The concentration of Hoac and oac in a 0.2 m acetate buffer at ph 5.00 is 0.1178M.
CalculationKa of Acetic Acid= 1.7 x 10^-5.
So pKa= - log (1.7 x10^-5) = 4.7695 ~4.7
But pH= pKa+ log(salt/acid)
pH= 4. 77+log(salt/acid) = 5.00
So, log (salt/ acid) = 5.00- 4.77= 0.23. So, salt/acid= 10^0.23=1.6982.
Therefore, if the concentration of acetate ion (CH3-COO-) is 0.2 M, the concentration of CH3-COOH =0.2/1.6892= 0.1178M
What is the HOAc concentration?The amount of HOAc molecules and OAc- ions are now both present in the same quantity. The concentration of the H3O+ ion at Point B is equal to the value of Ka for the acid since the ratio of the concentrations of HOAc and OAc- is 1:1.
This gives us a means to calculate an acid’s Ka value.
How do you determine an acetate buffer’s pH?You’ll need different amounts of buffer, so check with your instructor or the protocol to see how much you’ll need.
The Henderson-Hasselbalch equation, pH = pKa + log (acetate concentration/acetic acid concentration), can be used to calculate the ratio of acetic acid to acetate concentration.
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five charges are placed in a closed box. each charge (except the first) has a magnitude which is twice that of the previous one placed in the box. all charges have the same sign and (after all the charges have been placed in the box) the net electric flux through the box is 7 × 107 n · m 2 /c. what is the magni
The magnitude of the charge is q = 13.423 µC.
What is point charge?If the magnitude of an electric charge for a body is very small compared to the distance between them, they are referred to as point charges. As a result, the charge is thought to be concentrated at that location.
Let the first charge be q.
So
q1 = q
q2 = 2q
q3 = 4q
q4 = 8q
q5 = 16q
Total charge Q = q1 + q2 + q3 + q4 + q5 = 31q
Flux f = 4.7 × 10^7 N · m2/C
According to gauss law
Flux f = Q/(permittivity of free space)
4.7 × 10^7 = 31q/(8.854*10^-12)
q = 1.3423*10^-5
= 13.423*10^-6 C
= 13.423 µC
The smallest possible charge q = 13.423 µC
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(5)_____ states that "the of an object is equal to the on an object divided by the mass of the object.
Newton's second law of motion states that "the acceleration of an object is equal to the force on an object divided by the mass of the object."
Newton's second law of motion is also called the law of acceleration as it tells us about the acceleration of a moving object under the influence of an unbalanced force or net force not equal to zero.
According to the law, the acceleration of an object is directly proportional to the force on the object and inversely proportional to the mass of the object.
Acceleration a ∝ Force F ....1
Acceleration a ∝ 1/Mass m ....2
From 1 and 2 Acceleration a = [tex]\frac{Force}{Mass}[/tex]
Therefore, Newton's second law of motion states that "the acceleration of an object is equal to the force on an object divided by the mass of the object."
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A bullet is fired horizontally 0.58 meters off the ground. Assuming gravity is 9.8 m/s2, how long (t) was the bullet in the air?
Answer: well
Explanation:
Assuming the bullet fired is a 32-gram .458 Winchester Magnum then it will take from 3.386 seconds to cover 1500 meters at 20∘C to 3.404 seconds to cover 1474.6 meters at 0∘C. You cannot assume there is no air resistance without the result being incorrect by about 500 meters.
Ik this is super simple so I’m just gunna look it up if no body responds but what’s the formula for the Area of a triangle
The answer is:Area=1/2×b×h
Answer:
A= b×h ÷ 2
Explanation:
The Area of a triangle formula is the Base multiplied by the Height, then divided by 2
A car accelerates from a velocity of 100ms-1 to a final velocity of 20ms-1 in 10 seconds.Find it's deceleration.
The deceleration of the car from a velocity of 100ms-1 to a final velocity of 20ms-1 in 10 seconds is 8ms-2.
We are aware that acceleration refers to an object's rate of increase in speed, and deceleration refers to an object's rate of decrease in speed.
Because it must be reported as a magnitude and a direction, acceleration is a vector. Negative and positive signs are used to denote the direction in circumstances of one-dimensional motion. Negative indicators indicate that the object is slowing down.
The unit of measurement is the meter per second square, or ms-2.
We know that
v= u + at,
where,
v= final velocity
u= initial velocity
t= time
a= acceleration
According to the question,
u= 100ms-1
v= 20ms-1
t= 10s
a=?
so, v = u + at
substituting the values in the equation, we get:
20 = 100 + 10a
a= -8 ms-2
Here, the negative sign shows that the car is decelerating,
Thus, deceleration is 8ms-2.
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A boat sailed for 7 hours at the speed of 80 km per hour it changed its speed to 95 km per hour for the next 6 hours how far had the boat sailed in kilometers
The boat had sailed 1130km.
How to find how far the boat had sailed?Initial Boat travel time = 7 hours.
The boat's initial speed is 80 km/h
The boat's current speed is 95 km/h.
Boat travel time at present = 6 hours.
Total nautical miles traveled =?
Solution:
Speed = distance / time.
The distance = Speed * Time
1. Distance = 80 km/h x 7 hours
Distance = 560 km
2. Distance = 95km/h x 6hours
Distance = 570 km
Hence, total distance = 560km + 570km
= 1130km
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Two students added a vector for a moving object’s position at t=2s to a motion diagram. When they compared their diagrams, they found that their vectors did not point in the same direction. Explain
They found out that their vectors did not point in the same direction because the two students observed the vector's motion from opposite direction.
What is vector addition?Vector addition is the operation of adding two or more vectors together into a vector sum. For two vectors, the vector sum is obtained by placing them head to tail and drawing the vector from the free tail to the free head.
When the two students added a vector for a moving object’s position at t=2s to a motion diagram. They found out that their vectors did not point in the same direction because the two students observed the vector's motion from opposite direction.
Thus, they found out that their vectors did not point in the same direction because the two students observed the vector's motion from opposite direction.
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Resolve a vector of 50 km at 35° south of West into its x and y components
Answer:
See below
Explanation:
With N at 0 degrees
35 degrees south of west becomes 90 + 35 = 125 °
x component 50 km cos 125 = - 28.7 km
y component 50 km sin 125 = 41 km
An object with a negative acceleration can
have a positive velocity
Answer:Is it possible to have positive acceleration with a negative velocity?
Explanation:An object which moves in the positive direction has a positive velocity. If the object is slowing down then its acceleration vector is directed in the opposite direction as its motion (in this case, a negative acceleration).
I WILL MARK U BRAINLIEST IF U COULD ANSWER THIS QUESTION!
Why should we learn atomic theory? If it is probably incorrect in some way and will undoubtedly change, why do we spend time learning about it?
Answer: The atomic theory is important because it describes the composition of the atom and the properties of the subatomic particles as well as their behavior.
Explanation:
Even if our grasp of atomic theory may continue to develop throughout time, learning about it is still important for a number of reasons.
Thus, Atomic theory gives the fundamental ideas for comprehending matter behaviour and interactions between atoms and molecules, which forms the basis of modern chemistry.
It serves as the cornerstone of contemporary chemistry and provides insight into a number of chemical processes.
The development of atomic theory throughout millennia has been shaped by the efforts of numerous scientists. It has roots in antiquity.
Thus, Even if our grasp of atomic theory may continue to develop throughout time, learning about it is still important for a number of reasons.
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Consider three forces p1, p2, and p3 such that p1 = 20 lb, p2 = 45 lb, and p3 = 46 lb. determine the direction of the resultant of the three forces.
The direction of the resultant of the three forces can be seen as resultant is 78.25 lb and its direction can be calculated as [tex]\theta[/tex] =65.19°.
CalculationTo find component in x-direction,
Fx = p3 cos(30) + p2 cos (30+45) - p1 cos (40)
Fx = 46 cos(30) + 45 cos (75) - 20 cos (40)
Fx = 46x 0.866 + 45x 0.2588 - 20x 0.766
Fx = 39.836+11.646-15.32
Fx = 36.165 lb
To find component in y direction,
Fy = -p3 sin(30) - p2 sin (30+45) - p1 sin(40)
= -[ 46x 0.5 + 45x 0.96 + 20x0.16]
= -[23 + 43.2 + 3.2]
= - 69.4 lb
Fr = [tex]\sqrt{fy^{2} +fx^{2} }[/tex]
=[tex]\sqrt{(-69.4)^{2} + (36.165)^{2} }[/tex]
=[tex]\sqrt{4816.36+1307.9}[/tex]
=[tex]\sqrt{6124.26}[/tex]
= 78.25 lb
Then to find [tex]\theta[/tex]
[tex]\theta\\[/tex] = [tex]tan^{-1} \frac{fy}{fx}[/tex]
=[tex]tan^{-1}[/tex] (78.25/36.165)
= [tex]tan^{-1}[/tex] (2.163)
= 65.19°
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A planet with a mass of 1 x 1024 kg has a radius of 4,940 km (4,940,000 m). what is the acceleration due to gravity at its surface?
Answer:
9.8 m/s2
Explanation:
the Acceleration is due and represented by g and the answer to that is 9.8 m/s2
How could you test to see if your specimen will grow and how does that relate to cell theory
The correct answer is Every living thing is formed of cells. When an old cell dies, a new cell is created.
All living things are primarily composed of cells, which serve as both the basic structural and organisational unit of all living things. According to the biological notion known as "cell theory," all cells are descended from previously existing cells. In the middle of the nineteenth century, it was initially put forward. All living things are composed mostly of cells, which also serve as the fundamental unit of reproduction. The cell theory is based on the following three basic postulates:
Every living thing is made up of one or more cells.The fundamental unit of structure and organisation in organisms is the cell.New cells are created from pre-existing cells.To learn more about cell theory refer the link:
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A stone dropped from a cliff hits the ground 3 s later. find the speed with which the stone hits the ground, and the distance it fell.
The speed as the stone hits the ground is 29.4 m/s
The distance at which the stone fell is 44.1 m.
What is speed?Velocity is the pace and direction of an object's movement, whereas speed is the time rate at which an object is travelling along a path. In other words, velocity is a vector, whereas speed is a scalar value.
An example of an amphetamine is speed. It is a central nervous system stimulant that releases significant amounts of dopamine. Dopamine is a neurotransmitter in the brain linked to reward and pleasure.
Although it is occasionally used to refer to other amphetamines, speed is the street name for amphetamine sulphate. It typically appears as an off-white or pinkish powder and occasionally as crystals. It can also be found in the form of a paste, which is often white, grey, or brown in color and can be grippy and wet.
Speed can be defined as the ratio of distance to time.
(a) To calculate the speed at which the stone hit the ground, we use the formula below.
Formula:
v = u+gt............ Equation 1
Where:
v = Final speed of the stone
u = Initial speed of the stone = 0 m/s
t = time = 3 seconds
g = acceleration due to gravity = 9.8 m/s²
Substitute the values above into equation 1
v = 0+3×9.8
v = 29.4 m/s
(b) To calculate the distance the stone fell, we use the formula below.
S = ut+gt²/2........... Equation 2
Where:
S = Distance
Solving for S by substituting into equation 2
S = (0×3)+(9.8×3²)/2
S = 44.1 m
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An accelerometer is a device that uses the extension
a spring to measure acceleration in terms of Earth's gravitational acceleration (g). What is
the approximate acceleration if this accelerometer spring is extended just 0.43 centimeters?
Answer:
your question explains that an accelerometer is a device that uses the extension spring to measure acceleration in terms of Earth's Gravitational accelerations. So if this device is extended just 0.43 centimeters the possible accelerations is letter B. 0.80 g
At a construction site, a 1.50kg brick is dropped from rest and
hits the ground at a speed of 26.0m/s. Calculate the
gravitational
energy of the brick before it was dropped.
The gravitational energy of the brick before it was dropped was 507.15 J.
Let us assume that the brick is dropped from the rest at a height of h meters above the ground and reaches the ground at a speed of 26.0 m/s.
Given in question
Initial Velocity = u = 0 m/s ( dropped from rest )
Final Velocity = v = 26.0 m/s
Acceleration = a = g = 9.8 m/s
Using the third equation of motion,
v² - u² = 2ah
Put in the values, we get
(26)² - (0)² = 2×9.8×h
19.6h = 676
h = 676/19.6
h = 34.5 meters
So the brick was at the height of 34.5 meters before it was dropped. The gravitational potential energy of the body is given by
U = mgh, where
m = mass = 1.5 kg
g = acceleration due to gravity = 9.8 m/s²
h = height above the ground = 34.5 m
Put in the values, we get
U = 1.5×9.8×34.5 J
U = 507.15 J
Therefore, the gravitational energy of the brick before it was dropped was 507.15 J.
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You measure the mass of a 0.500 kg (500 g) standard on your balance four times. The following measurements result: 492 g, 507 g,
505 g, 496 g.
Which choice best describes your balance?
not precise and not accurate
not precise but accurate
precise but not accurate
precise and accurate
If the measurement is taken for four different times for same weight and is always different then the balance is precise but not accurate.
What are ways to measure mass?There are numerous instruments available for measuring mass in various settings. The use of gravitational interaction between objects is one of them, along with balances and scales, measurement transducers, vibrating tube sensors, Newtonian mass measurement devices, and balances and scales.
The kilogram, which is defined as equal to 6.6260 x 10³⁴joule second in terms of Planck's constant, is the unit of mass in the International System of Units (SI). A joule is equal to one kilogram multiplied by one square meter per second.
A beam balance is always used to determine mass. Because a spring balance measures weight rather than mass, it will read differently depending on where you are on the planet.
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A juggler throws two balls in the air. She throws the first ball up with a velocity of 9. 8 m/s. She throws the second ball up with a velocity of 14. 7 m/s. How long after catching the first ball will she catch the second?.
Juggler will catch the second ball 1 second after catching the first ball as the first ball comes down 1 second earlier than the second.
Two balls are thrown into the air. The first ball goes up with a velocity of 9.8m/s and the second ball goes with a velocity of 14.7m/s. We have to find out the Time difference between the balls when both of them land in the hand. We have Newton's first equation : v = u + at => t = (v-u)/a
where, v = Final velocity, u = Initial velocity, a=g = Acceleration of gravity, and t = Time
For First ball, v1 = 9.8m/s, u1 = 0, g = 9.8 (acceleration for gravity), t1 = time and multiplying the equation by 2 for marking journey of balls for both going up and down
=> t1 = 2(v1-u1)/g => t1 = (9.8-0)/9.8
=> t1 = 2 seconds
For second ball, v2 = 14.7m/s, u2 = 0, g = 9.8 (acceleration for gravity),
t2 = time & multiplying the equation by 2 for marking journey of ball for both going up and down => t2 = 2(v2-u2)/g
=> t2 = (14.7-0)/9.8 => t2 = 3 seconds
Difference between the time taken by both balls t = t2-t1
=> t = 1 second
So the second ball lands after 1 second.
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Draw Water Molecules Required Using circles and motion lines to represent water molecules, draw a model of water on the molecular level. Be sure to show that water molecules are: • Randomly arranged. • Close together because they attract each other Moving
Water is a colorless, transparent chemical that makes up the majority of the earth's oceans, lakes, and streams. It is a crucial fluid that is essential to the continued existence of life on Earth.
The chemical formula for water is H2O. Two hydrogen atoms and one oxygen atom are held together by covalent bonds to make it up. The surface of the earth is made up of 71% of this liquid.
The boiling point of water is 100 degrees Celsius.
The freezing point of water is zero degrees Celsius. Water takes a very long time to freeze (or even boil), which is essential for the survival of our ecosystem.
Water becomes denser as it cools up to 4°C. Water then becomes less dense, though.
Therefore, Ice floats on water.
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Your question is incomplete but the above content might help.
Photons are shone on a piece of metal and one electron is ejected for each absorbed photon. What happens when the wavelength of light is decreased?.
When the wavelength of light is decreased the ejected electrons would have greater kinetic energy.
What is kinetic energy?A kind of energy that an item or particle possesses as a result of its mobility is known as kinetic energy.
When an item undergoes work—the transfer of energy—by being subjected to a net force, it accelerates and consequently obtains kinetic energy.
An object's kinetic energy is the energy it has as a result of motion.
Kinetic energy is the force that drives an object's motion.
Kinetic energy can be found in moving objects such as a bullet traveling at high speed or a person walking.
The energy brought on by the random, continuous bouncing of atoms or molecules is another illustration of kinetic energy.
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Bill is driving a very old car with a hood designed to be rigid in a crash. linda is driving a new car with a hood
designed to crumple in a crash. both have the same mass and are wearing seatbelts. in a head-on collision at the
same speed with a stationary wall, which driver will experience greater force?
Bill will experience the greater force.
What is mass?Mass is a physical body's total amount of matter. It also serves as a gauge for the body's inertia or resistance to acceleration (change in velocity) in the presence of a net force. The strength of an object's gravitational pull to other bodies is also influenced by its mass.The kilogram is the SI unit of mass (kg). In science and technology, a body's weight in a given reference frame is the force that causes it to accelerate at a rate equal to the local acceleration of free fall in that frame.For instance, a kilogram mass weighs around 2.2 pounds at the surface of the planet. However, the same kilogram mass would weigh just about 0.8 pounds on Mars and about 5.5 pounds on Jupiter.An object's mass is a crucial indicator of how much stuff it contains. Weight is a measurement of an object's gravitational pull. It is influenced by the object's location in addition to its mass. As a result, weight is a measurement of force.Bill is driving a very old car with a hood designed to be rigid in a crash. Linda is driving a new car with a hood designed to crumple in a crash. Both have the same mass and are wearing seatbelts. in a head-on collision at the same speed with a stationary wall, which driver will experience greater force:
Bill will experience the greater.
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Rate of acceleration for a 5 kg grocery cart that’s being pushed with 50 N
Rate of acceleration for a 5 kg grocery cart that’s being pushed with 50 N is 10 m/sec^2. The value of acceleration can be calculated with the help of following formula Fnet = m . a
What is the calculation of the above problem?Fnet is the net force acting on the shopping cart
m is the mass of the grocery cart
a is the acceleration of the shopping cart
So on using the formula we get
Fnet = m . a
So on putting the values we get
Fnet = 50 N
m = 5kg
a = ?
50 = 5.a
On calculating we get the value of acceleration
a = 10 m/sec^2
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All gases exhibit ideal behavior in low pressure situations because when the pressure is very low, the gas particles are.
Gases move slower at temperatures not pressures.
What happens to gas at low pressure?The average kinetic energy of the gas particles falls as the temperature rises. Because of this, a greater percentage of gas molecules lack the kinetic energy needed to repel intermolecular forces generated by nearby atoms.As air pressure drops, the air spreads out or expands more widely. There is a consequent drop in temperature.The temperature of a gas is directly proportional to its pressure for a constant volume of gas in a sealed container, according to the pressure law.The amount of oxygen available to breathe likewise reduces when the pressure drops. At very high altitudes, the oxygen levels and air pressure are so low that individuals can get sick or possibly pass away.All gases exhibit ideal behavior in low-pressure situations because when the pressure is very low, the gas particles are:
Far apart and rarely interacting
- gases move slower at temperatures, not pressures.
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If the density of an object is 9.331 x 10−2 lbs/cubic inch, what is its density in g/cm3?
A substance's density is defined as its mass per unit of volume. Density is most frequently represented by the symbol ρ, however Latin letter D may also be used.
If the density of an object is 9.331 x 10−2 lbs/cubic inch, what is its density in g/cm3?
9.331 x 10−2 lbs/cubic inch = 258 281 190,85 g/m³
To calculate the density:
Determine an object's weightFind out an object's volume.Weight to volume ratio.Alternately, switch the unit.The following is the density formula:
D = m/v, where D = Density, m = mass, v = volume.
Write down the data and the density equation, solve for the mass, add the density to the volume, then multiply the result to get the density in grams.
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Which model best represents the results the student would expect to see if the dialysis bag filled with a 5% starch solution is placed in distilled water for one hour?.
The model that best represents this phenomenon is called Osmosis
In osmosis, a semi-permeable membrane allows the solvent to pass from a higher solvent concentration to a lower solvent concentration (or, to put it another way, from a lower solute concentration to a higher solute concentration).
As a result, the dialysis bag with the highest concentrated starch solution will absorb the most water from the outside (present in the beaker).
Line A thus displays the information gathered from the bag containing the highest concentrated starch solution.
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when is the ideal time to take a resting heart rate
According to doctors and health experts, resting heart rate should be taken before doing any physical activity. It is ideal to take your resting heart rate first thing in the morning.
The resting heart rate of an individual is of great importance in a medical examination as it is indicative of various infections or heart-related problems, if any, present in the individual.
The resting heart rate of any healthy individual falls between the range of 60 to 100 beats per minute. A resting heart rate below 60 and above 100 beats per minute, without any direct reason such as heavy exercise and physical exertion might be indicative of a serious developing heart condition; and the particular individual should consult a doctor.
The ideal time to take a resting heart rate is during resting time. It should be taken first thing in the morning before even coming out of bed. Resting heart rate should not be taken immediately after exercising or a workout.
Therefore, the ideal time to take resting heart rate is early in the morning before leaving the bed and doing any sort of physical activity.
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. You roll a tennis ball a distance of 18 meters. It takes 6 seconds to cover the distance. What is the average speed of the tennis ball?
I got 3 as an answer am I right
all I can offer is 14 points since that's all I have left lol
The average speed of the tennis ball is 3 m/s.
What is average speed?Average speed can be defined as the ratio of the total distance to the total time covered by the body. The S.I unit of average speed is m/s.
To calculate the formula below.
Formula:
S = d/t............... Equation 1Where:
S = Average speed of the balld = Total Distancet = Total time.From the question,
Given:
d = 18 meterst = 6 secondsSubstitute these values into equation 1
S = 18/6S = 3 m/sHence, The average speed of the tennis ball is 3 m/s.
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O
The average speed of a dog who walks 30 Km in 120 seconds is
0.004 m/s
0.25 m/s
13200 m/s
250 m/s
Doba
Deci
Centi
Answer:
250 m/s (VERY fast !)
Explanation:
30 km = 30 000 m
30 000 m / 120 s = 250 m/s
bathyscaphes are capable of submerging to great depths in the ocean. what is the pressure at a depth of 5 km, assuming that seawater has a constant specific gravity of sg
Water depth Bathyscaphes can submerge at a depth of h=5 km=5000 m.
the seawater's particular weight,
γ=10.1kN/m3
Through the equation, the density of the seawater and its specific weight are connected.
γ=ρg→(I)
where rho is the seawater's density and g is the acceleration brought on by gravity.
Given is the pressure at a depth of h meters. ,
P=ρgh→(II)
When equation I is substituted, equation (ii),
P=γh
About substituting
P=10.1×103×5000=50.5×106Pa=50.5MPa
1 Pascal =1.45×10−4psI
50.5 MPa corresponds to
50.5MPa=50.5×106×1.45×10−4psI=7322.5psI
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a bullet is shot horizontally from shoulder height (1.55 m) with an initial speed of 210 m/s. how much time elapses before the bullet hits the ground? how far does the bullet travel horizontally?
The ratio of displacement to time is known as velocity. The bullet needs 0.553 seconds before it touches the ground.
Consider the vertical motion of bullet
We have equation of motion s = ut + 0.5 at²
Initial velocity, u = 0 m/s
Acceleration, a = 9.81 m/s²
Displacement, s = 1.5 m
Substituting
s = ut + 0.5 at²
1.5 = 0 x t + 0.5 x 9.81 xt²
t = 0.553 s
Time elapsed before the bullet hits the ground is 0.553 seconds.
b) Consider the horizontal motion of bullet
We have equation of motion s = ut + 0.5 at²
Initial velocity, u = 200 m/s
Acceleration, a = 0 m/s²
Time, t = 0.553 s
Substituting
s = ut + 0.5 at²
s = 200 x 0.553 + 0.5 x 0 x 0.553²
s = 110.6 m
The bullet travels horizontally 110.6 m.
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