You want to make 30 milliliters of a 1/500 dilution of urine in water. how much diluent will it take?

Answers

Answer 1

29.94 mL of diluent is needed to make 30 milliliters of a 1/500 dilution of urine in water.

The dilution factor (or dilution ratio) expresses how much of the original stock solution remains in the entire solution following dilution. It is frequently expressed as a ratio. The dilution factor in the question is 1/500.

To calculate the diluent, the ratio of the diluent must also equal the ratio the original solvent. Hence, if the total volume is 30 mL it must have the same ratio has the 1/500 dilution

1/500 = x/30

X = 0.06 mL

If only 0.06 mL of the 30 mL is urine, then the (30 mL - 0.06 mL) = 29.94 mL is the diluent.

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Related Questions

what was Ethan's velocity between 9:30 and 10:00, in km/hr?​

Answers

Ethan's velocity between 9:30 and 10:00 in km/hr is 10.​

Equation :

To know the velocity of the in between 9.30 and 10,

Use the formula,

speed = distance / time

Given,

distance 1 = 10 km

distance 2 = 15 km

time = 30 min

v = ?

Putting values,

v = Δs/Δt

v = 15 - 10 / 30 min

v = 5 / 1800 sec

v = 5000 m / 1800 sec

v = 2.78 m/sec

Or,

v = 5 km / 0.5 h

v = 10.0 km/h

Velocity :

The direction of a body or object's movement is defined by its velocity. In its basic form, speed is a scalar quantity. In essence, velocity is a vector quantity. It is the speed at which distance changes. It is the displacement change rate.

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A gas cylinder of cf2=cf2 is unexpectedly found to have lost all pressure. upon being sawn open, what was discovered? (a true story)

Answers

The correct answer is Teflon

Numerous applications can be found for polytetrafluoroethylene (PTFE), a synthetic fluoropolymer of tetrafluoroethylene. It is one of the most popular and often used PFAS. Teflon, manufactured by Chemours, a division of DuPont, which made the compound's initial discovery in 1938, is the term by which PTFE-based materials are most generally recognized. Polytetrafluoroethylene, a high-molecular-weight polymer made entirely of fluorine and carbon, is a fluorocarbon solid. PTFE is hydrophobic, meaning that neither water nor things containing water can bind to it. This is because fluorocarbons only exhibit weak London dispersion forces since fluorine has a poor electric polarizability. One of the lowest coefficients of friction of any substance is found in PTFE. For pans and other cookware, polytetrafluoroethylene is utilized as a non-stick coating.

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what is meant by temperature?​

Answers

Answer:

Average kinetic energy per molecule in a substance

Explanation:

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Matthew was parasailing at a constant velocity behind a motorboat. As he was parasailing, he
passed over a kayak moving at 64 meters per minute, and he moved 200 meters west in
0.5 minutes. What was Matthew's velocity?
Write your answer as a whole number.
meters per minute to the west

Answers

As he was parasailing, he passed over a kayak moving at 64 m/minute, and he moved 200 meters west in 0.5 minutes. Matthew's velocity will be 400m/minute to the west.

The velocity of an object can be defined as the rate of change of an object's position relative to the frame of reference and over time. It sounds complicated, but basically, the speed is accelerating in a particular direction. It is a vector quantity, which means we need both magnitude (speed) and direction to determine speed. Its SI unit is meters per second (ms-1). If there is a change in magnitude or direction in the speed of an object, the object is said to be accelerating.

According to the question:

Velocity = Distance/ Time

Given in the question:

Distance= 200

Time= 0.5 minutes

Substitute the value,

Velocity= 200/0.5

Velocity = 400m/minute

Therefore, the velocity for the given question is 400m/minute.

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A hydrogen atom in the n=6 state decays to the n=3 state. what is the wavelength of the photon that the hydrogen atom emits? use hc=1240 nm ev.

Answers

The wavelength of a photon that the hydrogen atom emits is 1.093 x 10^-8 m.

The wavelength of a photon is given by the following formula,

1/λ = R{1/n1^2- 1/n2^2}

Here λ is the wavelength of the photon

R is the Rydberg Constant= 1.097 x 10^7 m

N1 is the initial state

N2 is the final state

Putting n1 =3, n2= 6 in the above equation, the wavelength lambda comes out to be,

1/λ = R{1/(3)^2 - 1/(6)^2}

λ = 12/1.097 x 10^7

Lambda = 1.093 x 10^-8 m.

