22.99 + 35.45 = 58.44 g/mol
Step 3: Convert
[tex]116 \ g \ NaCl(\frac{1 \ mol \ NaCl}{58.44 \ g \ NaCl} )[/tex] = 1.98494 mol NaCl
Step 4: Check
We are given 3 sig figs. Follow sig fig rules and round.
1.98494 mol NaCl ≈ 1.98 mol NaCl
Give the hybridization for the O in H3O+
Answer: It would be Sp2, because H3O+ has planar structure.
Elements from which group of the periodic table are most likely to form covalent network solids?
A. Group 6
B. Group 3
C. Group 4
D. Group 5
Answer:
C. group 4 .................
Why does the complete combustion of methane and octane produce the same product?E
Answer:
Because they are both of the same functional groups (alkane)
When the equation H₂ + N₂ --->NH₃ is completely balanced using the smallest whole numbers, the sum of all the coefficients will be
Answer:
6
Explanation:
The equation given in this question is:
H₂ + N₂ ---> NH₃
To balance this equation i.e to make sure that the number of atoms on each side of the equation is the same, one would make use of coefficients.
The balanced equation is:
3H₂ + N₂ ---> 2NH₃
The coefficients are the number behind each element or molecule. According to this question, the sum of each coefficient is 3 + 1 + 2 = 6
outline two methods used by designers to assemble packages
Answer:
Product packaging design refers to the production of a product's exterior. Develop an organization. All these specifics allow one to consider what the sealed substance is about how to use it, who can use it, and maybe, What do you sell? For your product, there are several different packaging forms available.
Explanation:
Cesium-133 has an atomic number of 55. It has
neutrons.
Answer:
The answer is 78
Explanation:
133 - 55 = 78
How many atoms are in 2NaCHO2
What kind of material will reduce the flow of heat energy?
Can anyone explain this to me?
Who discovered phosphate?
Answer:
Hennig Brand
Explanation:
HELP ASAP MY LESSON IS BEING TIMED!!!
1) Choose the correct answer.
_____ states when one object applies a force on a second object, the second object applies an equal force in the opposite direction.
Newton’s third law of motion
The law of conservation of momentum
The law of conservation of energy
2) Choose the correct answer.
The law of conservation of momentum states that the total movement of a group of objects stays the same unless acted on by _____ forces.
unbalanced
balanced
opposite
3) Choose the correct answer.
Forces work in pairs; the _____ force is the initial force applied to an object.
momentum
action
reaction
Answer:
1. Newton's third law of motion
2. Unbalanced
3. Action
Which statement describes why the viscosity of olive oil is higher than that of rubbing alcohol?
Answer:
D
Explanation:
Most of the fluids have some resistance to their movement due to viscosity. The gases also exhibit viscosity. The molecules that make up olive oil are larger as compared to alcohol. So olive oil has high viscosity. The correct option is D.
What is viscosity?The viscosity of a fluid can be defined as the measure of a fluid's resistance to flow. It can also be known as the measure of a fluid's thickness or its resistance to the objects passing through it.
A fluid with high viscosity resists motion because of its strong intermolecular forces which gives high internal friction. The fluids can flow easily if they have very little intermolecular force of attraction. The SI unit of viscosity is poiseiulle (PI).
Here the molecules which make up the olive oil are found to be shorter than those which make up alcohol. So the oilve oil molecules have more resistance to sliding past one another.
Thus the correct option is D.
To know more about viscosity, visit;
https://brainly.com/question/30759211
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Please help me!!!!!!!!!!!!!!
How does the smell of food being cooked spread so fast ???
Answer:
When we cook food in the kitchen, that's the region of higher concentration of the smell. By diffusion, the smell spreads to the whole room and thereby whole house, so anyone standing at a distance, can smell it.
Answer:
smell of cooked food spread fast bc when something is heated up, the kinetic energy of the molecules/particles increases and some of them even mix with the air and moves around. the first answer is also correct (i just explained it more detaily)
so, this is the reason :)
mark as brainliest dagini ;)
what are the significance of chemical bond?
Explanation:
it helps to provide the energy which is necessary to hold two different atoms together as part of chemical compound.
Hydrogen sometimes is “blank” an electron and sometimes it has an “blank” electron.
Hydrogen sometimes is missing an electron and sometimes it has an extra electron.
Helium (He) and hydrogen (H) are unique elements. Hydrogen has the abilities and electrons of two groups, one and seven, and occasionally has more electrons than it does.
What are electrons?Electrons are defined as a subatomic particle with a negative charge that makes up the nucleus of an atom along with protons and neutrons. For scientists, it can be challenging to monitor them because of how quickly they spin. The tiniest particles in an atom, you can put 2000 of them into a proton, they are drawn to the positive charge of the protons.
Because it has no neutrons in its nucleus, hydrogen (particularly hydrogen -1) is unusual. There is only one proton in the nucleus of hydrogen. The only element without neutrons is this one. Although it has a single electron orbiting its nucleus as well, hydrogen typically contributes this electron to form a single, positively charged proton instead.
Thus, Helium (He) and hydrogen (H) are unique elements. Hydrogen has the abilities and electrons of two groups, one and seven, and occasionally has more electrons than it does.
To learn more about electrons, refer to the link below:
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what would happen to the volume of 10L carbon dioxide, if the pressure is doubled and temperature is constant?
Answer:
The volume will goes to decrease.
Explanation:
The given problem will be solved through the Boyle's law,
"The volume of given amount of gas is inversely proportional to its pressure by keeping the temperature and number of moles constant"
Mathematical expression:
P₁V₁ = P₂V₂
P₁ = Initial pressure
V₁ = initial volume
P₂ = final pressure
V₂ = final volume
when pressure is going to increase the volume will goes to decrease and vice versa.
Consider the initial volume is 10 L at initial pressure of 15 atm when pressure is increased to 30 atm the volume will be,
Now we will put the values in formula,
P₁V₁ = P₂V₂
15 atm × 10 L = 30 atm × V₂
V₂ = 150 atm. L/ 30 atm
V₂ = 5 L
How many seconds in 16 years? (Ignore leap years). show work
Answer:
There are 504,576,000 seconds in 16 years.
Explanation:
To calculate the number of seconds in 16 years, let's first use simpler units since we are going to be working with large numbers.
First, calculate the number of seconds in one day (24 hours). We can do this with the common knowledge that there are 60 seconds in a minute, and 60 minutes in an hour, multiply the seconds and minutes:
[tex]60*60=3600[/tex]
Therefore, there are 3600 seconds in an hour. Since we know that there are 24 hours in a day, we can multiply the seconds by hours:
[tex]3600*24=86400[/tex]
Therefore, there are 86,400 seconds in a day.
Knowing that there are 365 days in a year, we can multiply 86,400 seconds by 365 days to calculate the number of seconds in a year:
[tex]86400*365=31536000[/tex]
Therefore, there are 31,536,000 seconds in a year.
Since the question is asking the number of seconds in 16 years, we can simply multiply 31,536,000 seconds by 16 years:
[tex]31536000*16=504576000[/tex]
Therefore, there are 504,576,000 seconds in 16 years.
A student heats a LaTeX: 2.5 g sample of calcium carbonate in a test tube. What mass of calcium oxide remains in the test tube when the reaction is complete?
CaCO3(s) to CaO(s) + CO2(g)
Select one:
a) 1.4 g CaO
b)2.1 g CaO
c)2.5 g CaO
d)1.0 g CaO
Answer:
2.5
Explanation:
If a sodium ion has 11 protons, 12 neutrons, and 11 electrons, what is the atomic mass of the atom?
Answer:
23
Explanation:
we do not care about electrons, so 11 + 12 = 23
How many molecules of NH3 will be produced if I use 10g of H2?
Answer:
20.05 ×10²³ molecules
Explanation:
Given data:
Mass of hydrogen = 10 g
Number of molecules of ammonia = ?
Solution:
Chemical equation:
3H₂ + N₂ → 2NH₃
Number of moles of hydrogen:
Number of moles = mass / molar mass
Number of moles = 10 g / 2 g/mol
Number of moles = 5 mol
now we will compare the moles of hydrogen and ammonia.
H₂ : NH₃
3 : 2
5 : 2/3×5 = 3.33 mol
Number of molecules of ammonia:
1 mole contain 6.022 ×10²³ molecules
3.33 mol × 6.022 ×10²³ molecules / 1 mol
20.05 ×10²³ molecules
Which of the following is NOT a sign of a chemical reaction:
a
bubbles
b
precipitate
c
changing from liquid to gas
d
color change
You can tell if an object is in motion if ___.
A. Its reference point is in motion
B. Its reference point is stationary
C. Its position changes relative to a reference point
D. It appears to move backward when another object moves forward
Answer:
c
Explanation:
I think that's the answer
The chemical or mechanical processes by which rocks when exposed to the weather undergo changes in character and break down are called?
gravity sedimentation weathering magma
Answer:
weathering
Explanation:
the rocks due to rain generate cracks . heat and wind helps the rock to break into smaller chunks .
this process continuous till the rock is converted into sand. and is called weathering
Which two body systems are most affected when a person is participating in a marathon running event?
A. endocrine and digestive
B. Endocrine and muscular
c. skeletal and digestive
d. skeletal and muscular
Answer:
d. skeletal and muscular
Please explain thank you! Xoxo!
PLEASE HELP ME DO THIS ONE ITS DUE IN 5 MINUTES THANKS!! HAVE A GREAT DAY!!
Answer:
To persuade at any means necessary. Ex. I bribed a man with money.
Answer:
the underlined word is "bribes" which means you try to temp the gaurds to take money and in return you get something back. for example, i bribe someone with money to bring me a zebra from africa because its illiegal but you get persuaded with money to do it
Explanation:
how are molecules, mixtures, and pure substance related
Answer:
Pure substances are further broken down into elements and compounds. ... A chemical substance is composed of one type of atom or molecule. A mixture is composed of different types of atoms or molecules that are not chemically bonded.
Explanation: