Answer:
The heart belongs to the Cardiovascular system. Along with blood vessels and the blood.
we do not use water instead of mercury in a barometer
Answer:
Mercury is commonly used in barometers because its high density means the height of the column can be a reasonable size to measure atmospheric pressure.
How did the atomic theory develop and change
Explanation:
Early Atomic theory
Although the idea of the atom was first suggested by Democritus in the fourth century BC, his suppositions were not useful in explaining chemical phenomena, because there was no experimental evidence to support them. It was not until the late 1700's that early chemists began to explain chemical behavior in terms of the atom. Joseph Priestly, Antoine Lavoisier, and others set the stage for the foundation of chemistry. They demonstrated that substances could combine to form new materials. It was the English chemist, John Dalton, who put the pieces of the puzzle together and developed an atomic theory in 1803.
Dalton's atomic theory contains five basic assumptions:
All matter consists of tiny particles called atoms. Dalton and others imagined the atoms that composed all matter as tiny, solid spheres in various stages of motion.
Atoms are indestructible and unchangeable. Atoms of an element cannot be created, destroyed, divided into smaller pieces, or transformed into atoms of another element. Dalton based this hypothesis on the law of conservation of mass as stated by Antoine Lavoisier and others around 1785.
Elements are characterized by the weight of their atoms. Dalton suggested that all atoms of the same element have identical weights. Therefore, every single atom of an element such as oxygen is identical to every other oxygen atom. However, atoms of different elements, such as oxygen and mercury, are different from each other.
In chemical reactions, atoms combine in small, whole-number ratios. Experiments that Dalton and others performed indicated that chemical reactions proceed according to atom to atom ratios which were precise and well-defined.
When elements react, their atoms may combine in more than one whole-number ratio. Dalton used this assumption to explain why the ratios of two elements in various compounds, such as oxygen and nitrogen in nitrogen oxides, differed by multiples of each other.
John Dalton's atomic theory was generally accepted because it explained the laws of conservation of mass, definite proportions, multiple proportions, and other observations. Although exceptions to Dalton's theory are now known, his theory has endured reasonably well, with modifications, throughout the years.
A boat sailed 7 hours at speed of 80km/h
Answer:
No it’s 1,130
Explanation:
I did online
A football coach walks 18 meters westward, then 12 meters
eastward, then 28 meters westward, and finally 14 meters
eastward.
Answer:
Displacement = 20
Direction = westward
Explanation:
Given that a football coach walks 18 meters westward, then 12 meterseastward, then 28 meters westward, and finally 14 meters
eastward.
To calculate the displacement,
Let eastward = negative
Westward = positive
Displacement = 18 - 12 + 28 - 14
Displacement = 46 - 26
displacement = 20 metre
Since the answer is positive, the direction is westward.
HELP!!! IM BEING TIMED AND I RLLY NEED HELP
Answer:
4.3446× 10^6
3.2156305×10^3
7.68841×10^-6
1.2153698×10^1
9.5677734
Explanation:
A scientist is trying to identify an unknown cell. He determines that it has a nucleus and lysosomes.
It also contains a cell membrane, but does not have a cell wall. What type of cell is the scientist most likely looking at?
Choose 1 answer:
(Choice A) A Animal cell
(Choice B) B Fungal cell
(Choice C) C Plant cell
(Choice D) D Bacteria
Answer:
Choice A) A Animal cell
Explanation:
Answer:
A.
Explanation:
I am the distance between waves what am l
Answer:
My answer to the question is Wavelength
Answer:
Wavelength
Explanation:
Since this riddle is talking about “Distances”, wavelength is the distance between the crest of waves. This riddle and wavelength is similar... so I’m guessing the answer should be wavelength.
Therefore your answer would be Wavelength.
Hope this was helpful! :)
Brainliest would be highly appreciated! Thanks! :)
Explain why lenses are used for particular applications. ( please write a long detailed answer )
Answer:
Lenses are very important for us. Without lenses even we can't imagine the world. Without lenses our life is like life without colors.
Explanation:
Lenses are used everywhere around us in car, truck, glass, headlamps etc. It is also present in the flashlight of the LED light that is used in electronic materials.
Our eyes have also most amazing lenses. When you look at ground, at sky, and staring at moon all that happen that because of our binocular lenses. Our eyes have two type of lenses that concave lenses and convex lenses.
By these lenses we can see far and near object6s easily. Thus we used special applications of lenses to see the objects.
A ruler has a division of 1mm. You use the ruler to measure a piece of paper. You find that it is 7.4 cm wide and 8.3 cm long. What is the area of the piece of paper?