Hence, the wavelength of the photon that the hydrogen atom emits is 1.093 x 10^-8 m.

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If a car travels 270 meters in 30 seconds, then what is its
average speed?

Answers

Answer:

9m/s

Explanation:

Speed = Distance ÷ Time

Distance=270meters

Time =30 seconds

270m

30s

=9m/s

The ability to buy a soda from a vending machine demonstrates which element of the marketing mix?

Answers

It demonstrates the place/distribution element.

Place, or its more popular name “distribution,” refers to the method by which a company delivers its goods to clients. It is one thing to have a fantastic product that is priced reasonably.

Which four forms of distribution are there?

Direct selling, selling through intermediaries, dual distribution, and reverse logistics channels are the four different categories of distribution channels.

What does distribution or place mean in marketing?

Distribution (or place) is one of the marketing mix’s four components. Making a good or service accessible to any consumer or any business user who is in requirement of it is the process of distribution.

The producer or service provider may carry this out directly or through indirect channels, such as distributors or intermediaries.

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Which statement is true about vectors?
a. All quantities in physics are not vectors.
b. A vector may have either magnitude or direction.
c. The vector’s length should be proportional to its magnitude.
d. Two vectors can be added only if they have the same direction.

Answers

Answer:

b. A vector may have either magnitude or direction.

Explanation:

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What is the main reason for searing a roast at a high temperature before finishing it at a lower temperature?

Answers

Prior to cooking, searing meats at high heat seals the pores, preserving the juices and preventing shrinking.

Why is a roast seared at a high temperature before being finished at a lower temperature?

A roast looks and tastes good when it is roasted at high temperatures (400°F and above). For thin, tender meats that depend on a flavorful, well-browned crust for flavor, such beef tenderloin and pork tenderloin, this approach works best.

Why is a roast seared in the first place?

If you want to produce the most delectable roasts, steaks, chops, and other meat dishes, searing the meat is a necessary step.

Meat is seared to caramelize the natural sugars and brown the proteins, resulting in a thick, nutty crust.

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Which would have the larger heat capacity, a large iron skillet or a small iron skillet?

Answers

A large iron skillet may hold more heat capacity than a small one because of its larger mass. Both skillet have the same specific heat because they are constructed of the same material.

A physical feature of matter known as heat capacity or thermal capacity is the quantity of heat that must be applied to an object in order to cause a unit change in temperature. J/K is the metric unit for heat capacity.

An extensive property is heat capacity.The heat is related to the substance's mass and the temperature change since the transferred heat is equivalent to the change in internal energy.

An object's mass and chemical makeup both affect its ability to hold heat. Therefore, a large iron skillet may hold more heat capacity than a small one because of its larger mass. Both skillet have the same specific heat because they are constructed of the same material.

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A workman stands on the roof of a 10 meter high building. Another worker tosses him a tool from the ground, which the first workman catches as the tool is falling to the ground. If the total time the tool is in the air is 2.5 seconds, what speed did the worker toss the tool into the air initially?

Answers

Answer:

4 Meters per second

Explanation:

This is assuming that the object is tossed straight up and without an angle since your question did not provide one

What are the magnitude and direction of electric field midway between these two charges?

Answers

No matter how far away or how large the charges are, the electric field in the middle of any two equal charges is always zero.

E is equal to Fe/q [where q is a positive test charge, Fe is the electric force vector, and E is the electric field vector].

According to the Coulomb Force, Fe = k Q q / r2,

and as a result, E = [K Q q / r2]/q

=K Q/r^2

Because similar charges repel one another, the field's orientation is away from the core charge.

The outcome is TWO FIELDS with the same magnitude but opposing directions, giving a value of ZERO.

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Suppose you are on a cart, initially at rest, which rides on a frictionless horizontal track. If you throw a ball off the cart towards the left, will the cart be put into motion?.

Answers

If you throw a ball off the cart towards the left then the cart will move to the left .

How the cart moved to the left and what phenomena was into consideration?The cart is initially at rest, but then rides on a frictionless horizontal track.Throwing a ball towards the left will obviously put the cart into motion.The cart will start moving in left because the ball was thrown left.To balance the momentum of the ball in the opposite direction the cart started moving towards the left.The phenomena to understand this is the law of conservation of momentum.

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Which cells have plasma membranes that undergo voltage changes in response to stimuli?

Answers

Neuron and muscle cells have plasma membranes that undergo voltage changes in response to stimuli.

What is a neuron?

Neurons are messengers of information.

Between various brain regions and between the brain and the rest of the nervous system, information is transmitted using electrical impulses and chemical signals.

A neuron has a cell body that includes a nucleus and cytoplasm, from which long, thin hair-like structures emerge.

The axon, a solitary long component of the neuron, is responsible for carrying the nerve impulse to various body areas.

The dendrites are the neuron's small, branching body sections.

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A gold atom has a radius of 145 pm. if you could string gold atoms like beads on a thread, how many atoms would you need to have a necklace 36.0 cm long?

Answers

[tex]1.17\times 10^{9 }[/tex]atoms would you need to have a necklace 36.0 cm long.

The radius of the gold atom = 145pm

The diameter of gold atom = 2[tex]\times[/tex]145pm

 = 290Pm  

[tex]=290\times10^{-10} cm[/tex]

gold atoms   = [tex]34cm/290\times10^{-10}cm[/tex]

= [tex]1.17\times 10^{9}[/tex] atoms  will be find in 36.0 cm necklace

Atomic radius is the distance from the nucleus to the edge of the atom

atomic radius decreases as we  go across the periodic table

electronegativity is ability of an atom to attract electrons when the atom is in a chemically combined compound

Atomic Radius : Group Trend: as we go down a column, atomic radius increases.

Periodic Trend: as we go across a period, (L to R), atomic radius decreases.

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An example of mechanical work is ________; an example of transport work is _______.

Answers

An example of mechanical work is the contraction of muscles; an example of transport work is the pumping of ions across the cellular membranes.

Generally, our cells can perform three major types of work which include chemical work, mechanical work as well as transport work.

A chemical work example is the building of proteins which are considered large molecules. The energy required for the dehydration synthesis reaction is provided by ATP which is able to link amino acids together.

One of the major examples of mechanical work is the activity of contraction of muscles. In the muscle cells, phosphate groups are transferred to certain proteins by ATP. These proteins are able to change the shape, which can start a series of events that makes the contraction of muscle cells.

On the other hand, a  transport work example includes the activity of pumping solutes including ions to pass across a cellular membrane. Here again, there will be a transfer of a particular phosphate group from ATP that makes the respective receiving membrane protein so as to change shape as well as enable ions to pass through effectively.

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A uniform solid sphere rolls down an incline. what must be the incline angle if the linear acceleration of the center of the sphere is to have a magnitude of 0.10 g?

Answers

The uniform solid sphere rolls down an incident angel for solid sphere is θ = 9.6 degree .

What is incident angel?

The angle of incidence in geometric optics is the angle formed between a ray incident on a surface and the normal, or line perpendicular to the surface at the point of incidence. Any wave, including optical, acoustic, microwave, X-ray, and others, can create a ray.

required acceleration = .12 g

The term for the acceleration of a rolling body on an inclined surface

= gsinθ / 1 + k² / R²

Here rolling body is sphere

k² = 2/5 R²

k² / R² = 2/5

acceleration = g sinθ / 1 + k² / R²

.10 g = g sinθ / 1 + k² / R²

.10 g =g sinθ / 1 + 2/5

.10 = sinθ / 1.4

sinθ = .168

θ = 9.6 degree .

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A heat engine operates in a carnot cycle between reservoirs of temperatures 1000 k and 400 k. it is found to discharge 20 j of heat per cycle to the cold reservoir. what is the work output per cycle?

Answers

A heat engine operates in a Carnot cycle between reservoirs of temperatures 1000 k and 400 k. it is found to discharge 20 j of heat per cycle to the cold reservoir, then the work done by the engine would be 60 joules.

What is a Carnot engine?

It is a hypothetical engine that is presumable to have the highest efficiency of all engines in the universe.

The Carnot engine is the most efficient engine available.

If a heat engine runs in a Carnot cycle between reservoirs with temperatures of 1000 k and 400 k, as stated in the issue. It is discovered that it releases 20 j of heat to the cold reservoir per cycle.

The efficiency of the engine = 1 - 400/1000

                                               =0.6

Heat supplied = heat rejected + work done

The efficiency of the engine = 0.6 = work done/Heat supplied

                                               0.6 = work done/heat rejected + work done

                                                0.6 =W / 20 + W

The work done = 60 joules

Thus, the work done by the engine would be 60 joules.

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A fertilised egg (zygote) has a diameter of 0.01 cm. At birth the average baby measures 50 cm in length. Calculate the change in order of magnitude of length from fertilisation to birth.

does anyone know the answer??​

Answers

Differences in size are often described as differences in the order of magnitude. That's the difference calculated in factors of 10.

At the time of fertilization-

0.01cm = 1/100 = [tex]10^{-2}[/tex]

At the time of birth-

50cm = 5 ×  [tex]10^{1}[/tex]

Meaning there is 3 order of magnitude between the egg(zygote) (0.01cm) and child after the birth ( 50cm ).

Notice that when dividing numbers in standard form, we subtract the powers.

When comparing orders of magnitude, actual distances can be approximated. It’s the relative difference that is important.

Hence, the change in the order of magnitude of length from fertilization to birth of a child is 3 ( three )

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Consider an incandescent lightbulb. If you wanted to turn a 10-w lightbulb into a 100-w lightbulb, how would you change the temperature of the filament inside the bulb?.

Answers

By using the blackbody radiation formula, the temperature of the filament inside the bulb is changed by a factor of 10⁰'²⁵.

We need to know about black body radiation to solve this problem. The energy radiated by a black body object is proportional to the area and the fourth power of temperature. It can be determined as

P = A . e . σ . T⁴

where P is power, A is surface area, e is emissivity, σ is Stefan Boltzmann's constant ( 5.67 x 10¯⁸ W/m²K⁴) and T is temperature.

From the question above, we know that

P1 = 10 watt

P2 = 100 watt

T1 = T1

By using the black body radiation formula, the ratio of temperature is

T1⁴ / T2⁴ = P1 / P2

Hence,

T1⁴ / T2⁴ = P1 / P2

T1⁴ / T2⁴ = 10 / 100

T1⁴ / T2⁴ = 1 / 10

T2⁴ = 10T1⁴

T2 = ⁴√(10T1⁴)

T2 = T1 x 10⁰'²⁵

Thus, the temperature of the filament inside the bulb is changed by a factor of 10⁰'²⁵.

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The escape speed from the moon is much smaller than from earth, around 2. 38 km/s. True or false?.

Answers

The statement is True.

What is the Escape speed of the Moon?

The Escape velocity of the Moon is 2.38km/s.

The conservation of energy and an energy field with a finite depth leads to the existence of escape velocity.

When moving under conservative forces (like a static gravity field), an object with a given total energy can only travel to combinations of locations and speeds that have that total energy; locations with higher potential energy cannot be reached at all.

The object's reachable locations increase as speed (kinetic energy) is added; with enough energy, the locations become infinite.

The minimum speed an object needs to travel at in order to "escape" gravity for a given gravitational potential energy at a given position is known as the escape velocity (i.e. so that gravity will never manage to pull it back).

Because it does not specify a direction of travel, escape velocity is actually a speed (not a velocity) and the object can escape the gravitational field in any direction (provided its path does not intersect the planet).

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The top speed of the blackbird is 2193 mph. given that 1 mile 1.61 km, what is this speed in km/h? (page 32).

Answers

The speed of 2193 mph expressed in km/h is: 3530.73 km/h

To solve this problem the we have to do the conversion of units with the given information.

Information about the problem:

v = 2193 miles/hv = expressed in (km/h) =  ?1 mile= 1.61 km

By converting the velocity units from  (miles/h) to (km/h) we have:

v = 2193 miles/h * 1.61 km/1 mile

v = 3530.73 km/h

What is unit conversion?

It is the transformation of a value expressed in one unit of measurement into an equivalent value expressed in another unit of measurement of the same nature.

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How many neutrons per second are emitted spontaneously from a 1 mg sample of 252cf?
2. how many neutrons per second are emitted spontaneously from a 1 mg sample of 248cm?

Answers

The number of neutrons per second are emitted spontaneously is [tex]2.3\times10^9[/tex] neutrons/mg-s.

An atom is made up of three distinct subatomic components. Protons, electrons, and neutrons are what they are. In an atom, protons and electrons are positively charged, while neutrons are uncharged or neutral entities. The masses and charges of each of these subatomic particles are known.

The number of atoms in 1 gm of Cf -  IS

[tex]N= (1g)(10^{-3})(6.02\times 10^{23} atoms/mol)/252 g/mol[/tex]

[tex]=2.38\times 10^{21} atoms/gm[/tex]

The number of neutrons released per each fission is 3.73 and the fission probability per decay is,[tex]3.09\times 10^{-2}[/tex]

[tex]=(3.73)(2.38\times 10^{21})(8.318\times10^{-9})(3.09\times10^{-2})[/tex]

[tex]=2.28\times 10^{12 }[/tex]neutrons/g-s

Therefore the number of neutrons per second are emitted spontaneously is,

 [tex]=2.28\times 10^{12 }[/tex]neutrons/g-s

[tex]=2.28\times 10^{12 }[/tex] neutrons/g-s([tex]10^{-3}[/tex]/1mg)

=[tex]2.13\times10^{9}[/tex] neutrons/mg-s

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Blood is accelerated from rest to a speed of 27.5 cm/s in a distance of 1.75 cm by the left ventricle of the heart. determine the magnitude of the acceleration of the blood.

Answers

The blood that travel from rest to a speed of 27.5 cm/s in a distance of 1.75 cm has an acceleration of: 216.07 cm/s²

The formulas and procedures we will use to solve this exercise are:

a = (vf² - vi²)/2 * x

Where:

a = accelerationvi = initial velocityvf = final velocityx = distance

Information about the problem:

vi= 0 cm/sx= 1.75 cmvf= 27.5 cm/sa=?

Applying the acceleration formula we have:

a = (vf² - vi²)/2 * x

a = [(27.5 cm/s)² - (0 cm/s²)] /2 * 1.75 cm

a = [756.25 cm²/s² - 0 cm²/s²] /3.5 cm

a = [756.25 cm²/s² ] /3.5 cm

a = 216.07 cm/s²

What is acceleration?

It is a physical quantity that indicates the variation of velocity as a function of time, it is expressed in units of distance per time squared e.g.: m/sec2 ; km/h2

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How do sub particles behave with each other

Answers

Answer:

The strong force binds quarks together within protons, neutrons, and other subatomic particles. Rather as the electromagnetic force is ultimately responsible for holding bulk matter together, so the strong force also keeps protons and neutrons together within atomic nuclei.

Explanation:

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Oil drips from a car at a rate of 1 drip every 0.1 second. Which of the patterns below would best represent the pattern of drips from the car if it were accelerating constantly?

Answers

The equally spaced dots shows a car if it were accelerating constantly.

What is acceleration?

The term acceleration has to do with the rate of change of the velocity of a body with time. We know that velocity is a vector quantity. This implies that both the magnitude and the direction of the velocity are all important. The same goes for acceleration. The acceleration is a vector quantity so both its magnitude and direction are deemed as important.

Now we know that if the acceleration is uniform or constant, the velocity would increase by equal amounts in equal time intervals. We now have to check out to see the cases in which the image suggests that the velocity changes by equal amounts in equal time intervals.

Looking at the image as attached, the dots are equally spaced. The equal spacing of the dots shows us the way and manner in which the velocity of the car increases. Thus the image attached shows us that the velocity does increase by equal amounts in equal time intervals.

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The first telescopic photo shows what appears to be a single star. The second photo shows the same object, now revealed to be two distinct stars. What is the difference between the two photos?.

Answers

Explanation:

i think the second picture is smaller and has a better angular resolution

In second photo, there has more resolution than that of first photo.

What is resolving power?

The ability of an optical equipment to discern between two things that are close to one another and produce distinct images of the two items is known as its resolving power.

To put it simply, when viewed through an optical instrument, resolving power varies inversely with the distance between the two objects to be resolved. As a result, when viewed from the device, the images of two things that are close to one another should appear distinct and separate.

Consider using a telescope to observe two stars that are close to one another; the telescope's resolving power depends on its capacity to distinguish between the pictures of the two stars.

According to the question, second telescope can detect two stars separately but first one can't because the resolving power of the second telescope is greater than that of first one. That's way, the difference between the two photos is that second photo is with greater resolution.

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If its volume remains unchanged, what will its pressure be at the temperature at which co2co2 solidifies?

Answers

The pressure for CO₂ will be 0.75atm when volume remains unchanged.

What is pressure?

The force delivered perpendicularly to an object's surface per unit area across which that force is dispersed is known as pressure. In comparison to the surrounding pressure, gauge pressure is the pressure. Pressure is expressed using a variety of units.

PV = nRT

[tex]\frac{P_{1} }{T_{1} } = \frac{P_{2} }{T_{2} }[/tex]

[tex]P_{1} = \frac{1.05atm}{273K} * (194.5K)[/tex]

P1 = 0.748atm

which on round figure gives us,

P1 = 0.75 atm

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Niobium (nb) has a bcc crystal structure, an atomic radius of 0.143 nm, and an atomic weight of 92.91 g/mol. compute and compare its theoretical density with the experimental value.

Answers

Both the theoretical density and experimental value is 8.57g/cm3

The term crystal structure, in crystallography, denotes that the structure in which the atoms (ions or molecules) are attached are arranged in an ordered manner. The smallest repeating unit of the crystal structure is called a unit cell.

Given that:

The radius of Nb is given as R=0.1430nm

The density of Nb is given as d=8.57g/cm3

The atomic weight of Nb is given as M=92.91g/mol

Also, given that the structure is BCC.

The value of the number of atoms per unit cell in BCC is Z=2

The formula for the edge length of BCC structure is,

a=4R/(√3)

Substitute the given values

a=(4*0.1430 nm)/(√3)

=3.3024×10−8cm

The formula for the density of the Nb in BCC structure is,

d2=(Z×M)/(a3×NA)

Substitute the given values.

d1=(2×92.91g/mol)/((3.3024×10-8cm)3 × 6.022 × 1023 mol-1)

=(185.82g/mol)/(21.68cm3/mola3×NA)

=8.57g/cm3

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An incandescent light bulb has a power rating of 40 w when connected to a wall outlet of voltage 120 v. the resistance of the filament in the light bulb is?

Answers

An incandescent light bulb has a power rating of 40 w when connected to a wall outlet of voltage 120 v. the resistance of the filament in the light bulb is 360 ohms.

The relation between power, voltage and current is :

                                   P =VI ...(i)

According to Ohm's law:

                                  I =V/R

Substituting the value of I in power relation

                                  P = [tex]V^{2}[/tex]/R

Since we have to find the resistance

                               R = [tex]V^{2}[/tex]/P ...(ii)

Given:

V = 120 V

P = 40 w

Putting the values in eq (ii).

R = [tex]120^{2}[/tex]/40

R = 360 Ω

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Steve came to the meeting, however he had to leave earlier. Is this sentence correct? What is the fundamental difference between the feedback mechanism involving oxytocin and birth and the mechanism involving insulin and blood sugar? What is the percentage change in the price of each bond if its yield to maturity falls from to ? How does the current health it structure at your institution support or hinder the effectiveness of informatics specialists in nursing, medicine, and other disciplines?. (PLEASE HELP!!)Solve the following system of equations using either Gaussian elimination or a matrix. Write your answer as a point and explain how you would check your work: 2xy + 4z = 33 x + 2y - 3z = -26 -5x - 3y + 5z = 23 In the interview in the ""introduction to marketing""-lecture on 09/13/22 a company representative of fidelity described how fidelity segments their markets. Based on which factors does fidelity segment their markets?. 13. Where did the Spanish settlers form their first permanent community in Texas? 1.los adaes2.houston 3.santa fe4. corpus christi de la ysleta 5 What two points are a distance of 7 units from thepoint 4 on the number line?A.3 and 11B.-3 and 11C. -3 and -11D. 3 and -11 What contingency factors might affect theplanning a business managers have todo? In 1919, the u. S. Senate refused to ratify the treaty of versailles and join the league of nations. Their main objection to joining was that they feared the league would. The nurse is creating a plan of care for a client scheduled for surgery. the nurse should include which activity in the nursing care plan for the client on the day of surgery? What is f(-3) for the function f(x)=-3 x+6 ? Given f(x)=x- 5x + 6, what is the value of f(-3.5)? If the measure of angle 1 = (7x-19), and the measure of angle 2 = (x+5) find the measure of angle 2 Within a water molecule, the electrons spend most of their time attracted more closely to? Select the correct answer.Which of the following nations had a command economy?OA the United StatesOB. BritainOC the Soviet UnionOD. FranceOE. Belglum Find 1, 305 x 81. Then estimate to check your answer. A. 1, 305 x 81 = 85, 705 Check: 1,000 8 = 80,000 B. 1, 305 x 81 = 105, 705. Check: 1,400 x 90 = 12, 600 : C. 1,305 x 81 = 105, 705 Check: 1, 200 80 = 96,000 D. 1, 305 x 81 105, 705 Check: 1,300 x 80 = 104, 000 What will be the potential energy of a body if its mass is 30 kg and located 30m high from the ground? SE Can somebody help me please hurry 5. A city has a population of 350,000.Thepopulation has decreased by 30% in the pastten years. What was the population of the cityten years ago?