Answer:Three elements make up over 99.9 percent of the composition of dry air: these are nitrogen, oxygen, and argon.
Explanation:
Answer: Air is an gaseous substance
Explanation:
Air is a homogeneous mixture of the gaseous substances nitrogen, oxygen, and smaller amounts of other substances. Salt, sugar, and many other substances dissolve in water to form homogeneous mixtures.
A car accelerates from rest at a stop sign at a rate of 3.0 m/s^2 to a speed of 21.0 m/s, and then immediately begins to decelerate to a stop at the next stop sign at a rate of 4.0 m/s^2. How long did it take the car to travel from the first stop sign to the second stop sign? Show your work.
Answer:
t = 12.25 s
Explanation:
First we calculate the time taken by the car during accelerating motion, we use 1st equation of motion:
Vf = Vi + at₁
where,
Vf = Final Velocity = 21 m/s
Vi = Initial Velocity = 0 m/s
a = acceleration = 3 m/s²
t₁ = time taken during acceleration = ?
Therefore,
21 m/s = 0 m/s + (3 m/s²)t₁
t₁ = (21 m/s)/(3 m/s²)
t₁ = 7 s
Now, we use the same equation to find out the time taken during deceleration motion, with following data:
Vf = Final Velocity = 0 m/s
Vi = Initial Velocity = 21 m/s
a = deceleration = -4 m/s²
t₂ = time taken during deceleration = ?
Therefore,
0 m/s = 21 m/s + (-4 m/s²)t₂
t₂ = (-21 m/s)/(-4 m/s²)
t₂ = 5.25 s
Therefore, the total time taken by the car to travel from first stop sign to second stop sign is:
t = t₁ + t₂
t = 7 s + 5.25 s
t = 12.25 s
Answer:
12.25s
Explanation:
8. An airplane heading to Paris from Houston travels 5000 miles at 500 mph. How long will it take the airplane to get to Paris?
Answer:
10 hours to get to Paris
A runner moves west with an initial velocity of 4 m/s. She accelerates 3 m/s2 for 30 seconds. The runner’s final velocity is?
Hello! The answer to this would be 94m/s3 I believe. I’m not for sure with the units but in order to find the answer, you would need to use the equation Vf=VI+(a x t) you would plug in the numbers, so in you case you would plug in, Vf= 4m/s +(3m/s2 x 30s) and you would get solve. I’m so sorry that I’m not certain with the units but I hope this helps you understand! Good luck :)
Her final velocity is 94 m/s West, and her legs are all blurry because she is running at a little bit over 210 mph. Bet she can't keep that up for too long.
What is your understanding of science?
Answer:Science is a method of learning things about the world and environment we live in today . It gives us a better understanding of the natural world and how it works
Explanation:
Kinetic energy depends on the height of an object above the ground?
what’s 55mph to km/min? can someone explain to to me with the work so i can understand how to solve this
Please help with these physics problems 1. A soccer ball is dropped from the top of a building. It takes 5.8 seconds to fall to the ground. The height of the building is...? 2. The Falcon 9 launches to a height of 123 meters. What is its vertical initial velocity? 3. An apple falls from rest off a 10.m m tree. How long will it take before it hits the ground?
Answer:
1.) h = 164.8 m
2.) U = 49.1 m/s
3.) t = 1.43 seconds
Explanation:
1.) A soccer ball is dropped from the top of a building. It takes 5.8 seconds to fall to the ground. The height of the building is...?
