How many gram of coffee mut evaporate from 750 g of coffee in a 120 g gla cup to cool the coffee from 95. 0°C to 48. 0°C? You may aume the coffee ha the ame thermal propertie a water and that the average heat of vaporization i 2340 kJ/kg (560 cal/g). (You may neglect the change in ma of the coffee a it cool, which will give you an anwer that i lightly larger than correct. )
Answers
65 grams of coffee must evaporate.
Here, we use the formula of heat transfer
Heat loss by the system = heat gain by the system
We need to calculate the heat loss by the coffee and glass itself individually
Heat loss by glass
Heat loss by glass = mass of glass * specific heat capacity *change in temperature
= (120/1000 Kg)* (840)* (48 - 95)
= - 4737.6 J
Heat loss by the glass is -4737.6 J
Similarly we calculate heat loss by coffee
Heat loss by coffee = mass of coffee * specific heat capacity * change in temperature
= (750/1000 Kg) * ( 4184) *( 48 - 95)
= - 147486 J
Heat loss by coffee is - 147486 J
Total heat loss = Heat loss by coffee + Heat loss by glass
= -152223.6 J
evaporation of liquid = Amount of heat loss
Mass of evaporation * Latent heat = 152223.6 J
Mass of evaporation = 152223.6 / 2340*1000
Mass of evaporation = 0.06505 Kg = 65.05 gram
Hence, 65 grams of coffee evaporates.
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Related Questions
2. A cinder block is sitting on a platform 20 m high. It weighs 16kg. The block has
_ joules of potential energy.
Answers
Answer:
3136 Joules
Explanation:
Applying,
P.E = mgh.............. Equation 1
Where P.E = potential energy, m = mass of the cinder block, h = height of the platform, g = acceleration due to gravity.
From the question,
Given: m = 16 kg, h = 20 m
Constant: g = 9.8 m/s²
Substitute these values into equation 1
P.E = 16(20)(9.8)
P.E = 3136 Joules
Hence the potential energy of the cinder block is 3136 Joules
Why is velocity proportial to pressure?
Answers
Answer:
Pressure and velocity are inversely proportional to each other because if pressure increase, the velocity decrease to keep the algebraic sum of potential energy, kinetic energy and pressure constant.
a wave having a wavelength of 4.7 meters and an amplitude of 2.5 meters travels a distance of 28 meters in 7 seconds. determine the frequency and period of the wave
Answers
Answer:
T(Period) = 1.33sf(Frequency) = 0.75Hz (cycles/second)Explanation:
Given:λ = 4.0mAmplitude = 25md = 24ms = 8.0sRequired:f = ?T = ?Analysis:v = λff =N/tT = 1/fv = d/tSolve:v = d/t = 24/8.0 → v = 3.0m/sv =λf → f = v/λ = 3.0/4.0 → f = 0.75HzT = 1/f = 1/0.75 → T = 1.33sHopes this helps. Mark as brainlest plz!an aiplane is traveling at 500 mph for 3.5 hours. how far did the plane travel
Answers
Answer:
1750mile
Explanation:
500/h
3.5h=3.5×500=1750
why does the sky appear blue in the day vs. red during sunset? I’m looking for an answer that explain s using light rays!!
Answers
Rayleigh scattering makes the sky appear blue in the day and red during sunset.
A clear, cloudless daytime sky is blue because molecules in the air scatter blue light from the sun more than red light. Sun at sunset, appears red or orange because blue light is scattered from your line of sight.
The white light of the sun is a mixture of all the colors of the rainbow. This was demonstrated by Isaac Newton by using a prism to separate different colors to form a spectrum. Colors of light are distinguished by different wavelengths.
The visible portion of the spectrum ranges from red light with a wavelength of about 720 nm to violet with a wavelength of about 380 nm, with orange, yellow, green, blue, and indigo in between. Her three types of color receptors in the retina of the human eye are most responsive to red, green and blue wavelengths, giving us color vision.
