Answer:
The value is [tex]C = 21.07 ppm[/tex]
Explanation:
From the question we are told that
The volume of the first aliquot is [tex]V_a1 = 25.0 \ mL[/tex]
The volume after dilution is [tex]V_A = 50.0mL[/tex]
The Absorbance of the first solution is [tex]A_1 = 0.656[/tex]
The wavelength at which the absorbance occurred is [tex]\lambda _1 = 348 nm = 348*10^{-9} \ m[/tex]
The length of the cell [tex]l = 2.50 \ cm[/tex]
The volume the second aliquot is [tex]V_{a2} = 25.0 \ mL[/tex]
The volume of the solution it was mixed with is [tex]V_s = 10.00mL[/tex]
The concentration of quinine in the 10 mL solution [tex]Z = 25.7ppm[/tex]
The volume of the second solution after dilution is [tex]V_d = 50.0 mL[/tex]
The absorbance of the second solution is [tex]A_2 = 0.976[/tex]
Generally the concentration of quinine is mathematically represented as
[tex]C = \frac{A_1 *Z * V_s }{(A_2 -A_1) V_{a2}}[/tex]
=> [tex]C = \frac{ 0.656 * 25.7 * 10.0}{ (0.976 - 0.656) * 25}[/tex]
=> [tex]C = 21.07 ppm[/tex]
The value of atmospheric pressure at sea level
Answer:101.325 kilopascals
Explanation:
differences differences between gravity and acceleration due to gravity
Look at this table. Accleration of gravity means gravitational constant.
Which of the following is an example of a projectile? A Dropped ball B. Airplane C Missile D. Bird
I guess a missile?
A bird is not a projectile, a ball isn't really, and an airplane isn't, so, yeah.
?:]
what acceleration of a 45 kg mass pushed with 15 N of force?
Explanation:
Fnet = ma.
Assume that there is no resistance acting on the mass. Therefore a = 15N / 45kg = 0.33N/kg or 0.33m/s^2.
How many nanoCoulombs are there in a milliCoulomb
Answer:
1 millicoulomb = 1000000 nanocoulombs.
Explanation:
The SI unit for electric charge is Coulomb.
1 coulomb = 1000000000 nC (nanocoulombs)
1 coulomb = 1000 mC (millicoulombs)
describe the motion of an object has an acceleration of 0 m/s2
Answer:
The object is either traveling at a constant speed or is not moving.Explanation:
It is not possible for the position of an object to be changing and the acceleration to be zero. Acceleration is the change in velocity divided by the change in time.There are only two possible situations if the motion of an object has an acceleration of 0 m/s²,
Either the object is at rest or the object is moving at a uniform velocity
What is acceleration?The rate of change of the velocity with respect to time is known as the acceleration of the object. Generally, the unit of acceleration is considered as meter/seconds².
As we know the rate of change of velocity is known as acceleration
acceleration =change in velocity/change in time
As given in the problem statement the motion of an object has an acceleration of 0 m/s²
Considering that every moving particle has zero overall acceleration. The particle will then experience zero overall applied force.
Newton's first law states that if all forces acting on a moving object are equal to zero, the object will be traveling in a straight line at a constant speed.
When there is no acceleration, the particle's motion will continue in the same direction. Additionally, the particle's velocity will not remain constant if the direction of motion changes.
Thus, If an object's motion has an acceleration of 0 m/s², there are only two possible outcomes: either the object is at rest or it is moving at a constant speed.
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Which is one piece of information that astronomers use to calculate the age of the universe?
Answer:
the age of the oldest stars patterns of background radiation how fast distant galaxies are moving away from usExplanation:
According to the NASA, astronomers can estimate how old the universe is by comparing the age of the oldest stars and the rate of expansion of the universe. The rate of expansion of the universe is based on the Big Bang theory and it states that our universe is continuously expanding since it first developed. Astronomers measure Cosmic Microwave Background radiation resulting from the Big Bang.
Answer:
Patterns of background radiation
Explanation: well astronomy states that they are able to tell by the radiation gaps
Which of the following is true of the structures labeled A in the cell membrane?
Choose 1 answer:
(Choice A) A They are membrane proteins.
(Choice B) B They are entirely hydrophobic.
(Choice C) C They are phospholipids.
(Choice D) D They are carbohydrates.
Answer: a, they are membrane proteins
Explanation:
Awnser A is the correct awnser
Write a explanation explaining why red is a beautiful color is not a hypothesis
Answer:
Please find the explanation below
Explanation:
A hypothesis in science is a testable explanation that is yet to be tested via experimentation. It is a predictive statement or suggested solution to an observation. A hypothesis aims at finding a possible explanation/answer to a question, which is subject to testing. One important aspect of formulating a hypothesis is that it tends to connect the independent variable with the dependent/measurable variable.
