Answer:
A.) 1430 metres
B.) 80 seconds
Explanation:
Given that the train accelerates from rest at 1.1m/s^2 for 20s. The initial velocity U will be:
U = acceleration × time
U = 1.1 × 20 = 22 m/s
It then proceeds at constant speed for 1100 m
Then, time t will be
Time = distance/ velocity
Time = 1100/22
Time = 50 s
before slowing down at 2.2m/s^2 until it stops at the station.
Deceleration = velocity/time
2.2 = 22/t
t = 22/2.2
t = 10s
Using area under the graph, the distance between the two stations will be :
(1/2 × 22 × 20) + 1100 + (1/2 × 22 × 10)
220 + 1100 + 110
1430 m
The time taken between the two stations will be
20 + 50 + 10 = 80 seconds
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
How many atoms of oxygen in the chemical fomula 2ca(cio2)2?
Explanation:
there are 8 atoms of oxygen
What forces come in pairs?
Answer:
Newton's Third Law of Motion
Explanation:
it explains that forces always come in action-reaction pairs. The Third Law states that for every action force, there is an equal and opposite reaction force
Answer:
newtons third law of motion
Explanation:
newtons third law of motion explains that forces always come in action-reaction pairs
a student places a 13 gram piece of quartz in a graduated cylinder. the water level rises from 30mL to 35mL. what is the density of the quartz
Answer:
2.6 g/cubic centimeter
Explanation:
Given :
Weight of the quartz = 13 gram
Original level of water = 30mL
Level of water after quartz was is placed inside the cylinder = 35 mL
Therefore rise in water = 35 - 30 = 5 mL
We known that 1 mL = 1 cubic centimeter
And density = mass / volume
Therefore, density of the quartz is = 13/5
= 2.6 g/ cubic centimeter
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.
A plane flies for 2 hours at a speed of 430 km/hr. How far did the plane travel?
Answer:
860km
Explanation:
2× 430 = 860km
the rate is 430km per hr. 2 hours means you multiply by 2
Newton's Laws of Motion and Newton's Law of Gravity explain why?
a) the Earth moves around (orbits) the Sun.
b) the Moon moves around Earth
c) an apple from a tree falls down to ground (as opposed to "rising up into the sky")
d) all of the above
Answer:
D all of the above
Explanation:
This is because newtons laws of motion explains movement of a body due to a force applied while that of gravity explains motion of a body under gravity and this captures a, b, and c
All the given options are following the Newton's laws of motion and Newton's law of gravity separately. All of the above options are correct. Hence, option (d) is correct.
The given problem is based upon the Newton's law of motion as well as Newton's law of gravity. So let us analyze each of the given cases as:
(a)
The Earth moves around the Sun : This statement follows the Newton's first law of motion, which says that an object will continue its state of motion, until any external force is being applied on the object. Since, Earth is offered with no net force. Therefore, Newton's law is applicable.
(b)
Moon movers around Earth: This statement also follows the above explanation for the Newton's first law. Which makes moon to revolve around the Earth on an account of no net force. Hence, it will continue its circular motion and hence Newton's law of motion is followed.
(c)
An apple falls from a tree: This statement is based on Newton's law of gravity, which says that every particle in the universe attracts other particles such that the force of attraction is directly proportional to the product of their masses and inversely proportional to square of distance between them. Since, Earth has more mass than apply, therefore Earth will attract the apple downwards.
Thus, we can conclude that all the given options are following the Newton's laws of motion and Newton's law of gravity separately. All of the above options are correct. Hence, option (d) is correct.
Learn more about the Newton's laws of motion here:
https://brainly.com/question/17366362
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.
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 does this explain the action of a bullet fired from a gun.
Answer:
When a bullet is fired from a gun, the gun exerts a force on the bullet in the forward direction. This is force is called as the action force. The bullet also exerts an equal and opposite force on the gun in the backward direction. Therefore a gun recoils when a bullet is fired from it.
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:
does increase in length affect period T?
Yes,increase in length affects period T.
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:
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:
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:
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! :)
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:
Which of the following is an example of a chemical property? Density Solubility Flammability Magnetism
Answer:
Flammability.
Explanation:
I took the test.
Acceleration is the change of velocity over some
time. Is it true or false
There are two cars moving at a constant speed. Car A is moving constantly at 5 m/s on a straight path. Car B is moving constantly at 5 m/s on a path with a deep curve. In which driving situation is the car demonstrating acceleration.
Answer:
The car moving with constant speed on the path with a deep curve experiences an acceleration towards the center of the curve.
Explanation:
Acceleration is the rate of change of velocity with time. A velocity has both magnitude and direction, and a change in either or both of the magnitude and the direction can produce an acceleration on the car. The car on the curved path experiences a change in the direction of travel along the path. This changes in direction at every point on the curve puts an acceleration on the car towards the center of the curve.
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.
An object moves, along a line,from point A to B to C and then back to B
again as shown in the figure below in half an hour.
a) find the average speed of the moving object in km/hr.
b) find the magnitude of the average velocity of the object in km/hr
help me pleaseddddd!!!
Answer:
a). Average speed = 26 km per hour
b). Average velocity = 10 km per hour
Explanation:
a). Distance between A to B = 5 km
Distance between B to C = 4 km
Total distance traveled between A to B to C and then back to B
= 5 + 4 + 4
= 13 km
Time taken to cover this distance of 13 km = [tex]\frac{1}{2}[/tex] an hour
Therefore, average speed during this trip = [tex]\frac{13}{\frac{1}{2}}[/tex]
= 26 km per hour
b). Average velocity = [tex]\frac{\text{Displacement}}{\text{Duration}}[/tex]
Displacement = (Distance between A to B) + (Distance traveled between B to C) - (Distance traveled from C to B)
= 5 + 4 - 4
= 5 km towards A
Average velocity = [tex]\frac{5}{\frac{1}{2}}[/tex]
= 10 km per hour
mark as brain list answer
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
it is strong elastic and light .it is lutrous and easy to wash. so it become very popular for making clothes
Answer:
Nylon fibres
Explanation:
Nylon fibres are synthetic polymers made of repeating units linked by amide links. It is a thermoplastic silky material which can be remoulded in any shape.
Nylon fibres have the property of strong elastic and light in weight that is why used for making ropes, combat uniforms, and parachutes. Nylon Fibres are also lustrous and easy to wash so widely used in textile industry for making swimwear, track pants, shorts, and draperies.
Hence, the correct answer is "Nylon fibres".
7.
You run from your house to a friend's house that is 3 miles away. You then walk home.
Answer:
whats the question??????
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 :)
this is how Florine appears in the periodic table. which is one best piece of information that "9" gives about an atom of florine? atomic mass is different than atomic number, and the number of neutrons is the difference between the atomic mass and the atomic number.
Answer:
9 is the number of protons in the fluorine atom (atomic number)
Explanation:
Answer:
Atomic number
Explanation:
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
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I. Net force: 50 Resultant motion: right
ItsOniiSama avatar
J. NET FORCE: 75 Resultant motion: down
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K. Net force :200 Resultant motion: Right
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L. Net force: 0 resultant motion:No motion
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
if the
D=19.3g/cm^3
v= 1.61 cm^3 what is the mass
Answer:
Mass=DV
=19.3g/cm^3 ×1.61cm^3
=31.266g
Explanation:
Mass is the product of an objects density and the space it occupies (volume)