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can someone put these in the right order please
Answers
If
you weigh 140 pounds, what is your weight in kilograms
Answers
how to find vertical displacemetn of a charge as it moves along an eletric frield
Answers
The process involves determining the acceleration of the charge, calculating the time of motion, and then using the equations of motion to find the vertical displacement.
Here are the steps you can follow:
Identify the relevant information: Determine the charge of the particle (q), the strength and direction of the electric field (E), the initial velocity of the particle (v₀), and the initial vertical displacement (y₀) if applicable.Calculate the force on the charge: The electric force (F) acting on a charge in an electric field is given by the equation F = qE, where q is the charge and E is the electric field strength.Determine the acceleration: Use Newton's second law, F = ma, where m is the mass of the charge. Since the charge of a particle is typically very small, the mass can be ignored, and the equation simplifies to F = ma = qE. Thus, the acceleration (a) of the charge is a = qE/m.Calculate the time of motion: If you know the initial velocity (v₀) and the acceleration (a), you can calculate the time (t) it takes for the charge to move through the electric field using the equation v = v₀ + at. Rearrange the equation to solve for t: t = (v - v₀) / a.Find the vertical displacement: Once you have the time of motion (t), you can find the vertical displacement (Δy) using the equation Δy = y - y₀ = v₀t + (1/2)at², where y is the final vertical displacement.Learn more about displacement here : brainly.com/question/11934397
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how do i get the correct answer for 0.429m to mm
Answers
the answer for 0.429m to mm is 429
Answer:
0.429m=429 mm
Explanation:
Since there are 1,000 millimeters per meter, you need to multiply by 1,000 to convert from meters to millimeters.
Two aliens in another universe travel in spacecrafts that start of moving perfectly parallel to each other. The spacecraft send signals to each other to measure the distance between them. After travelling for millions of years, the aliens observe that the spacecraft are getting further apart even though neither spacecraft has changed its direction. What can we conclude
Answers
We can conclude that the space between the two spacecraft is expanding, indicating that the universe in which they exist is undergoing a process known as cosmic expansion.
The observation that the spacecraft are getting further apart without changing their directions suggests that the space itself is expanding. This phenomenon is a key feature of cosmic expansion, which is the stretching of space on a large scale. In our universe, this expansion is described by the theory of general relativity.
According to the theory, the expansion of space causes the distance between distant objects to increase over time. As the universe expands, the fabric of space itself stretches, causing the separation between objects to grow. This expansion is not due to the spacecraft moving away from each other, but rather the space between them expanding.
The observation that the spacecraft are getting further apart over millions of years indicates that the cosmic expansion is ongoing. This finding aligns with the current understanding of our own universe, where distant galaxies are observed to be moving away from each other as a result of cosmic expansion.
Therefore, based on the observation of the spacecraft getting further apart without changing their directions, we can conclude that the universe in which the aliens exist is undergoing cosmic expansion.
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A book is placed on a table and a bike moves on a road. Which statement is correct? (3 points)
Answers
The book has potential energy (Pe) and the bike has kinetic energy (Ke).
Answer:
C
Explanation:
The book has potential energy and the bike has kinetic energy.
Consider a particle constrained to move in the x−y plane. One state the particle can be in has the following wavefunction in the x−y position representation: ψ(x,y)=Nexp{− 2σ 2
x 2
}exp{− 2σ 2
y 2
}, shere N is a normalization coefficient and σ is a length scale. A different possible state has the vavefunction φ(x,y)=Nexp{ ℏ
iay
}exp{− 2σ 2
(x−d) 2
}exp{− 2σ 2
y 2
}. a) For ψ(x,y), give the expectation values ⟨ X
^
⟩,⟨ Y
^
⟩,⟨ P
^
x
⟩, and ⟨ P
^
y
⟩, which correspond to expecation values of the position and momentum operators for the x and y directions. b) For φ(x,y), give the expectation values ⟨ X
^
⟩,⟨ Y
^
⟩,⟨ P
^
x
⟩, and ⟨ P
^
y
⟩.
Answers
Expectation value of position in the x-direction, ⟨X^⟩: We apply the position operator, X^, to the wavefunction and integrate:
⟨X^⟩ = ∫ xψ(x, y) dx dy = ∫ xNexp(-2σ^2x^2)exp(-2σ^2y^2) dx dy
To find the expectation values for the position and momentum operators, we need to apply the corresponding operators to the wavefunctions and integrate over the appropriate variables.
a) For the wavefunction ψ(x, y) = Nexp(-2σ^2x^2)exp(-2σ^2y^2):
Expectation value of position in the x-direction, ⟨X^⟩: We apply the position operator, X^, to the wavefunction and integrate:
⟨X^⟩ = ∫ xψ(x, y) dx dy
= ∫ xNexp(-2σ^2x^2)exp(-2σ^2y^2) dx dy
Similarly, we can find the expectation values ⟨Y^⟩, ⟨P^x⟩, and ⟨P^y⟩ by applying the respective operators and integrating over the variables x and y.
b) For the wavefunction φ(x, y) = Nexp(iay)exp(-2σ^2(x-d)^2)exp(-2σ^2y^2):
We follow the same procedure as in part a) to find the expectation values ⟨X^⟩, ⟨Y^⟩, ⟨P^x⟩, and ⟨P^y⟩ for the wavefunction φ(x, y).
The expectation values provide us with information about the average positions and momenta of the particle in the x-y plane for each wavefunction. By calculating these expectation values, we can gain insights into the behavior and properties of the particle in the given states.
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Which of the following is a compound? A)oxygen B)water C)nitrogen D)hydrogen
Answers
Answer:
water
Explanation:
water is a compound
An experiment is conducted such that an applied force is exerted on a 5kg object as it travels across a horizontal surface in which frictional forces are NOT considered to be negligible. A graph of the net force exerted on the object as a function of the object’s distance traveled is shown. How could a student use the graph to determine the net work done on the object?
Answers
If an experiment is conducted such that an applied force is exerted on an object, a student could use the graph to determine the net work done on the object.
The graph of the net force exerted on the object as a function of the object’s distance traveled is attached below.
A student could use the graph to determine the net work done on the object by Calculating the area bound by the line of best fit and the horizontal axis from 0m to 5mFor more information on work done, visit
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Answer:
D. There is not enough information that is known or can be obtained from the graph to determine the net work done on the object.
Explanation:
it’s the answer For Ap classroom
in a simple electric circuit, ohm's law states that , where v is the voltage in volts, i is the current in amperes, and r is the resistance in ohms. assume that, as the battery wears out, the voltage decreases at 0.04 volts per second and, as the resistor heats up, the resistance is increasing at 0.04 ohms per second. when the resistance is 300 ohms and the current is 0.04 amperes, at what rate is the current changing?
Answers
When a problem's variables further depend on other variables like time, related rates are used.
What is V, in terms of Ohm's law?The Equation of Ohm's Law: V = IR, where V is the voltage that is applied across the conductor, I is the current that is passing through the conductor, and R is the conductor's resistance to the current flow.
The chain rule can be used to relate the rate of change of z with respect to t to the rates of x and y with respect to t when Z=f(x, y) and the variables x and y themselves depend on the variable t.
When all other rates and variables are known, we can use these relations to determine the rate of any one variable.
Take note that when the variable z changes with respect to t, we get dz/dt0, and when z changes with respect to t, we get dz/dt>0.
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A boat moves initially at 10 m/s, then accelerates at 2 m/s^2 for 10 s. What is the velocity of the boat after 10 s?
Answers
Answer:
30 m/s
Explanation:
A boat moves initially at 10 m/s
The boat accelerates at 2 m/s^2 for 10 seconds
We are required to calculate the final velocity (v)
Therefore the velocity of the boat can be calculated as follows
v = u + at
u= 10 m/s
a= 2 m/s^2
t= 10 seconds
v= 10 + 2(10)
v= 10 + 20
= 30 m/s
Hence the velocity of the boat after 10 seconds is 30 m/s
Find the horizontal magnitude of a velocity vector of 125 m/s at an angle of 70°.