Since the soccer ball is dropped from the building, the initial velocity U will be equal to zero
Using second equation of motion
h = Ut + 1/2gt^2
Substitutes the time into the formula
h = 1/2 × 9.8 × 5.8^2
h = 164.8 m
2. The Falcon 9 launches to a height of 123 meters. What is its vertical initial velocity?
At maximum height final velocity = 0
Using the third law of motion
V^2 = U^2 - 2gH
0 = U^2 - 2 × 9.8 × 123
U^2 = 2410.8
U = 49.1 m/s
3. An apple falls from rest off a 10.m m tree. How long will it take before it hits the ground?
Since the apple fall from rest, the initial velocity U will be equal to zero
Using the second equation of motion,
h = Ut + 1/2gt^2
substitute all the parameters into the formula
10 = 1/2 × 9.8 × t^2
10 = 4.9t^2
t^2 = 10/4.9
t^2 = 2.04
t = 1.43 seconds
If an athlete completes a cycle around a circular track, his displacement eauals to ZERO.
O True
O False
The statement is TRUE.
"Displacement" means the distance and direction from the start-point to the end-point, NO MATTER how you got there.
If you go out cycling and go back home when you're done, your displacement is zero. it doesn't matter how far you cycled, or what streets or woods you cycled through, or whether your route was a circle, a square, an ellipse, a triangle, or a jumble, or whether you cycled around and around the same path 27 times. You ended right where you started. The distance from your start-point to your end-point is zero, so your displacement is zero.
Drag the tiles to the correct boxes to complete the pairs.
Match the following astronomers to their contributions.
Galileo Galilei
Albert Einstein
Henrietta Swan Leavitt
Edwin Hubble
Georges Lemaître
theorized that the universe had a beginning
showed that the universe was expanding
demonstrated a method to calculate the distance of celestial bodies
was the first to use a telescope to observe the planets
huit a model of the inverse haced on relativity
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Answer:
Georges Lemaître - theorized that the universe had a beginning
Albert Einstein - huit a model of the inverse haced on relativity
Galileo Galilei - was the first to use a telescope to observe the planets
Edwin Hubble - showed that the universe was expanding
Henrietta Swan Leavitt - demonstrated a method to calculate the distance of celestial bodies
is my choices report if wrong
Galileo Galilei was the first to use a telescope to observe the planets
Albert Einstein built a model of the universe based on relativity
Henrietta Swan Leavitt demonstrated a method to calculate the distance of celestial bodies
Edwin Hubble showed that the universe was expanding
Georges Lemaître theorized that the universe had a beginning
What is science?Science is the methodical, empirically-based pursuit and application of knowledge and understanding of the natural and social worlds.
A method of learning about the world is science. Science allows people to participate in the creation of new knowledge as well as use that knowledge to further their goals. It is both a process, a product, and an institution.
Thus, The first person to observe the planets through a telescope was Galileo Galilei.
Based on relativity, Albert Einstein created a model of the universe.
A technique to determine the separation between celestial bodies was demonstrated by Henrietta Swan Leavitt.
Edwin Hubble demonstrated the expansion of the universe
According to Georges Lemaître, the universe had a beginning.
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scientific theories cannot change once they've been written down true or false
Answer:
Yes
Explanation:
Answer: false
a theory is just an idea, so it can be changed, while a scientific fact is true and wont be changed
A ball rolls at a speed of 6cm/s. How far does the ball roll in 40 seconds ? ____cm
Answer:
240cm
Explanation:
Speed = 6cm/s
Time = 40 seconds
Speed= distance/time
6cm/s = distance/40seconds
Distance = 6×40
Distance = 240cm
Hence, in 40 seconds, the ball must have rolled the distance of 240cm
an object of mass 8 kg is wild around rapidly in a vertical circle of radius 2 metres with constant speed of 6 m per second calculate the maximum tension in the string
Answer:
[tex] \boxed{\sf Maximum \ tension \ (T_{max}) = 224 \ N} [/tex]
Given:
Mass (m) = 8 kg
Constant speed (v) = 6 m/s
Radius of vertical circle (r) = 2 m
Accelration due gravity (g) = 10 m/s²
To Find:
Maximum tension in the string ([tex] \sf T_{max} [/tex])
Explanation:
As the object is moving in a vertical circular path. So, the maximum tension on the string is when the body will be on its lowest position because at that point centrifugal force and force due to gravity both will act on the body in same direction.