Answer:
6,142mm²Explanation:
Given the dimension of a paper measured by a ruler as 7.4 cm wide and 8.3 cm long, the area of the paper is expressed using the area for calculating the area of a rectangle as shown;
Area of the piece of paper = Length * Width
Given length = 7.4cm
Length = 74mm (Since 10mm = 1cm)
Width = 8.3cm
Width (in mm) = 83mm
We converted to mm since the ruler used to measure has a division of 1mm.
Substituting the given values into the formula, we will have:
Area of the piece of paper = 74mm * 83mm
Area of the piece of paper = 6,142mm²
Hence, the area of the piece of paper is 6,142mm²
A freely suspended magnet does not point exactly at the geographical N-S direction
john can travel to atlanta 560 miles in 9 hours what is his velocity
Answer:
132
Explanation:
Rhonda watched a video taken by a camera that was lifted into the upper atmosphere by a weather balloon. She saw the balloon pop when it reached a certain height. Afterward, Rhonda wondered what effect the air pressure at high altitudes has on the volume of gas in balloons. What scientific practice is Rhonda performing? asking a question providing explanations communicating results performing an investigation
Answer:
asking a question
Explanation:
Which title best fits Rahma's note
Rahma took these notes on a process involving the
movement of molecules, but she forgot to title them.
-Causes molecules to move until they are evenly
distributed
-Moves from high concentration to low
concentration
-Has no need for added energy
-Can occur with or without a membrane being
present
Active Transport in Cells
O Passive Transport in Cells
o Osmosis
O Diffusion
FIRST ANSWER GETS BRAINIEST
Answer:
diffusion is the answer.
Answer:diffusion
Explanation: it right
Dr. James hypothesizes that his patient, Jacob, misbehaves in class because it allows him to get attention from his
peers.
Which perspective BEST fits Dr. James beliefs about Jacob's actions?
Answer:
Hey there!
The answer would be a Behavioral perspective.
Let me know if this helps :)
An object with a density of 0.85 g/cc is dropped into each of the two beakers shown below. Beaker 1 has a density of 0.5 g/cc. Beaker 2 has a density of 1 g/cc. What will happen to the object in each case?
Answer:
The object will sink in the liquid in beaker 1.
The object will float in the liquid in beaker 2
Explanation:
The density of an object relative to the density of a fluid determines if the object floats or sink in a fluid. The density of a material is the measure of the amount of mass of that material packed into a unit volume of that material.
For the beaker 1, the liquid in this beaker has a density of 0.5 g/cc, which is lesser than the density of the object (0.85 g/cc). This means that the object will add more mass than there should be to the volume of the space it displaces within the field. This results in the object sinking in the fluid.
For beaker 2, the liquid in this beaker has a density of 1 g/cc, which is more than the density of the object (0.85 g/cc). This means that the object will add less mass than there should be to the volume of the space it displaces within the field. This results in the object floating in the fluid.
PLEASE ANSWER THIS WORKSHEET ITS DUE TODAY WILL GIVE BRAINLIEST BALANCED AND UNBALANCED WORKSHEET
Answer:B. NET force: 2 resultant motion: left
ItsOniiSama avatar
C. Net force: 3 Resultant motion: Left
ItsOniiSama avatar
D. Net Force: 7 Resultant motion: right
ItsOniiSama avatar
E. Net Force:0 resultant motion: NO MOTION
ItsOniiSama avatar
F. NET Force: 3 resultant motion: Down
ItsOniiSama avatar
G. NET FORCE: 10 resultant motion: up
ItsOniiSama avatar
H. Net force: 3 Resultant motion: left
ItsOniiSama avatar
I. Net force: 50 Resultant motion: right
ItsOniiSama avatar
J. NET FORCE: 75 Resultant motion: down
ItsOniiSama avatar
K. Net force :200 Resultant motion: Right
ItsOniiSama avatar
L. Net force: 0 resultant motion:No motion
Explanation:
which of the following substances is a base? ammonia, distilled water, lemon juice, or vinegar
who is the winner of khatron khiladi made in india 2020
Answer:
karishma tanna
Explanation:
it is correct
Karishma Tanna was declared as the winner.
A boat that moves with a constant velocity of 12 m/s is moving on a river with a
constant current of 4 m/s. What is the resultant velocity of the boat if:
a) The boat is traveling to the north and the current is to the south?
b) The boat is traveling to the south and the current is to the south?
c) The boat travels to the east, across the current, while the current is to the south.