______ m/s (round to tenths place)
Answers
Answer:
please find attached file
Explanation:
An object falling through space by the force of gravity reaches a terminal velocity speed of:_____.
Answers
An object falling through space by the force of gravity reaches a terminal velocity speed of 9.8m/\(s^{2}\)
Terminal velocity Near the surface of the Earth, any object falling freely will have an acceleration of about 9.8 metres per second squared (m/s2).
What is Terminal Velocity?
Terminal velocity is the maximum velocity (speed) attainable by an object as it falls through a fluid (air is the most common example).
It occurs when the sum of the drag force (Fd) and the buoyancy is equal to the downward force of gravity (FG) acting on the object.
Since the net force on the object is zero, the object has zero acceleration.
At terminal velocity, the object moves at a steady speed in a constant direction because the resultant force acting on it is zero.
In fluid dynamics an object is moving at its terminal velocity if its speed is constant due to the restraining force exerted by the fluid through which it is moving.
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1. Determine the energy released per kilogram of fuel used.
Given MeV per reaction, calculate energy in joules per kilogram of reactants.
Consider 1 mole of plutonium-239 to be a mole of “reactions” (molar mass = 239 grams).
2. Determine the mass of fuel required for the expected energy consumption in the United States for the next 10 years.
Energy use per person per year in the United States = 3.5 × 1011 joules.
Base your calculations on a current population of 310,000,000.
Answers
The formula for energy release per kilogram of fuel burned is energy release per kg=6.702*10-13. and 19. J 1 Mev = 1.602 X 10 T
Calculate the energy in joules per kilogram of reactants given MeV per reaction. Energy is the ability or capacity to perform tasks, such as the ability to move an item (of a certain mass) by exerting force. Energy can exist in many different forms, including electrical, mechanical, chemical, thermal, or nuclear, and it can change its form.
Think of a mole of plutonium-239 (molar mass: 239 grams) as a mole of "reactions."
Energy used in the US per person annually = 3-5 X 1011
Population (number of people) = 3.108The required mass of the fuel is 3.5x1011 x3-1x10 8x 10)/6.703 X1013 kg. the mass required: 1.62 x 1033 kg Mev in Joules 6 is equal to 101.60*I0-
19. J 1 Mev = 1.602 X 10 T, which translates to 1.602*1013/2.39x10-3 energy release per kilogram, or 6.702*10-13.
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1)A 2.0 kilogram wooden object is a on a wooden surface. What is the maximum force of friction that can be produced in this system?
Answers
Answer:
fr = 7.84 N
Explanation:
To solve this exercise we must use Newton's second law, the case of translational equilibrium
F -fr = 0
F = fr
where F is the applied force and fr the friction force
for the Y axis
N -W =
N = W
N = m g
the friction force has the equation
fr = μ N
fr = μ m g
in this case they indicate the two materials that are in contact with wood on wood, so when reviewing the tables the coefficient of static friction is μ=0.4
let's calculate
fr = 0.4 2.0 9.8
fr = 7.84 N
how to calculate the average value of the indirect measurements of KE
Answers
Answer:
1/2 m*(2(h)/t)*g
Explanation:
Kinetic energy refers to the form of energy that's used by an object due to its motion.
You didn't give more information about the values, therefore, the kinetic energy will be explained. It should be noted that when work, which helps in the transfer of energy is done on an object, the object will speed up and thereby gain kinetic energy.
Kinetic energy simply refers to the property of a moving object or a particle. It depends on both motion and mass. The formula for the calculation of kinetic energy is given as:= 1/2mv²
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what does the t wave of the electrocardiogram (ecg) represent?
Answers
The T wave of an electrocardiogram (ECG) represents the ventricular repolarization phase of the cardiac cycle. It represents the electrical recovery and relaxation of the ventricles after they have contracted during the QRS complex.