The statement "RED IS A BEAUTIFUL COLOR" cannot be considered a hypothesis because it does not aim to answer a question that can undergo experimental testing. This statement can not be measured via experimentation. The statement is not a possible answer to a question but rather a personal opinion about something.
If multiple measurements are taken and they vary quite a bit from each other, the measurements are
Answer:
precise
Explanation:
usatestprep
The degree of agreement between two or more measurements is what is referred to as a substance's precision. Your measurement is incredibly exact, but not necessarily correct if you weigh the same substance five times and obtain 3.2 kg each time.
What precision vary quite a bit from each other?The level of agreement between measurements of the same thing is known as precision. Accuracy is not necessary for precision. In other words, it is possible to be accurate without being exact, as well as to be highly precise but not particularly accurate.
As was mentioned before, you can be extremely exact but inaccurate. You can also be precise while being inaccurate. For instance, you have accuracy without precision if, on average, your measurements for a specific substance are close to the known value, but the measurements are far apart.
Therefore, The standard deviation, or the amount and frequency of measurement variation, is what determines precision. A high standard deviation indicates low precision, according to the metric.
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8. Do you need to show your work on ANY problem that requires a calculation to receive full credit?
Yes
No
Answer:
Yes
Explanation:
Jennifer, who has a mass of 50.0 kg, is riding at 35.0 m/s in her red sports car when she must suddenly slam on the brakes to avoid hitting a deer crossing the road. She strikes the air bag, that brings her body to a stop in 0.500 s. What average force does the seat belt exert on her
Answer:
Average force = 3.5 kN
Explanation:
Given:
Mass of Jennifer (m) = 50 kg
Initial velocity = 35 m/s
Time taken to stop body = 0.5 s
Find:
Average force
Computation:
v = u + at
0 = 35 + a(0.5)
Acceleration (a) = - 70 m/s² = 70 m/s²
Average force = ma
Average force = (50(70)
Average force = 3500 N
Average force = 3.5 kN
Marissa is an extremely curious sixth grader. During a snow day she looked out her window and saw a truck spreading something all over the road. After the truck went past Marissa's house, she had a snack, put on her snow boots, hat, coat and gloves and went outside to play. She walked over to the edge of her driveway and observed salt all over the roadway, but not the sidewalks or her driveway. She also observed some of the snow and ice had melted off the roadway but not her driveway or sidewalks. She wondered if the ice and snow melting was due to the salt?
Answer:yes
Explanation:
ice melter because it causes freezing point depression.This means that salt helps in lowering the freezing point.
A remote-controlled, pilot-operated ___ valve is type of pilot-operated relief valve that uses one or more external pilot valves to set the pressure at which the relief valve will open.
Answer:
A remote-controlled, pilot-operated _Relief__ valve is type of pilot-operated relief valve that uses one or more external pilot valves to set the pressure at which the relief valve will open.
In terms of matter and resources, Earth is essentially a(n) ________ system ; in terms of energy, Earth is a(n) ________ system.
Answer:
b
Explanation:
Must be 8 letters (Dimensional Analysis escape room)
Answer: A-B-C-E-G-K-H-I
Explanation:
Ok, we start at A.
16 pints = x gallons.
We know that:
1 pint = 0.125 al
then:
16pint = 16*(0.125gal) = 2 gal.
The second letter is B.
Now we have:
12,320 yd = X mi
And we know that:
1 mi = 1760 yd.
Then 12,320yd = (12,320/1760) mi = 7mi
the letter is C.
Now we have:
432 cups = X gals
and:
1 cup = 0.0625 gal
then 432 cups = 432*(0.0625 gal) = 27 gal.
The next letter is E.
Now we have:
1/4 ton = X pounds.
And 1 ton = 2000 pounds
then 1/4 ton = (1/4)*2000 pounds = 500 pounds
The next letter is G.
Now we have:
3.5 gal = X ounces.
and we know that:
1 gal = 128 oz
Then:
3.5 gal = 3.5*(128oz) = 448oz
The next letter is K.
Now we have:
1/2 day = x minutes.
and we know that:
1 day = 24*60 min = 1440 min
then 1/2 day = (1/2)*1440 min = 720 min.
The next letter is H.
Now we have:
360 in = x yd
And we know that:
1yd = 36 inches.
then 360 in = (360/36) = 10 yd.
The next letter is I
Now we have:
56 cups = x quarts.
and we know that;
1cup = 0.25 quart
then: 56 cups = 56*0.25 quart = 14
So here this ends.
Then the code is:
A-B-C-E-G-K-H-I
Examples of increase in pressure due to increase in applied force
Answer:
injecting
Explanation:
What is the kinetic energy of a 7.56 kg bowling ball that is rolling at a speed of 2 m/s ?
