45.90kg mass of sucrose, would be needed to obtain the same freezing point when dissolved in 200 g of water as 5.00 g of KCl.
We can obtain the freezing point of solution using:
Δ[tex]T_{f}[/tex] = i × [tex]K_{f}[/tex] × m
[tex]m = \frac{moles}{volume of solvent in kg}[/tex]
[tex]m = \frac{mass/molarmass}{0.2}[/tex]
[tex]m = \frac{5/74.55}{0.2}[/tex]
m = 0.3353moles/kg
Now, Δ[tex]T_{f}[/tex] = i × [tex]K_{f}[/tex] × m
Δ[tex]T_{f}[/tex] = 2 × (-1.86) × 0.3353
Δ[tex]T_{f}[/tex] = -1.2473°C
Now, for obtaining mass of sucrose , using the same formula of freezing point we get:
Δ[tex]T_{f}[/tex] = i × [tex]K_{f}[/tex] × m
-1.2473 = 1 × (-1.86) × [tex]\frac{mass/342.3}{0.2}[/tex]
-1.2473 = -1.86 × [tex]\frac{mass/342.3}{0.2}[/tex]
-1.2473 = -1.86 × [tex]\frac{mass}{68.46}[/tex]
mass = 45.90kg
Therefore, 45.90kg mass of sucrose, would be needed to obtain the same freezing point when dissolved in 200 g of water as 5.00 g of KCl.
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A ball is dropped from rest from a cliff. after one second, about how quickly is the ball traveling if you neglect air resistance?
The ball dropped from rest from a cliff after one second will have a final velocity of: 9.8 m/s
The free fall formula and the procedure we will use is:
fv = g* t
Where:
fv = final velocityg = acceleration due to gravityt = time takenInformation of the problem:
g = 9.8 m/s².t = 1 sfv = ?Applying final velocity formula we get:
fv = g* t
fv = 9.8 m/s² * 1 s
fv = 9.8 m/s
What is free fall?It is when the object or mobile falls from a height (h) with a positive acceleration equal to the gravity, describing a vertical rectilinear travel.
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A block is released from rest and slides down a ramp. The surface of the ramp has three rough sections where the friction between the surface and the block is not negligible, as shown by the shaded regions above. Measuring which of the following will allow for the best estimate of the block’s instantaneous acceleration when the block is at the midpoint of the ramp?
The speed of the block at points just before and just after the midpoint and the time its takes the block to travel between them.
What is acceleration ?The rate at which speed and direction of movement change over time is referred to as acceleration. When something moves faster or slower, it is said to be accelerating. Motion on a circle increases even while the speed is constant because the vector is always changing.
What is an object's acceleration?According to Newton's second law of motion, an object's acceleration is equal to the net force applied to it divided by its mass, or a = F m. Given an object's mass and the net pressure exerted on it, one can use this acceleration equation to calculate its acceleration.
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The net force on a moving object suddenly becomes zero and remains zero. the object will:_________-
If the net force on an object becomes zero and remains zero, the object will continue to move at constant velocity.
The net force acting on a body is the addition or the resultant of all the forces acting on the body. When the net force acting on a body is more than zero, it causes motion, but when it is zero, the object will remain at rest or will continue moving with uniform velocity.
This is in line with Newton's first law of motion which states that "a body will continue in its state of rest or will continue to move with uniform velocity unless it is acted upon by a force".
Thus, when the net force on a moving body becomes zero, it will not slow down or speed up, it will continue to move at the same speed. An example of this is when the passengers of a moving car fall forward when the car suddenly comes to a stop.
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Certain heavy industrial equipment uses ac power that has a peak voltage of 703 v. what is the rms voltage?
The RMS voltage of certain heavy industrial equipment is calculated as = 497.09 V . Ac power that has a peak voltage .
Evaluating :
RMS = [tex]\frac{V_{pk} }{\sqrt{2} } = \frac{703}{\sqrt{2} } \\\\[/tex]
= 497.09 V .
Simplification :
As the a c current fluctuates, the typical voltage can be computed in terms of the big voltage as using the following equation. Where v r m s is that the average voltage v. Big is that the peak voltage, so this is often the maximum voltage that can be derived from an a c power, therefore the relationship is p r m s equals v peak over square of 2. as long as the peak voltage is equal to 703 volts, we wish to seek out the v r m s. So we're just visiting divide the pick voltage by spirit of 2, which gives us the r m s of 703 over of 2, and this is often 497 point and the unit is same as the piquant, which is volts. So i hope everything is square.
What is RMS voltage ?
RMS or root mean square current/voltage of the alternating current/voltage represents the d.c. current/voltage that dissipates the identical amount of power as the average power dissipated by the alternating current/voltage. For sinusoidal oscillations, the RMS value equals peak value divided by the root of 2.
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4. Which is a NOT a unit for speed? (4 points)
1.cm/min
2.km/h
3.m/s
4.km
A metal cube has a mass of 10 grams, and occupies 5 cubic centimeters of space.
What's its density?
Answer:
ρ (density) = M / V mass / unit volume
ρ = 10 g / 5 cm^3 = 2 g/cm^3 density of the metal
Which student's plate is following the MyPlate recommendations?
Ashley has toast, a bowl of cereal, a granola bar, and a glass of juice.
Brian has pasta, a green salad, grilled chicken, and a glass of milk.
Kendra has yogurt, ice cream, an apple, and a glass of milk.
Megan has cookies, carrots, a piece of cake, and soda.
Brian is following the MyPlate recommendations because he has pasta, a green salad, grilled chicken, and a glass of milk.
Fruits and vegetables should take up half of the plate, according to MyPlate. The two basic categories of grains are whole grains and processed grains.Fruits, vegetables, grains, proteins, and dairy make up the bulk of the MyPlate dietary groups. Apples, grapes, oranges, berries, carrots, onions, maize, peas, bell peppers, and mushrooms are just a few examples of fruits and vegetables that are low in calories, rich in fiber, and deficient in potassium in the typical American diet. It includes antioxidant phytonutrients in addition to bone-building elements including potassium, calcium, magnesium, vitamin K, and vitamin C.To know more about MyPlate visit : https://brainly.com/question/14369091
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Answer:
B) Brian has pasta, a green salad, grilled chicken, and a glass of milk.
Proof:
An object initially at rest experience an acceleration of 9.8m/s/s. How much time will it take it to achieve a velocity of 58m/s
Answer: 5.91836735
Explanation:
For a problem such as this you would use the equation:
V final = V initial +(A*T)
V final = 58 m/s
V initial = 0 (b/c object begins at rest)
A (acceleration) = 9.8 m/s/s
T (time) = X
Time is our unknown variable so you would begin by plugging in your equation with the variables given, which would be:
58 m/s = 0 + (9.8 m/s/s * X)
Then you isolate X by doing:
58 m/s = 0 + (9.8 m/s/s * X)
-0 -0
58 m/s = 9.8 m/s/s * X
(58/9.8)
Getting: 5.91836735 seconds = X as your answer
HELP ME! WILL GIVE BRAINLIEST!
Answer:
Synthesis(Two substances that react to form one product): A + C -> AC
Decomposition(A compound that breaks down into two+ more substances): AB -> A + B
Single Replacement(replaced by another substance): A + BC -> AC + B
Double Replacement(Two substances replaced): AB + CD -> AD + CB
Combustion(A reaction between oxygen and another substance such as water) : CH + O2 -> CO2 + H2O
So that would mean that
[tex]H_{2}O + SO_{3} - > H_{2}SO_{4}= Synthesis 2H_{2}O_{2} - > 2H_{2}O + O_{2} = DecompositionPb(No_{3})_{2} + 2KI - > 2KNO_{3} + PbIx_{2} = Replacement C_{3}H_{8} + 50_{2} - > 3C0_{2} + 4H_{2}O - Combustion[/tex]
Explanation:
A unit of mass of steam is expanded in a cylinder in such a manner that no energy is added or lost as heat. what is this process called?
Adiabatic process is the process where a unit of mass of steam is expanded in a cylinder in such a manner that no energy is added or lost as heat.
A thermodynamic process known as an adiabatic process takes place when there is no exchange of mass or heat between the thermodynamic system and its surroundings. An adiabatic process, as contrast to an isothermal process, solely transfers energy as work to the environment.
The adiabatic process is a fundamental idea in thermodynamics and supports the theory behind the first law of thermodynamics.
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A car drives at 25 m/s and speeds up to 30 m/s in 2 s. What is the acceleration of the car?
A +15 m/s²
B +12.5 m/s²
C +27.5 m/s²
D +2.5 m/s²
If the plane has a mass of 1380 kg and a wing area of 16.2m^2. What is the magnitude of the net vertical force (including the effects of gravity) on the airplane? The density of the air is 1.20 kg/m^3.
the magnitude of the net vertical force (including the effects of gravity) on the airplane is = 10491.2 N
Evaluating :Magnitude of net vertical force on airplane
= 68 × 16.2 m³/s
volume of air under the surface
= 58 × 16.2 m³/s
total upward thrust by air
=[ 68 + 58 ] × 16.2 m³ /s× 1.20 kg/m³ × 9.81
= 24029 N
Weight =1380 × 9.81
=13537.8
the magnitude of the net vertical force (including the effects of gravity) on the airplane
= 24029 - 13537.8
= 10491.2 N
Net vertical force :The net force is the vector sum of all the forces that react on an object. That is to say, the net force is the total sum of all the forces, taking into account the fact that a force is a vector and two forces of same magnitude and opposite direction will cancel each other out
What is meant by net force?
In mechanics, the web force is the vector sum of forces acting on a particle or object. the web force is a single force that replaces the effect of the original forces on the particle's motion. It gives the particle the identical acceleration as all those actual forces together as described by Newton's second law of motion.
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What kind of kinship ties exist between a father-in-law and his son-in-law?
OA. affinal
OB. consanguineous
OC. fictional
OD. descent
Answer:
A. affinal
Explanation:
Once a marriage has produced offspring, in-laws become affinal relatives who are defined not only by the order of law but also by their recognition of a biological link to the child.
Who is credited with developing a formula that predicted all of hydrogen's emission lines, including those outside of visible range?
Johannes Rydberg is credited with developing a formula that predicted all of hydrogen's emission lines, including those outside of visible range.
In atomic physics, the Rydberg formula calculates the wavelengths of a spectral line in many chemical elements. The formula was primarily presented as a generalization of the Balmer series for all atomic electron transitions of hydrogen. Rydberg's research was preceded by Johann Jakob Balmer's, who presented an empirical formula for the visible spectral lines of the hydrogen atom in 1885.However, Rydberg's research led him to publish a formula in 1888 which could be used to describe the spectral lines not only for hydrogen but other elements as well. Johann Jakob Balmer's was on developing a formula that predicted all of hydrogen's emission lines within the visible range, but Rydberg’s work took account of hydrogen’s emission lines outside the visible range.
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What is the symbol, atomic number, # of protons, # of electrons, atomic mass, rounded atomic mass, # of neutrons (show work), and period of: iron
The symbol of the element Iron is Fe, its proton number is 26, its atomic mass is 56, its electron number is 26 and finally Iron belong to period 4 of the periodic table.
What is an Element?This is defined as a substance cannot be further broken down by any chemical reaction and examples include oxygen, nitrogen etc.
Iron is an element and has an atomic number of 26 with a mass number of 56 and is present in period 4 in the periodic table.
For all atoms with no charge, the atomic number is equal to the number of proton. The number of proton is also equal to the number of electron which is why they all have the same value of 26.
Neutron = atomic mass - atomic number
= 56 - 26 = 30
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The density of lead is 11.3 g/cm3. what is the mass of a block of lead 20.0 cm high by 30.0 cm long by 15.0 cm deep?
The mass of the block is 101,700g.
The mass of an object divided by its volume is the formula for determining density. This is expressed mathematically as d = m/v, where d denotes density, m denotes mass, and v denotes object volume. The common measurements are kg/[tex]m^{3}[/tex].
Density = mass / volume
where, volume = l×b×h
volume = 20×30×15
volume = 9000[tex]cm^{3}[/tex]
Now, Density = mass / volume
11.3 = mass / 9000
mass = 101700g
Therefore, the mass of the block is 101,700g.
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What type of light on the electromagnetic spectrum has the highest energy per photon?.
Answer:
Gamma rays have the highest energies
Explanation:
please make my answer as brainelist
Two ideal gases, a and b, are at the same temperature. if the molecular mass of the molecules in gas a is twice that of the molecules in gas b, the molecules' root-mean-square speed is?
The molecules' root-mean-square speed is R = 8.31 J/(mole⋅ K)
Thermal Motion:Molecules in any object are in constant motion, the speed of that motion being defined by the temperature of the thing . just in case of ideal gases, the speed of motion is that the function of the temperature and the molar mass of the gas only.
Evaluation :The root mean square speed of the molecules in the gas is given by: vrms =√3 RT/M
Here,
T is the temperature of the gas;
R = 8.31 J/(mole⋅ K) is the universal gas constant;
M is the molar mass of the gas;
Since the molecular mass of the gas A is twice as large and therefore the speed is inversely proportional to the square root of the molar mass, the speed of molecules in B is bigger by the factor √2 ≈ 1.4
What is molar mass?
The molar mass (symbol M, SI unit kg·mol−1) is defined because the mass per unit amount of substance of a given chemical entity. keep with the definition of the mole, the chemical entity in question should be specified
What is molar mass and mole?
The molar mass of a substance is defined because the mass of 1 mol of that substance, expressed in grams per mole, and is adequate to the mass of 6.022 × 10²³ atoms, molecules, or formula units of that substance
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A cannonball is launched horizontally off a 65 m high castle wall with a speed of 40 m/s. how long will the cannonball be in the air before striking the ground?
The cannonball will be in the air a time of: 3.6421 s
The horizontal launch formula we will use and the procedure is:
t = √((2 * h) / g)
Where:
t = timeh = heightg = gravityInformation about the problem:
h= 65 mg = 9.8 m/s²v= 40 m/st =?Applying the time formula we have:
t = √((2 * h) / g)
t = √((2 * 65 m) / 9.8 m/s²)
t = √(130 m / 9.8 m/s²)
t = √(13.2653 s²)
t = 3.6421 s
What is horizontal launch?Is the motion described by an object that has been thrown horizontally with no angle of inclination at a certain height and considers the effect that the force of the earth's gravity has on the thrown object.
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How much standard benzoic acid (fm 122.12, density = 1.27 g/ml) should you weigh out to obtain a 100.0 mm aqueous solution of 250 ml?
A solution's concentration is a measure of how much solute has been dissolved in a given quantity of solvent or solution. A concentrated solution contains a significant amount of dissolved solute. In other words, it is the number of moles per unit volume of a solution. The standard unit for concentration is Molar or mol/dm3.
Given that:
Mass = x?
molar mass = 122.12
density = 1.27 g/ml
concentration = 100 mM = 0.1 M
volume = 250 ml
Since n = cv
And n = mass/ molar mass
Therefore,
mass/molar mass =concentration * volume
x/122.12 = 0.1 * 250
X = 3,053g
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Explain what reaction time has to do with freefall:
Answer: time is inversely proportional to acceleration and free-falling bodies have acceleration.
Explanation:
according to the first equation of motion ;
a=V-v/t
where V is the final velocity and v is the initial velocity. putting the value of a as g we get;
g=V-v/t
shows the relation of g and t(gravitational acceleration and time) of free-falling bodies.
The amplitude of a lightly damped oscillator decreases by 4.0 uring each cycle. what percentage of the mechanical energy of the oscillator is lost in each cycle?
Percentage of the mechanical energy of the oscillator is lost in each cycle is 8%
The mechanical energy can be written as the maximum kinetic energy. Hence,
E=Kmax
=12mv²
|\E=12mA²ω² .........(i)
On differentiating, we get
/dE=mAω²dA…. /(ii)
Dividing eq.(ii)by equation(i), we get
dEE(mechanical energy) =mAω²dA (1/2) mA²ω²
=2dAA
=2(4.0%)
=8.0%
The difference between the mean or equilibrium position and either extreme is the oscillation's amplitude. The particle oscillates completely back and forth from its mean position
Mechanical energy is the energy that is obtained by the things that do the work. The energy that an object possesses as a result of its motion or position is known as mechanical energy. Kinetic energy, or the energy of motion, and potential energy are two types of mechanical energy (stored energy of position)
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A climber whose mass is 51 kg hangs motionless from a rope. what is the tension in the rope?
The tension in the rope which a climber, that has a mass of 51 kg, is hang motionless is 499.8 N
The tension formula and the procedure we will use is:
T = m * g
Where:
T = tensionm = massg = gravityInformation of the problem:
T = ?m = 51 kg g = 9.8 m/s²Knowing that the body is in equilibrium the tension of the rope is equal to the gravity force. Applying the tension formula and substituting values we have:
T = Fg
Fg = m * g
Fg = 51 kg * 9.8 m/s²
Fg = 499.8 N
What is force?It is the physical magnitude that expresses the effort necessary to move the mass of one kilogram with an acceleration of one meter per second squared, this is expressed in units of the international system in Newton.
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