During the QRS complex, the ventricles depolarize, leading to their contraction and the ejection of blood. Following this contraction, the ventricles need to repolarize and relax in preparation for the next cardiac cycle. This repolarization is reflected by the T wave on the ECG.
The T wave typically has a positive deflection on the ECG, indicating the repolarization of the ventricles. The shape, duration, and amplitude of the T wave can provide valuable information about the heart's electrical activity and any potential abnormalities.
Changes in the T wave morphology or duration can be indicative of various cardiac conditions, such as electrolyte imbalances, ischemia, myocardial infarction, or drug effects. Hence, careful analysis of the T wave is essential in the diagnosis and monitoring of cardiac health.
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What is another name for non-traditional sports?
A. Random
B. Foreign
C. Alternative
Ο Ο
D. Team
SUBMIT
Answers
Answer: C Alternative
Explanation:
Hope this helps
Another name for non-traditional sports is Alternative. Alternative sports often involve unconventional or niche activities that may appeal to specific groups or subcultures. The correct option is option (c).
Another name for non-traditional sports is "alternative sports." These are sports or physical activities that may not be as mainstream or commonly recognized as traditional sports like football, basketball, or tennis.
Alternative sports often involve unconventional or niche activities that may appeal to specific groups or subcultures.
They provide alternatives to more traditional sports and can include activities like parkour, skateboarding, rock climbing, ultimate frisbee, and many others. Therefore, The correct option is option (c).
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Tracy stands on a skateboard and tosses her backpack to her friend who is standing in front of her. Which best describes the acceleration Tracy experiences?
It is less than the acceleration of the backpack because she has a greater mass.
It is greater than the acceleration of the backpack because she has a greater mass.
It is less than the acceleration of the backpack because she uses a smaller force.
It is greater than the acceleration of the backpack because she uses a larger force.
Answers
Answer:
It is less than the acceleration of the backpack because she has a greater mass.
Explanation:
edge 2021
Tracy stands on a skateboard and tosses her backpack to her friend who is standing in front of her then the acceleration Tracy experiences less than the acceleration of the backpack because she has a greater mass. Therefore the correct option is A.
What is Newton's second law?Newton's Second Law states that The resultant force acting on an object is proportional to the rate of change of momentum.
The mathematical expression for Newton's second law is as follows
F = m*a
where F represents the force applied
m is the mass of the object
a is the acceleration of the object
As we know that force depends both on the mass and the acceleration of the object if the force applied to the body is the same the body having higher mass experience less amount of acceleration.
When Tracy stands on a skateboard and tosses her backpack to her friend who is standing in front of her then the acceleration Tracy experiences less than the acceleration of the backpack because she has a greater mass. Therefore the correct option is A.
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A meteorite with a momentum of 2500kgm/s breaks into two pieces. One continues forward with a momentum of 1500kgm/s. What is the velocity of the other piece if it has a mass of 3.5kg?
Answers
An object's momentum is calculated by multiplying its mass by its speed. As a result, the momentum of two objects with the same velocity but different masses will not be the same. so the correct answer is
V = 285.7 m/s
Due to the fact that p = mv in this situation, the item with three times the mass of the other has three times the momentum.
Let. Pi = momentum of meteorite
Pi = 2500 kg.m/s
P2= momentum of one piece
= 1500 kg .m/s
P3 =momentum of second piece
P3= mv
m = mass of second piece = 3.5 kg
V = velocity of other piece = ?
Here, momentum is conserved
Pi =\(P_{3} + P_{2}\)
Pi = mv + P₂
mv = Pi - P₂
V = Pi - P₂/m
= 2500-1500/ 3.5.
V = 285.7 m/s
This is the velocity of other piece.
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Help with this review pls!!
Answers
Answer:
The 2 forces are a Push and a Pull
Mass is the resistance of change in speed or position when adding force.
Weight is the force of gravity
Tension Force is the pulling force transmitted through a string cable or chain. The formula for this is T = mg + ma.
It gives the particle the same acceleration as all those actual forces together as described by the Newton's second law of motion.