Answer:
K.E=?
Mass=7.56 kg
Velocity=2m/s
Solution::
K.E = 1/2mv^2
K.E=0.5*7.56*(2)^2
K.E= 0.5*7.56*4
K.E=15.12 joules.
It takes a person 22 seconds to swim in a straight line from the south end of the pool to the north end of the pool a distance of 28 meters. What is the swimmers velocity? A. 0.8 m/s south b. 1.3 m/s north C. 1.3 m/s north D. 0.8 me north
Answer:1.3 m/s north
Explanation:
just did it on apex
A long distance runner sees the finish line and accelerates at a rate in 1.2 m/s2 for
the last 3 seconds to win the race. If he was initially running at speed of 3.2 m/s,
how far did he travel?
Answer: he did travel 15 meters.
Explanation:
We have the data:
Acceleration = a = 1.2 m/s^2
Time lapes = 3 seconds
Initial speed = 3.2 m/s.
Then we start writing the acceleration:
a(t) = 1.2 m/s^2
now for the velocity, we integrate over time:
v(t) = (1.2 m/s^2)*t + v0
with v0 = 3.2 m/s
v(t) = (1.2 m/s^2)*t + 3.2 m/s
For the position, we integrate again.
p(t) = (1/2)*(1.2 m/s^2)*t^2 + 3.2m/s*t + p0
Because we want to know the displacementin those 3 seconds ( p(3s) - p(0s)) we can use p0 = 0m
Then the displacement at t = 3s will be equal to p(3s).
p(3s) = (1/2)*(1.2 m/s^2)*(3s)^2 + 3.2m/s*3s = 15m
what oversimplified assumption does the graph make about number of types of products the society produces?
Answer:
CAN'T UNDERSTAND YOUR QUERY
Explanation:
What is your qurey. plz explain properly.
which formula gives the value of velocity ratio of wheel and axle?
Answer:
measurement of force amplification
Neglecting air resistance, which of the following statements is true regarding an object in freefall?Lector inmersivo A. An object’s acceleration increases at a constant rate. B. An object maintains a constant velocity. C. An object falls an equal distance in between each second. D. An object’s velocity and acceleration both increase at a constant rate. E. An object’s velocity changes at a constant rate, and its acceleration remains constant.
Answer:
E. An object’s velocity changes at a constant rate, and its acceleration remains constant.
Explanation:
When an object is in freefall, it implies that the object is falling freely under gravity. If it falls towards the earth surface, the fall is in the direction of the Earth's gravitational force.
At the point of release of the object, its initial velocity is zero because it is at rest. But when released, its velocity increases at a constant rate until it is acted upon by an external force. But its acceleration remains constant, acceleration due to gravity.
A new born baby weights 7.15 lbs how many meters is that
Answer: 114.543 i think
Describe the abiotic factors that are essential for your organism to survive
Answer:
Abiotic factors include water, sunlight, oxygen, soil and temperature. Water (H²0) is a very important abiotic factor - it is often said that "water is life." All living organisms need water. Plants must have water to grow.... Without the sun, plants could not live, and without plants, animals could not live!
Explanation:
*Hope this helps*
Which characteristic is shared by extrusions, intrusions, and faults?
O
All are cracks.
All are igneous rocks.
O All cause gaps in the geologic record.
All are younger than surrounding rocks.
Answer:D
Explanation:
The characteristic shared by extrusions, intrusions, and faults is all are younger than surrounding rocks.
The correct option is fourth.
What is extrusion?Extrusion is a process of extruding.
Intrusion is the process of intruding. The forced entry of molten rock or magma into two different rock formations. It is also the intruded magma.
The movement of magma over the surface of the Earth coming out through volcano craters and cracking in the earth's crust forms igneous rock.
The characteristic shared by extrusions, intrusions, and faults is all are younger than surrounding rocks.
The surrounding rocks are already present. After that the entry of magma occurs which forms new rock. So, in age surrounding rocks are older than the middle.
Thus, the correct option is fourth.
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A 300 g walking stick is placed on a pivot and balanced by a 100 g mass, as shown in
Figure 5.20. Calculate the distance of the centre of gravity of the stick from the pivot.
Answer:
Purplemath
The first term in the binomial is "x2", the second term in "3", and the power n is 6, so, counting ... x12 + 18x10 + 135x8 + 540x6 + 1215x4 + 1458x2 + 729 ... So memorize the Theorem and get the easy points.
Answer:
the distance of the center of gravity of the stick from
Δ = 5 cm to make it equilibrium or balance.
Explanation:
100 g
______Π___________________________________)
|<--- 15-----Δ--- x--->|
weight of stick (w) = 300 g acting on center with x distance from support Δ.
to get the x distance to make stick and a block balance, take moment from support.
