Answer:
A yxiigxih5dd8yixc99uf8g
Give reason for the following:
a) An inflated balloon was pressed against a wall after it has been rubbed with a
piece of synthetic cloth. It was found that the balloon sticks to the wall.
b) When an object is thrown up, it comes back to ground.
c) Mountaineers suffer nose bleeding at higher altitudes.
d) Foundations of high rise buildings are kept wide.
e) Deep sea divers or high altitude fliers wear special suits.
f) Walls of a dam are thickened near the base.
a) An inflated balloon was pressed against a wall after it has been rubbed with a piece of synthetic cloth. It was found that the balloon sticks to the wall. This is because a positive and negative electric charge is produced, therefore the balloon sticks to the wall.
b) When an object is thrown up, it comes back to ground because of gravitational attraction force of earth.
c) Mountaineers suffer nose bleeding at higher altitudes because the oxygen level decreases with increase in altitude, which the body cannot adjust.
d) Foundations of high rise buildings are kept wide because more is the area of contact, less is the pressure efforts. So, foundations are wide so as to decrease the possibility of the building from falling down.
e) Deep sea divers or high altitude fliers wear special suits so as prevent their body from being crushed by the water pressure. Since water pressure is maximum at deep seas and oceans, therefore, more is the risk of being injured.
f) Walls of a dam are thickened near the base so that the dam can handle the kinetic energy pressure and prevent itself from breaking down, which if not, can lead to flooding.
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A jewellery shop owner has two identical clear gemstones but cannot remember which one is diamond and which one is rutile. Rutile is a clear gemstone that appears identical to a diamond. It is often used as a cheaper alternative to diamond in jewellery. She is aware that the refractive index of diamond is 2.4 and the refractive index of rutile is 2.9. She has a machine capable of measuring the speed of light through each material and basic measuring equipment. Briefly describe how the shop owner can distinguish between the diamond and rutile gemstones. Use calculations to support your answer.
We know
[tex]\boxed{\sf n_{21}=\dfrac{C}{V}}[/tex]
How he find:-
The owner will measure speed of light through the index(Diamond or rutile).Then using calculations he fill find which is the velocity of diamond or rutile
For diamond[tex]\\ \sf\longmapsto n_D=\dfrac{C}{V_D}[/tex]
[tex]\\ \sf\longmapsto 2.4=\dfrac{3\times 10^8ms^{-1}}{V_D}[/tex]
[tex]\\ \sf\longmapsto V_D=\dfrac{3\times 10^8ms^{-1}}{2.4}[/tex]
[tex]\\ \sf\longmapsto V_D=1.25\times 10^8ms^{-1}[/tex]
[tex]\\ \sf\longmapsto V_D=125\times 10^6ms^{-1}[/tex]
For rutile[tex]\\ \sf\longmapsto n_R=\dfrac{C}{V_R}[/tex]
[tex]\\ \sf\longmapsto V_R=\dfrac{C}{n_R}[/tex]
[tex]\\ \sf\longmapsto V_R=\dfrac{3\times 10^8ms^{-1}}{2.9}[/tex]
[tex]\\ \sf\longmapsto V_R=1.03\times 10^8[/tex]
[tex]\\ \sf\longmapsto V_R=103\times 10^6ms^{-1}[/tex]
When an electromagnetic wave (like light) travels in a given medium, the speed of the wave in the medium depends on the refractive index of the material.
Such that if the refractive index is n₀, the speed of the wave in that material will be:
v = c/n₀
where c is the speed of light in vacuum.
c = 3×10^8 m/s
Now, we know that:
the refractive index of diamond is 2.4
the refractive index of rutile is 2.9
And the owner can measure (in some way) the speed of light through each material.
Looking at the equation of the speed of the wave in a material, we can see that as the index of refraction increases, the velocity should decrease.
Then when the light travels in the rutile (which has a larger index) it will have a smaller velocity than in diamond.
Where the speed in rutile is:
[tex]V_r = \frac{3\cdot 10^8 m/s}{2.9} = 103,448,275.1 m/s[/tex]
And in diamond is:
[tex]V_r = \frac{3\cdot 10^8 m/s}{2.4} = 125,000,000 m/s[/tex]
So measuring the speeds in each cristal, she can know which one is diamond and which one is rutile.
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The meters are
A-B: 60
B-C: 70
C-D: 80
D-E:20
Already answered Pythagorean on E & calculated but not sure what else to write. With the last question in E and the rest of the questions
Answer:
ab 60
Explanation:
What type of plate boundary do plates move apart?
Divergent
Transform
Convergent
Explanation:
Divergent is your answer.
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Answer:
I can help for 2. and 3.
2. 12 m
3. 6 seconds
Explanation:
From my understanding of the first question you would draw a graph that would start at 0 and pass through 3,6 6,12 9,12 12,12 then the the line would go down 15,8 18,4 21,0. I cant see problem 4 hope this helps.
Explain partial eclipse and total eclipse for lunar eclipse in detail and summarise
Answer:
A total eclipse occurs when the dark silhouette of the Moon completely obscures the intensely bright light of the Sun, allowing the much fainter solar aureole to be visible. During any one eclipse, totality occurs at best only in a narrow track on the surface of Earth. This narrow track is called the path of totality.
A partial lunar eclipse happens when part of the Moon enters Earth's shadow. In a partial eclipse, Earth's shadow appears very dark on the side of the Moon facing Earth.
Bonds Quick Check
Metallic bonds are responsible for many properties of metals, such as conductivity. Why is this possible? (1 point)
o Metals have low electronegativity, so they are conductive because they pass charges easily.
Two metals bonded together are going to be more conductive than a metal bonded with a
nonmetal.
O An attraction between a positive charge and a negative charge is created.
The bonds can shift because valence electrons are held loosely and move freely.
Answer:
The bonds can shift because valence electrons are held loosely and move freely.
Explanation:
The metallic bonds are responsible for many properties of metals, such as conductivity, the reason is, the bonds can shift because valence electrons are held loosely and move freely.
Metallic bond is the force that binds two metallic substances together.
The valence electron in this type of bond are always in constant motion, causing the electron to move from one neighboring atom to another.
This free electron character of the valence electron of the metallic bond is responsible for the high electrical conductivity of metals.
The valence electrons are always free to move when an electrical field is applied in the metal.
Thus, the metallic bonds are responsible for many properties of metals, such as conductivity, the reason is, the bonds can shift because valence electrons are held loosely and move freely.
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Wat is acceleration!???
Explanation:
Acceleration , rate at which velocity changes with time, in terms of both speed and direction.1. What are the independent and dependent variables in each of the experiments?
A one kilogram stone, falling freely form a height of 10 m , strikes the ground with a velocity
Answer:
14.1m/s
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Temperature is a measure of how hot or cold
something is but need
Explanation
Answer:
Temperature is a measure of the average kinetic energy of the particles in an object.
Using the modern celcius system of temperature measurement, We. an easily determine how hot or cold it is. It was also know as Centigrade. This is because it is based on the freezing and boiling points of water with 100 degrees between those temperatures.
Calculate the sum of the following numbers to the appropriate number of significant figures.
32.567 + 135.0 + 1.4567
Answer:
The answer is 169.0.
Explanation:
For addition and subtraction problems with significant figures, the answer should be rounded to the same number of decimal places as the measurement with the least number of decimal places.
Rules for Significant Figures:
All non-zero digits are considered significant. For example, 91 has two significant figures (9 and 1), while 123.45 has five significant figures (1, 2, 3, 4, and 5).Zeros appearing between two non-zero digits (trapped zeros) are significant. Example: 101.12 has five significant figures: 1, 0, 1, 1, and 2.Leading zeros (zeros before non-zero numbers) are not significant. For example, 0.00052 has two significant figures: 5 and 2.Trailing zeros (zeros after non-zero numbers) in a number without a decimal are generally not significant. For example, 400 has only one significant figure (4).Trailing zeros in a number containing a decimal point are significant. For example, 12.2300 has six significant figures: 1, 2, 2, 3, 0, and 0. The number 0.000122300 still has only six significant figures (the zeros before the 1 are not significant). In addition, 120.00 has five significant figures since it has three trailing zeros.The number 0 has one significant figure. Therefore, any zeros after the decimal point are also significant. Example: 0.00 has three significant figures.Any numbers in scientific notation are considered significant. For example, 4.300 x 10-4 has 4 significant figures.5 reasons why people should use electricity wisely
Answer:
1. heating
2. entertainment
3. cooling
4.educational purpose
5.comfort
? (Water is used to cool down the motor engine, why?
Answer:
Most commonly anti-freeze is used in the motor engine, but water is sometimes used because it has a high thermal conductivity.
Explanation:
One astronomical unit (AU) is about 1.5 x 108 km. Explain why this is the same as 150 x 100 km.
Answer:
To change 150x106 km to scientific notation, the leading number must be reduced to a
number between 1 and 9.99999.... To do this, one must dDIVIDE by 100, yielding 1.50.
In order to keep the entire quantity the same, one must then MULTIPLY the exponential
part of the number of 100. This is equivalent to increasing the exponent from 6 to 8.
Explanation:
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Fun Fact: A cow-bison hybrid is called a “beefalo”
Two representative elements are in the same period of the periodic table. Which statement correctly describes the atoms of the two elements?(1 point)
They have the same number of valence electrons.
They have the same number of valence electrons.
They have valence electrons in different energy levels.
They have valence electrons in different energy levels.
They have valence electrons in the same energy level.
They have valence electrons in the same energy level.
They have the same number of electrons.Helium is in group 18 of the periodic table. How is helium different from the other elements in this group?(1 point)Helium atoms have valence electrons in the first energy level, while atoms of the other elements in the group have valence electrons in the second energy level.
Helium atoms have valence electrons in the first energy level, while atoms of the other elements in the group have valence electrons in the second energy level.
Helium atoms have 2 valence electrons, while atoms of the other elements in the group all have 8 valence electrons.
Helium atoms have 2 valence electrons, while atoms of the other elements in the group all have 8 valence electrons.
Helium atoms have a full outer energy level, while atoms of the other elements in the group do not have a full outer energy level.
Helium atoms have a full outer energy level, while atoms of the other elements in the group do not have a full outer energy level.
Helium atoms have 2 electrons, while atoms of the other elements in the group all have 18 electrons.
Use the periodic table to answer the question.
Which element has atoms with valence electrons in a higher energy level than those of calcium (Ca)?
lithium (Li)
lithium (Li)
cesium (Cs)
bromine (Br)
oxygen (O)
Use the periodic table to answer the question.
Which statement best describes the arrangement of electrons in an atom of fluorine (F)?
There are seven electrons in the first energy level and two electrons in the second energy level.
There are seven electrons in the first energy level and two electrons in the second energy level.
There are five electrons in the first energy level and two electrons in the second energy level.
There are five electrons in the first energy level and two electrons in the second energy level.
There are two electrons in the first energy level and seven electrons in the second energy level.
There are two electrons in the first energy level and seven electrons in the second energy level.
There are two electrons in the first energy level and five electrons in the second energy level.
Elements in the periodic table are arranged in the increasing order of their atomic number.
An atom will contain equal amount of protons and electrons. If two elements are in same period of periodic table then these elements will have same number of electrons.
Helium is one of the seven elements which are called as noble gases. This gas is odorless, tasteless and colorless which makes it unique from other elements.
It has two valence electrons while atoms of other elements in the group have 8 valence electrons.
Lithium has one valence electron, while calcium atom has 2 valence electrons.
The highest level of energy is due valence electrons of an atom. The correct answer is Lithium.
Fluorine element has 9 electrons. There are 2 electrons in the first energy level and seven electrons in the second energy level.
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Answer: m/s north
explanation
Name the component that reduces the flow of charge in the circuit.
Explanation:
Component Function
Closed switch
Electrical wire
Resistor A component that opposes or inhibits electrical current in a circuit. It can also convert electrical energy to heat or light.
Variable resistor A resistor whose resistance can be adjusted higher or lower.
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what are intermolecular forces
Answer:
The term “INTERmolecular forces” is used to describe the forces of attraction. BETWEEN atoms, molecules, and ions when they are placed close to each other. •
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Answer: are the forces which mediate interaction between molecules, including forces of attraction or repulsion which act between atoms and other types of neighboring particles, e.g. atoms or ions.
Explanation:
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Hi :)
The formula for velocity is
v = displacement / change in time
velocity = 100 m / 4 seconds
velocity = 25 m/s
The formula for velocity is
v = displacement / change in time
velocity = 100 m / 4 seconds
velocity = 25 m/s
If I walk 30 m north and turn around and walk 10 m to the south, what is the magnitude
of my displacement in meters?
Answer:
40m
Explanation:
Your total displacement would be 40m! Let me explain.
Going 30m north adds 30 to 0... so your total right now is 30m.
if you turn around and walk 10 m you have to add that 10 to the 30.
so your total displacement is 40m.
How many covalent bonds is phosphorus (Group 5A) likely to form? (1 point) O five O four two three
Answer:
Three
Explanation:
Group 5A elements like phosphorus form 3 covalent bonds.
Answer: 3
Explanation:
Is the sentence "the temperature outside is 250 C." Qualitative or quantitative
Answer: Quantitative
Explanation: because quantitative is numbers
the density of the metal is 8.9g/cm³.what does it mean. What is the importance of the value
Density of the metal is 8.9g/cm^3
It means per 1cm^3 Volume there is 8.9g of Mass occupied .Density:-
[tex]\boxed{\sf Density=\dfrac{Mass}{Volume}}[/tex]
SI unit:-
SI unit of density is kg/m^3
CGS unitCGS unit of density is g/cm^3
If someone asks you what the volume of a box is, what are they asking?
Answer:
only God knows what they are asking
If the speed of light is 3.0*10(8) m/s, and the moon is 404,927 km away, how long would it take a radio signal to go from earth to the moon and back again
Answer:
Explanation:
formula
t = d/r
d = 404927 km or 404927000 meters
r = 3 * 10^8 m/s
t = 404927000 / 3 * 10^8
t =1.35 seconds.
That's one way. To get it to go all the way and back multiply by 2
t = 2 * 1.35
t = 2.70 seconds
the weight of elephant is 40000N. The area of its feet in contact with the ground is 0.25 m2. Show your working and give the unit
Answer:
P=160000Pa
Explanation:
You haven't specified what to calculate
But looking at the parameters I think the question is asking to calculate the pressure exerted.
Pressure=Force/Area
P=40000/0.25m²
P=160000Pa
Relative densoty hydrometer puridy of milk
Answer:
Hope this can help u
Explanation:
A lactometer is a specialized hydrometer used measure the relative density and purity of milk. ... If the milk is pure the readings will be close to 1 and if the amount of water in the milk increases then the markings will be close to 3.
cho hình vuông ABCD, tại A và C đặt các điện tích q1=q3=q. Hỏi phải đặt ở B một điện tích bằng bao nhiêu để cường độ điện trường bằng 0
explain thermal equilibrium?
Answer:
Heat is the flow of energy from a high temperature to a low temperature. when these temperature balance out, heat stops flowing, then the system (or set of system) is said to be in thermal equilibrium.