An unbalanced force is when there is 2 forces on opposites of an object both are adding force but one side is stronger than the other.
Friction is a force that heats things up. This happens when we rub our hands together and the heat that is generated from the friction makes our hands warmer.
Static friction is what keeps the box from moving without being pushed, and it must be overcome with a sufficient opposing force before the box will move. Kinetic friction (also referred to as dynamic friction) is the force that resists the relative movement of the surfaces once they're in motion.
A 2.0 kg 2.0kg2, point, 0, start text, k, g, end text cart moving right at 5.0 m s 5.0 s m 5, point, 0, start fraction, start text, m, end text, divided by, start text, s, end text, end fraction on a frictionless track collides with a 3.0 kg 3.0kg3, point, 0, start text, k, g, end text cart initially at rest. The 2.0 kg 2.0kg2, point, 0, start text, k, g, end text cart has a final speed of 1.0 m s 1.0 s m 1, point, 0, start fraction, start text, m, end text, divided by, start text, s, end text, end fraction to the left. What is the final speed of the 3.0 kg 3.0kg3, point, 0, start text, k, g, end text cart?
Answers
The final speed of the 3.0 kg cart is 4 m/s.
What is conservation of momentum principle?When two bodies of different masses move together each other and have head on collision, they travel to same or different direction after collision.
The external force is not acting here, so the initial momentum is equal to the final momentum. For elastic collision, final velocities is different for both the bodies.
m₁u₁ +m₂u₂ = m₁v₁ +m₂v₂
A 2.0 kg cart moving right at 5.0 m/s on a frictionless track collides with a 3.0 kg cart initially at rest. The 2.0 kg cart has a final speed of 1.0 m/s to the left.
Substitute the values for m₁ = 2kg, m₂ =3kg, u₁ =5 m/s and u₂ =0 m/s, then the final velocity will be
3x0 +2x5 = -2x1 + 3v₂
v₂ = 4 m/s
Thus, the the final velocity 3.0 kg cart is 4 m/s.
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A transformer has 1000 turns on the primary coil.
The voltage applied to the primary coil is 230V a.c,
How many turns are on the secondary coil if the output
voltage is 46 V a.c.?
A)20 B)200 C)2000 D4000 E)8000
Answers
Answer:
200
Explanation:
Given parameters:
Number of turns in primary coil = 1000 turns
Primary voltage = 230V
Secondary voltage = 46V
Unknown:
Number of turns in secondary coil = ?
Solution:
To solve this problem, we have to use the expression for solving problems related with transformers;
\(\frac{Vs}{Ns}\) = \(\frac{Vp}{Np}\)
Vs is the secondary voltage
Ns is the number of secondary turns
Vp is the primary voltage
Np is the number of primary turns
Now insert the parameters and solve;
\(\frac{46}{Ns}\) = \(\frac{230}{1000}\)
46 x 1000 = 230Ns
Ns = 200
assume the excitation sources in problem 18-3 have the same power. (a) compare the relative intensities of the raman lines of the antihistamine for each of the two excitation sources. (b) if the intensities were recorded with a typical monochromator-photomultiplier system, why would the measured intensity ratios differ from the ratio calculated in part (a)?
Answers
The ratio estimated in section (a) does not match the intensities obtained with a standard monochromatic-photomultiplier system since the detector efficiency, which depends on wavelength, should be at its maximum.
In basic terms, what is wavelength?The length of a waveform message that is propagating in space or over a wire is measured by the separation between identification based (adjacent emblems) in the neighboring cycles. Its length is generally defined in meters (m), millimeters (cm), or millimeters (mm) in wireless systems (mm).
What does light have a wavelength?The region of the em spectrum that can be seen by the human eye is known as the visible light spectrum. Visible light is the more straightforward term for this set of wavelengths. Usually, wavelengths between 380 to 700 micrometres can be seen by the human eye.
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the pressure of moving air is callled
Answers
Answer:
This moving air is called wind. Winds are created when there are differences in air pressure from one area to another.
Explanation: