Answer:
800 m
Explanation:
Acceleration (a) = Velocity (v) / Time(t)
a = (v-u) /t
where, v = final speed
u = initial speed
2m/s² = (40m/s - 0m/s)/t
that is, from rest is no speed.
2m/s² = (40m/s) /t
t = (40m/s)/2m/s²
t = 20 s
hence, the car has accelerated for 20 s.
From,
Velocity (v) = Displacement (d) /time(t)
displacement is the distance the car has travelled.
40m/s = d/20s
d = 40m/s × 20s
d = 800 m
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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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.
HOPE IT HELPS...
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.
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
A body weights 50 N in air and 45 N when wholly immersed in water calculate (i) the loss in weight of the body in water (ii) the upthrust on the body. (iii) volume of the body.
Answer:
[tex]difference \: in \: weight = 150n - 100n = 50n[/tex]
Now,buyantant force
[tex]difference \: in \: weight \: = volume(body) \times density \: of \: water \: \times g[/tex]
so;
[tex]50 = {v}^{b} \times 1 \times {10}^{3} \times 9.8m {s}^{2}[/tex]
[tex] {v}^{b} = \frac{50}{1000 } \times 9.8[/tex]
[tex] = \frac{50}{9800} [/tex]
[tex] = 0.0051[/tex]
Now,
[tex]mass \: in \: air \: = 150n = \frac{150}{9.8kg} [/tex]
[tex]density = \frac{weght}{volume} [/tex]
[tex] = \frac{150}{0.0051} \times 9.8 \\ x = 3000[/tex]
And now,
[tex]specific \: density \: = \frac{density of \: the \: body}{density \: of \: water} [/tex]
[tex] = \frac{3000}{1000} [/tex]
[tex] = 3[/tex]
Hence that,specific density of a given body is 3
please mark me as brainliest, please
Which of your groups should you NOT change anything for? (in other
words, everything stays the same for this group)
A.Experimental
B.Control
C.Quantitative
D.Qualitative
Answer:
B
Explanation:
The control is something that is meant to not be changed, the control is a comparison of the experimental.
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
Hope it helps
Have a great day
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.
Calculate the sum of the following numbers to the appropriate number of significant figures.
658.0 + 23.5478 + 1345.29
Is the sentence "the temperature outside is 250 C." Qualitative or quantitative
Answer: Quantitative
Explanation: because quantitative is numbers
A snail at position 3 cm moves to position 20 cm in 8 seconds
What is it's velocity ?
What is it's displacement ?
Answer:
no worries
Explanation:
Leave it to me.
Answer:
17 cm
Because the equation you're using is ∆d=df
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.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:
Can someone do my physics work for $150?
Answer:
sure
Explanation:
what/where is the work
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:
hope this helps
Fun Fact: A cow-bison hybrid is called a “beefalo”
Michael decides to do an experiment to determine which type of sock
absorbs the most sweat. Which of these describes him doing step one of the
inquiry process?
A. Michael measures the weights of six different kinds of socks
before and after he goes running,
B. Michael finds that all-polyester socks weigh 0.05 ounce more after
he runs in them.
C. Michael predicts that all-cotton socks will absorb the most sweat,
because he thinks cotton is very absorbent.
O D. Michael asks himself which of the many types of socks in his
drawer looks like it can absorb sweat most effectively.
Someone decode this please
My friend sended this he said it was a bit horror but yeah i need help with this
Answer:
what is it for
Explanation:
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
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
Use the list to answer the question.
potassium, Group 1
calcium, Group 2
iodine, Group 17
neon, Group 18
Which two elements in the list would bond together based on their ionic charges?(1 point)
potassium and neon
potassium and iodine
calcium and neon
calcium and potassium
Answer: Potassium and Iodine
Explanation:
I took the quick check and it’s right.
Help due today as well
Answer: m/s north
explanation
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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hey!! need this asap!! will mark brainliest! thank you in advance!
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.
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.
5 reasons why people should use electricity wisely
Answer:
1. heating
2. entertainment
3. cooling
4.educational purpose
5.comfort
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.
if my answer helps you than mark me as brainliest
A 210 Ohm resistor uses 9.28 W of
power. How much current flows
through the resistor?
(Unit = A)
[tex]\boxed{\sf P=I^2R}[/tex]
[tex]\\ \sf\longmapsto I^2=\dfrac{P}{R}[/tex]
[tex]\\ \sf\longmapsto I^2=\dfrac{9.28}{210}[/tex]
[tex]\\ \sf\longmapsto I^2\approx0.04[/tex]
[tex]\\ \sf\longmapsto I\approx\sqrt{0.04}[/tex]
[tex]\\ \sf\longmapsto I\approx\sqrt{\dfrac{4}{100}}[/tex]
[tex]\\ \sf\longmapsto I\approx\dfrac{\sqrt{4}}{\sqrt{100}}[/tex]
[tex]\\ \sf\longmapsto I\approx\dfrac{2}{10}[/tex]
[tex]\\ \sf\longmapsto I\approx0.2A[/tex]
Answer:
.21
Explanation:
acellus
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: