Answer:
2,1,3
Explanation:
Edge 2020
A 25.0-mL aliquot of an aqueous quinine solution was diluted to 50.0 mL and found to have an absorbance of 0.656 at 348 nm when measured in a 2.50-cm cell.A second 25.0-mL aliquot was mixed with 10.00 mL of a solution containing 25.7 ppm of quinine; after dilution to 50.0 mL, this solution had an absorbance of 0.976 (2.50-cm cell). Calculate the concentration of quinine in parts per million in the sample.
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]
Find the dimensions [V] of volume. Express your answer as powers of length ( l), mass ( m), and time ( t).
Answer:
Volume equals to thrice the length. [tex][V] = [L]\times [L]\times [L][/tex]
Explanation:
Dimensionally speaking, volume equals to thrice the length. That is:
[tex][V] = [L]\times [L]\times [L][/tex]
Which of the following is a hypothesis?
A. Squid sometimes squirt ink.
B. What is a reason for squid to squirt ink?
C. If a squid is attacked by a predator, it will squirt ink.
D. All of the evidence accumulated by scientists over many years
shows that squid squirt ink to defend themselves.
Answer:
C
Explanation:
Hypothesis is one of the science methods. Hypothesis is the same as guessing. It's a scientific method that precedes observations.
According to the question asking that Which of the following is a hypothesis ?
The correct option is C which is
If a squid is attacked by a predator, it will squirt ink
It is an hypothesis because there is no experimental evidence to back it up.
if the mass is 10 gram and the volume is 7 cubic centimetre,find the density in kilogram per cubic metre
Answer:
1.42
Explanation:
devide 10 by 7
Which body system is most closely associated with transport and delivery?
It is Cardiovascular.
The body system that is most closely associated with transport and delivery is known as the cardiovascular.
What do you mean by Body system?The Body system may be defined as the collection of specific organs and tissues that work together in order to accomplish some important functions for the body. For example, the circulatory system plays an important role in the migration of oxygen and nutrients to each cell of the body via the blood.
The cardiovascular system effectively delivers numerous nutrients, hormones, oxygen, and other important substance to each cell of the body in order to facilitate the survivability of cells and entire organisms.
Therefore, the cardiovascular system is a type of body system that is most closely associated with transport and delivery.
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5. Scientists studying bull sperm whales off the coast of South Africa have
calculated that these mammals can descend to depths of nearly 3,000 m during
their search for food. What is this depth in kilometers?
Convert 183cm to meters
Pls show the work
Answer:
1.83 meters
Explanation:
1 meter = 100 cm
183cm/100cm= 1.83 meters
Submit the assignment following the instructions in the lesson assessment 01.05 measuring physical properties
Answer:jeff gordon is a boss
Explanation: i am so cool thats how i know its correct
both nuclear fusion and nuclear fission reactions____
Answer:
releases large amounts of energy
Explanation:
How many microseconds are equal to 4.2 ks?
How to represent milligram in kilogram by standard formula?
Answer:
0.000001 kg
Explanation:
because 1 kg equal 1,000,000 milligrams
we take [tex]\frac{1}{1,000,000}[/tex] which equals 0.000001 kg
a cart rolls down a track. it starts from rest and attains a speed of 2.7 m/s in 3 s, what is the acceleration and distance traveled?
Answer:
Acceleration and the distance traveled are 0.9 m/s² and 4.05 m
Explanation:
Given that,
Initail speed, u = 0
Final speed, v = 2.7 m/s
Time, t = 3 s
To find,
The acceleration and distance traveled.
Solution,
Acceleration is change in speed per unit time
[tex]a=\dfrac{v-u}{t}\\\\a=\dfrac{2.7-0}{3}\\\\a=0.9\ m/s^2[/tex]
Let s is the distance,
[tex]d=ut+\dfrac{1}{2}at^2\\\\\because u=0\\\\d=0+\dfrac{1}{2}\times 0.9\times 3^2\\\\d=4.05\ m[/tex]
So, acceleration and the distance traveled are 0.9 m/s² and 4.05 m
A car goes from 40 m/s to 30 m/s in 5 sec. What is its acceleration?
Please help me
The car's average acceleration is
a (ave) = (30 m/s - 40 m/s)/(5 s) = -2 m/s^2
(That is, divide the change in velocity by the time it takes for the change to take place.)
If acceleration is constant, then it is equal to the average acceleration.
Which organelle packages materials and distributes them throughout the cell?
O lysosome
O chloroplast
O Golgi body
O cell membrane
Answer:
golgi body
Explanation:
i took the test
Organelle packages materials and distributes them throughout the cell through the Golgi body (also known as the Golgi apparatus or Golgi complex). The correct option is C.
The Golgi body plays a crucial role in the packaging, modifying, and sorting of proteins and lipids synthesized in the endoplasmic reticulum (ER). It receives these molecules from the ER and then modifies them, such as by adding sugars or lipids. The Golgi apparatus then packages these molecules into vesicles and distributes them to their appropriate destinations within the cell, such as other organelles or the cell membrane.
A. Lysosome: Lysosomes are organelles responsible for the digestion of waste materials, cellular debris, and foreign substances. They contain enzymes that break down various molecules. Lysosomes are not involved in packaging and distributing materials throughout the cell.
B. Chloroplast: Chloroplasts are organelles found in plant cells responsible for photosynthesis, the process by which sunlight is converted into chemical energy. Chloroplasts are involved in producing energy-rich molecules (such as glucose) rather than packaging and distributing materials within the cell.
D. Cell membrane: The cell membrane (also known as the plasma membrane) is a semipermeable barrier that surrounds the cell, separating its internal environment from the external environment. While the cell membrane controls the entry and exit of substances into and out of the cell, it is not directly involved in packaging and distributing materials within the cell.
Therefore, the Golgi body is the correct answer as it specifically carries out the task of packaging and distributing materials throughout the cell.
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why should we conserve biodiversity
which of the following is a class of wave in physics
A. Ripple tank
B. Electromagnetic
C. Stationary
D. longitudinal
Answer: They are all types of waves
A. Ripple tank
B. Electromagnetic wave
C. Stationary wave
D. longitudinalwave
Explanation:
what type of quantity is frequency
If you walk 30 meters forwards, and then turn around and walk 25 meters backwards, what is the distance that you walked? What displacement do you have after this walk?
Given :
Walk in forward direction is 30 m .
Walk in backward direction is 25 m .
To Find :
The distance and displacement .
Solution :
We know , distance is total distance covered and displacement is distance between final and initial position .
So , distance travelled is :
D = 30 + 25 m = 55 m .
Now , we first move 30 m in forward direction and then 25 m in backward direction .
So , displacement is :
D = 30 - 25 m = 5 m .
Therefore , distance and displacement covered is 55 m and 5 m respectively .
Hence , this is the required solution .
give some examples of applications that resulted from work done by physicists
Example reuikfur2skied
difference between universal law of gravitation and acceleration due to gravity
Explanation:
The acceleration on an object due to the gravity of any massive body is represented by g (small g). The force of attraction between any two unit masses separated by unit distance is called universal gravitational constant denoted by G(capital g). The relation between G and g is not proportional. That means they are independent entities.
G and g
In physics, G and g can be related mathematically as –
\(g=\frac{GM}{R^{2}}\)
Where,
1=g is the acceleration due to the gravity of any massive body measured in m/s2.
2=G is the universal gravitational constant measured in Nm2/kg2.
3=R is the radius of the massive body measured in km.
4=M is the mass of the massive body measured in Kg.
Why do u think women basketball is not as popular as men’s basketball
Answer: Look, the main difference between men's and women's college basketball is the attention the programs and players get. The women's ball is slightly smaller than the men's ball. ... Men get a thirty-five-second shot clock, while women only get a thirty-second shot clock.
If a NASCAR driver is driving around a track, and he travels 600 miles in 3 hours, what is his average speed in miles per hour (mph)? __________ mph
Answer:
200 mph.
Explanation:
If a NASCAR driver travels 600 miles in 3 hours, the way to calculate the speed at which the car is driving comes from dividing the distance factor by the time factor.
Thus, we must divide 600 by 3 (600/3), which gives 200 as result. Thus, if in 3 hours he travels 600 miles, in one hour he will travel 200 miles, which means that his average speed is 200 mph.
A parachutist bails out and freely falls 63 m. Then the parachute opens, and thereafter she decelerates at 1.5 m/s2. She reaches the ground with a speed of 3.3 m/s. (a) How long is the parachutist in the air
Answer:
(a) The parachutist spent 24.84 secs in air
(b) The height the fall begins is 472 m
Explanation:
Here is the complete question:
A parachutist bails out and freely falls 63 m. Then the parachute opens, and thereafter she decelerates at 1.5 m/s2. She reaches the ground with a speed of 3.3 m/s. (a) How long is the parachutist in the air (b) At what height does the fall begin?
Explanation:
From one of the equations of kinematics for free fall
[tex]H = ut - \frac{1}{2}gt^{2}[/tex]
Where H is the height
u is the initial velocity
t is the time
and g is the acceleration due to gravity (Take g = 9.8 m/s2)
Now, we can find the time spent before the parachute opens.
u = 0 m/s (we assume the parachutist starts from rest)
H = - 63 m
∴[tex]-63 = 0(t) - \frac{1}{2}(0.98) t^{2} \\-63 = -4.9 t\\t^{2} = \frac{63}{4.9} \\t^{2} = 12.86\\t = \sqrt{12.86} \\t = 3.59 s[/tex]
This the time spent before the parachute opens
Also from one of the equations of kinematics for free fall
[tex]v = u - gt[/tex]
where v is the final velocity
We can determine the final velocity before the parachute opens and she starts to decelerate
∴[tex]v = - 9.8(3.59)\\v = - 35.18m/s[/tex]
Now, we will calculate the time spent after the parachute opens
From one of the equation of kinematics for linear motion,
[tex]v = u + at[/tex]
Here, the initial velocity will be the final velocity just before the parachute opens, that is
[tex]u = - 35.18 m/s[/tex]
From the question,
[tex]v = - 3.3 m/s[/tex]
[tex]a = 1.5 m/s^{2}[/tex]
We then get
[tex]-3.3 = - 35.18 + (1.5)t[/tex]
[tex]-3.3 + 35.18 = 1.5t\\31.88 = 1.5t[/tex]
[tex]t = \frac{31.88}{1.5}[/tex]
[tex]t = 21.25 secs[/tex]
(a) To determine how long the parachutist is in the air,
That is sum of the time used when falling freely and the time used after the parachute opens
= 3.59 secs + 21.25 secs
24.84 secs
Hence, the parachutist spent 24.84 secs in air
(b) To determine what height the fall begins
First, we will calculate the height from which the parachute opens
From one of the equation of kinematics for linear motion,
[tex]x = ut + \frac{1}{2}at^{2} \\[/tex]
[tex]x = -35.18(21.25) + \frac{1}{2}(1.5)(21.25)^{2} \\x = -747.58 + 338.67\\x = -408.91m\\[/tex]
[tex]x[/tex] ≅ [tex]- 409m[/tex]
Hence, the height the fall begins is 63m + 409m
= 472 m
You don't learn any movement concepts until high school.
Answer:
true
Explanation:
Answer:
yes
Explanation:
you don't learn it until high school
What makes scientific investigations similar to other types of investigations?
tions?
What makes scientific inuartia
Answer:
All investigations share steps of the scientific method, such as asking a question, conducting research, or analyzing data. The differences between investigations are usually related to what's being examined and the order of the steps followed.
In a criminal investigation, facts are collected about a crime that has already happened. While there are individual tests that can be done on certain types of evidence, there isn't an experiment to test every part of a crime. It can also be difficult to control all factors in a crime scene in order to test one variable at a time. Usually, there are so many variables and missing facts in a crime that a hypothesis and conclusion are hard to determine.
Explanation:
hope it helps <3
All types of investigation involve the steps of the scientific method, such as asking questions, researching, analyzing data, etc.
What are scientific investigations?The research methods and techniques that can be used in order to develop hypotheses, conduct experiments, analyze data, and draw conclusions are called scientific investigations.
The evidence does not give enough solutions but it can lead to new issues for investigation. The methods that can be used by scientists to do scientific investigations involve scientific methods. The steps utilized by scientists to conduct the scientific investigation include:
Scientific investigation starts with an observation. After observing unusual we commonly question ourselves.
A hypothesis can be described as the possible answer to any scientific question. The hypothesis is logical still it can be falsifiable. The results of the test whether the evidence agrees with the prediction and supports the hypothesis or not to create a conclusion.
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PLEASE HELP WILL NAME BRAINLIEST!! An object is dropped from rest. What is its instantaneous speed when it has been in motion for 4 s? The acceleration of gravity is 9.8 m/s^2 Answer in units of m/s.
Explanation:
Using kinematics,
t = 4s
u = 0m/s
a = 9.8m/s^2
Therefore v = u + at = 0 + (4)(9.8) = 39.2m/s.
Which state(s) of matter have no definite shape or volume? liquids and solids liquids and gasses gasses solids
Answer:
c gasses
Explanation:
Liquid and gases state(s) of matter have no definite shape or volume
What is the matter?Anything which has mass and occupies space is known as matter, mainly there are four states of matter solid liquid gases, and plasma.
These different states of matter have different characteristics according to which they vary their volume and shape.
The solid has a definite shape and definite volume because the atoms and molecules of the solid are very close to each other forming a great bond structure.
The liquid and gaseous state have their atoms and molecules apart from each other forming a loose bonding structure because this liquid does not have a fixed shape it takes the shape of the container, similarly, gases, their atoms are far apart from each other that's why they don't have fixed shape or the fixed volume.
States of matter those have no definite shape or volume are liquids and gases.
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What is the maximum energy that can be transferred to an electron in a hard collision by a 25 MeV
a) Electron (according to convention)
b) Positron
c) Proton
d) Alpha particle
Answer:
Electrons
Explanation:
The electrons are called the subatomic particles. The electrons have one of the symbol of e-and β-. The electrons are the first generation of the Lepton particles. These are generally describe the elementary particles. These particles do not have components and substructure.
Like all other elements the electrons also exhibits some types of properties. These electrons also hit with another particles and start to diffracted in different direction like lights.
The wave property of the electrons can be observed with the help of experiment.
You are driving down a two-lane road at 45 mph. The oncoming vehicle�s right wheels drop off the pavement. The most likely occurrence is...
Answer:
a)The vehicle will enter your lane
Explanation:
The complete question is
You are driving down a two-lane road at 45 mph. The oncoming vehicle's right wheels drop off the pavement. The most likely occurrence is...
a)The vehicle will enter your lane
b)The vehicle will continue on the shoulder of the road.
c)The vehicle will spin out and hit a tree.
d)The vehicle will return smoothly back onto the road.
The dropping off of the oncoming vehicle's right wheel off the pavement will force the driver to overturn to the left towards you, and this might lead to the vehicle entering your own lane.
Which option gives an object's volume in Sl units?
A. 3.4 L
B. 2.6 m3
C. 5.5K
D. 4.3 kg
Answer:
B.
Explanation:
K is the SI unit for Kelvin which measures temperature.
kg is NOT an SI unit, g is the SI unit for mass.
L is NOT an SI unit, m^3 is the SI unit for volume.
Therefore the answer is B.