Explanation:
Given that,
Velocity of boat, [tex]v_b=12\ m/s[/tex]
Velocity of current, [tex]v_c=4\ m/s[/tex]
(a) If the boat is traveling to the north and the current is to the south,
[tex]v_b=12j\ m/s[/tex]
[tex]v_c=-4j\ m/s[/tex]
The resultant velocity,
[tex]v_r=12-(4)=8\ m/s[/tex] due North
(b) If boat is traveling to the south and the current is to the south,
[tex]v_b=-12j\ m/s[/tex]
[tex]v_c=-4j\ m/s[/tex]
Resultant velocity,
[tex]v_r=12+4=16\ m/s[/tex] due south
(c) If the boat travels to the east, across the current, while the current is to the south.
So,
[tex]v_r=\sqrt{12^2+4^2}\\ \\v_r=12.64\ m/s[/tex]
WILL GIVE BRAINLIEST AND A THANKS TO FIRST CORRECT ANSWER!!!!
Which statements describe processes involved in the accretion of planetesimals and protoplanets? Check all that apply.
Both involve the melting of solid materials in the nebula.
Both involve the formation of solid particles from nebular materials.
Both involve the work of the gravitational push on nebular materials.
Both involve the trapping of gases and the clumping of masses of matter.
Both involve the growing of gas grains with the addition of atoms and molecules.
Answer:2 and 4th one
Explanation:
a kayaker moves 32 meters northward then 6 meters southward finally 24 meters northward
Answer:
50 metres.
Explanation:
Given that a kayaker moves 32 meters northward then 6 meters southward finally 24 meters northward
To calculate the displacement, let assume that
Northward = positive
Southward = negative
Displacement = 32 - 6 + 24
Displacement = 56 - 6
Displacement = 50 metres
The direction of the displacement will be northward.
While the distance will be:
Distance = 32 + 6 + 24 = 62 metres
Lee is traveling in a train moving at a constant velocity of 35 m/s to the east. If Lee is seated on the train and staring at the seat directly in front of him, how fast does the seat in front of Lee appear to be moving relative to Lee?
Answer:
0 m/s or stationary
The seat in front of Lee appear to be at rest
Explanation:
When the motion of a person or object is found by comparing the person or objects motion with regards to a stationary object or an object in motion, the result is the relative motion of the person or object to the stationary or moving object
In the question, Lee is comparing the motion of the chair in front of him with regards to the motion of the chair he his sitting on.
The speed of both chairs are the same as the speed of the train in which they are attached.
Therefore, as the seats are fixed relative to each other such that there is no change in their relative position and therefore, no or 0 m/s relative velocity with each other.
A farmers field , which are close to a stream has experienced a lot of runoff. One possible effect of the run off is that the stream will have a decreased level of fertilizers from the field
Answer:
This statement is false.
Explanation:
If the farmers field is close to the stream, and has experienced a lot of runoff, the runoff will carry chemicals from the farm into the stream, which includes fertilizers among other chemicals. This runoff into the stream will not lead to a decrease in the level of fertilizers in the stream. Therefore, one of the effect of this cannot be a decrease in the level of fertilizers from the field.
Experiment Question: How does temperature affect the air (gas) inside a balloon? Please help it's just the hypothesis I need help in. Also, this is NOT physics, it's SCIENCE!! (I couldn't find science, but yeah)
Answer:
I think when the balloon is heated up the gas will expand making the balloon bigger. When things are heated up the molecules will get excited and expand. When they balloon is cooled then the it will retract.
Hope this helps! :)
Pls help
Qn 9,10,11
Qn 11
Answers,
a) 10g/cm3
b) 20g/cm3
c) 30g/cm3
d) 40g/cm3
Answer:
Q no. 9: a
Q no. 10: d
Q no. 11: b
potential energy is sometimes called?
Answer:
it can be called PE or sometimes, there are equations which you can use the letter U.
Explanation:
Answer:
STORED ENERGY
Explanation:
Acceleration is the change of velocity over some
time. Is it true or false
i will give brainliest Which of the following structures are present in plant cells but absent in animal cells? Choose 1 answer: (Choice A) A Cell walls (Choice B) B Mitochondria (Choice C) C Cytosol (Choice D) D Golgi bodies
Answer:
A. cell walls
Explanation:
Plants have cell walls but animals dont.
How many atoms of oxygen in the chemical fomula 2ca(cio2)2?
Explanation:
there are 8 atoms of oxygen
What is the following correct way to write 2,330,000 In a scientific notation
Answer:
2.33 × 10^6
hope this helps.
Answer:
2.33 x 106
Explanation:
it is right promise