So,
Maximum tension ([tex] \sf T_{max} [/tex]) is the string will be equal to centrifugal force ([tex] \sf F_c [/tex]) + Force due to gravity.
[tex] \boxed{ \bold{ T_{max} = F_c + mg= \frac{m {v}^{2} }{r} + mg }}[/tex]
Substituting value of m, v, r & g in the equation:
[tex] \sf \implies T_{max} = \frac{8 \times {6}^{2} }{2} + 8 \times 10 \\ \\ \sf \implies T_{max} = \frac{8 \times 36}{2} + 80 \\ \\ \sf \implies T_{max} = \frac{8 \times 36}{2} + 80 \\ \\ \sf \implies T_{max} = \frac{288}{2} + 80 \\ \\ \sf \implies T_{max} = 144 + 80 \\ \\ \sf \implies T_{max} = 224 \: N [/tex]
[tex] \therefore[/tex]
Maximum tension in the string (T) = 224 N
draw a labelled ray diagram to locate the image of an object formed by a convex lens of focal length 20cm when the object is placed at 30 cm away from the lens
Focal length of convex lens is taken positive.
[tex]:\implies\sf\:\dfrac{1}{v}-\dfrac{1}{u}=\dfrac{1}{f}[/tex]
[tex]:\implies\sf\:\dfrac{1}{v}-\dfrac{1}{(-30)}=\dfrac{1}{20}[/tex]
[tex]:\implies\sf\:\dfrac{1}{v}=\dfrac{1}{20}-\dfrac{1}{30}[/tex]
[tex]:\implies\sf\:\dfrac{1}{v}=\dfrac{3-2}{60}[/tex]
[tex]:\implies\:\boxed{\bf{\gray{v=60\:cm}}}[/tex]
Hurry!! Physical science
Answer:
time stirred and amount of water
all of the answers are true
Answer:
All are True
Explanation:
Energy is both coming and leaving and so on.
compare mass and weight
Answer:
The mass of an object is a measure of the object's inertial property, or the amount of matter it contains. The weight of an object is a measure of the force exerted on the object by gravity, or the force needed to support it. The pull of gravity on the earth gives an object a downward acceleration of about 9.8 m/s2.
Please select the word from the list that best fits the definition I study French so I can talk to my cousin who lives in Paris
Answer: intrinsic
Explanation: i hope this helps :)
Answer:intrinsic
Explanation: edge 2023
A light-rail train going from one station to the next on a straight section of track accelerates from rest at 1.1m/s^2 for 20s. It then proceeds at constant speed for 1100 m before slowing down at 2.2m/s^2 until it stops at the station. a. What is the distance between the stations? b. How much time does it take the train to go between the stations?
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
Star meaning plz :) I need help
which process must occur for clouds to form?
The phenomenon is called as condensation in which the water droplets combine together to form clouds. So, the correct option is D.
What is Condensation?Condensation is defined as the change of state of matter from the gas phase to the liquid phase, and is the reverse of evaporation which often refers to the water cycle.
Condensation is described as the process where water vapor becomes liquid which is the opposite of evaporation, where liquid water becomes vapor. Condensation happens in one of two ways which are as follows: either the air cools to its dew point or it becomes so saturated with water vapor that it cannot hold any more water.
Thus, the phenomenon is called as condensation in which the water droplets combine together to form clouds. So, the correct option is D.
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Your question is incomplete, most probably the complete question is :
Which process must occur for clouds to form?
(1) conduction (2)erosion (3) precipitation (4) condensation
Which image shows a molecular model? Images are shown bellow:
Answer:
The 3rd image
Explanation:
I chose that because that's what I learned in biology
which of the following has a particles in most irregular pattern
Available Options Are:
A.SALT
B.STONE
C.GHEE
D.SPONGE
Answer:
Option A. Salt
Explanation:
The reason is that the all of the grains of salt are not in a unified shape. Some of these have large shape, some has small shape and the best think is that their shape doesn't resemble with each other. This is also because that the salt includes many other ingrediants that form part of the grain. Hence Salt is the correct Option.
Stone has a unified pattern shape hence it doesn't have irregular pattern.
Ghee also has unified shape pattern due to one compound existence and also because of liquid particles that has highest rate of reqular patterns.
Sponge is a compound product and has one compound existence thus the pattern of the particles will be regular.
3. Mary Lou is running errands for her mother. She leaves her house and goes 1 mile north to the
bakery. She then goes 2.5 miles south to get her hair cut. She continues south for 1.5 miles to
check out a book from the library. She then goes 0.75 miles north to meet a friend. This entire
voyage lasts 3 hours.
a) What is the total distance traveled? 6
b) What is the total displacemen 7
c) What was her average speed?
8
d) What was her average velocity
Answer:
Explanation:
a) The total distance travelled by Mary will be addition of the distances travelled in all directions.
Total distance travelled = 1 mile + 2.5 mile + 1.5miles + 0.75 miles
Total distance travelled = 5.75 miles
Hence the total distance traveled by Mary in her entire journey is 5.75 miles
b) Displacement is the total distance travelled in a specified direction. The displacement = 2.5 miles + (1.5- 0.75) miles = 3.25 miles
c) Speed is the change in distance with respect to time.
Speed = distance/time
Speed = 5.75/30
Speed = 0.193mi/hr
d) Average velocity is the change in displacement with respect to time.
Velocity = displacement/time
Velocity = 3.750/30
Velocity = 0.125mi/hr
under what condition to a feather and an iron ball fall at the same rate? Explain with reason.
Answer:when the body is in vaccum
Explanation:when the body is in vaccum both of the body falls simultaneously due to the absence of air
When a student stands on a rotating table,the frictional force exerted on the student by the table is?
Answer:
Less
Explanation:
because static friction is more than rolling friction
how does diffusion support the idea that matter is made up of particles
Explanation:
because when diffusion occurs it is as a result of the particles moving around freely in open space
The fact that matter is composed of particles and that these particles are incredibly tiny and have space between them supports the theory that matter is composed of particles.
What is diffusion?The mixing of materials is caused by the free movement of their particles is known as diffusion.
Even with a strong microscope, the substance is composed of microscopic particles that cannot be seen. The matter is anything that is both mass- and space-having. Small particles make up matter.
Because the particle's unrestricted movement in an open environment causes diffusion to happen.
Hence, diffusion supports the idea that matter is made up of particles.
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Henry was giving the school toy for his birthday he can use it to tell how fast someone is moving at the moment in time the toy miss calculate the persons
Answer:
The toy must calculate the person's speed/velocity
Explanation:
Since the school toy given to Henry can be used to tell how fast someone is moving, the toy must be able to calculate the person's speed/velocity using the average distance covered by the person divided by time taken to cover the distance; average distance ÷ time taken.
The toy must be able to determine the parameters (average distance and time taken) in order to be able to calculate the person's speed/velocity
What’s 2.3 miles into kilometers
Answer:
3.70149
Explanation:
What are the benefits of vitamin K
Answer:Vitamin K is an important factor in bone health and wound healing. Vitamin K is a fat-soluble vitamin that makes proteins for healthy bones and normal blood clotting. According to the Harvard School of Public Health, vitamin K helps produce four of the 13 proteins needed for blood clotting.
Explanation:
a bee travels 7.6 m in 38 seconds. what is it’s velocity?
Answer:
Velocity=0.2m/s
Explanation:
Velocity=displacement / time
Velocity=7.6m/38s
Velocity=0.2m/s
What kind of work is done when water is pulled from a well?
Answer:
this is the answer for the question and i hope it will help
Answer:It is pull force:it takes our force
The work which is done is very hard