ΣM at Δ = 0
0 = 100 (15) - 300(x)
0 = 1500 - 300x
300x = 1500
x = 1500 / 300
x = 5
therefore, the distance of the center of gravity of the stick from Δ = 5 cm
to make it equilibrium or balance.
Which of the following is an example of technology influencing science?
A.Use of recording devices to view the growth of plants.
B.Use of X-ray machines for airport security.
C.Invention of the microscope to observe cells.
D.Invention of the thermometer to measure heat.
Answer:A and C
Explanation:
Answer:
a
Explanation:
what is the dot product and cross product of of two vectors if the angle is between them is 90 degree?
[tex]\sf{\pink{\underline{\underline{\blue{GIVEN:-}}}}}[/tex]
The angle between the two vectors is 90° .[tex]\sf{\pink{\underline{\underline{\blue{TO\: FIND:-}}}}}[/tex]
The dot product of two vectors .The cross product of two vectors .[tex]\sf{\pink{\underline{\underline{\blue{SOLUTION:-}}}}}[/tex]
⚡ Let [tex]\rm{\vec{a}}[/tex] and [tex]\rm{\vec{b}}[/tex] are the two vectors .
✍️ We have know that,
[tex]\orange\bigstar\:\rm{\pink{\boxed{\green{\vec{a}\:.\:\vec{b}\:=\:ab\cos{\theta}\:}}}}[/tex]
Where,
θ = 90°[tex]\rm{\implies\:\vec{a}\:.\:\vec{b}\:=\:ab\cos{90^{\degree}}\:}[/tex]
cos 90° = 0[tex]\rm{\implies\:\vec{a}\:.\:\vec{b}\:=\:ab\times{0}\:}[/tex]
[tex]\rm{\implies\:\vec{a}\:.\:\vec{b}\:=\:0\:}[/tex]
[tex]\rm{\red{\therefore}}[/tex] [1] The dot product of two vectors is “ 0 ” .
✍️ We have know that,
[tex]\orange\bigstar\:\rm{\pink{\boxed{\green{\vec{a}\:\times\:\vec{b}\:=\:ab\sin{\theta}\:}}}}[/tex]
Where,
θ = 90°[tex]\rm{\implies\:\vec{a}\:\times\:\vec{b}\:=\:ab\sin{90^{\degree}}\:}[/tex]
sin 90° = 1[tex]\rm{\implies\:\vec{a}\:\times\:\vec{b}\:=\:ab\times{1}\:}[/tex]
[tex]\rm{\implies\:\vec{a}\:\times\:\vec{b}\:=\:ab\:}[/tex]
[tex]\rm{\red{\therefore}}[/tex] [2] The cross product of two vectors is “ ab ” .
the dot and cross product will become zero if the angle becomes 90°
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If, as is typical, each of them breathes about 500 cm3 of air with each breath, approximately what volume of air (in cubic meters) do these astronauts breathe in a year
Answer:
a) 12614.4 m^3
b) 28.8 m
Explanation:
The complete question is
Four astronauts are in a spherical space station. (a) If, as is typical, each of them breathes about 500 cm^3 of air with each breath, approximately what volume of air (in cubic meters) do these astronauts breathe in a year? (b) What would the diameter (in meters) of the space station have to be to contain all this air?
The average breathing rate is 12 breaths per minute
there are 60 minutes x 24 hours x 365 days in a year = 525600 minutes in a year
if an average human takes 12 breath per minute, then in a year an average human take 12 x 525600 = 6307200 breath
For the four astronauts, the amount of breath = 4 x 6307200 = 25228800 breath in total.
The volume of air per breath = 500 cm^3
1 cm^3 = 10^-6 m^3
500 cm^3 = [tex]x[/tex] m^3
[tex]x[/tex] = 500 x 10^-6 = 5 x 10^-4 m^3
Therefore in a year, the volume of these astronauts breath in a year = 5 x 10^-4 x 25228800 = 12614.4 m^3
b) If the space station is spherical, the volume will be given as = [tex]\frac{4}{3} \pi r^3[/tex]
where r is the radius of the space station
This volume of the space station must be able to contain all the volume of breath produced by the astronauts which is = 12614.4 m^3
Equating, we have
12614.4 = [tex]\frac{4}{3} \pi r^3[/tex]
12614.4 = [tex]\frac{4}{3}*3.142*r^3[/tex]
12614.4 = 4.1893[tex]r^{3}[/tex]
[tex]r^{3}[/tex] = 12614.4/4.1893 = 3011.1
r = [tex]\sqrt[3]{3011.1}[/tex] = 14.4 m
diameter of the space station = 14.4 m x 2 = 28.8 m