The 120 V electric heater in a coffee maker has a resistance of 14 Ω.
How long will it take for this heater to raise 7 cups (1540 g) of water from 20∘C to the ideal brewing temperature of 90∘C?
Answers
The 120 V electric heater in a coffee maker has a resistance of 14 Ω.
and it takes 471.14 sec to raise the temperature of 7 cups of water from 20°C to 90°C.
The heat energy is given by:
Q = mcΔT
Q represents heat energy, m mass of the water, c is the specific heat capacity, and ΔT is the change in temperature,
The heat energy required to raise the temperature of 7 cups
(m = 7 cups × 236.6 g/cup = 1656.2 g)
The specific heat capacity of water is 4.18 J/g°C (standard value)
Change in temperture ΔT = 70°C
Q = 1656.2 × 4.18 × 70
Q = 484604.12 J.
Electrical energy is given by:
E = P × t
Where, P is the power, and t is the time,
P = V² / R, (by Ohm's law)
Where V is the voltage and R is the resistance,
P = (120)² / 14
P = 1028.57 W
The time (t) is given by the equation;
E = Pt (Here E is the electrical energy, p is the power and t is the time)
t = E / P
t = 484604.12 / 1028.57
t = 471.14sec
The required time is 471.14 sec.
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Related Questions
What would be the mass of an object that has a force of 88N and an acceleration of 12 m/s2?
Answers
Answer:
7.33 kg
Explanation:
F = ma
88 N = m(12 m/s^2)
m = 7.33 kg
In a laboratory experiment, a muon is observed to travel800 m before disintegrating. A graduate student looks up the lifetime of a muon (2 x w-6 s) and concludes that its speed was
Answers
If a muon is observed to travel 800 m before disintegrating and if its lifetime is (2 x 10-6 s), then the speed of the muon is 400,000,000 m/s.
What is the relation between speed, distance and time?
To find the speed of the muon, we need to use the formula:
distance = speed x time
We are given the distance traveled by the muon before disintegrating, which is 800 m. We also have the lifetime of the muon, which is 2 x 10^-6 s.
To find the speed, we need to rearrange the formula:
speed = distance / time
Substituting the values we have:
speed = 800 m / (2 x 10^-6 s)
simplifying:
speed = 400,000,000 m/s
Therefore, the speed of the muon is 400,000,000 m/s.
Note: This speed is close to the speed of light, which is 299,792,458 m/s. It is not uncommon for particles to travel at very high speeds in experiments such as this.
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A raindrop falls from a cloud 100 m above the ground. Neglect air resistance. What is
the speed of the raindrop when it hits the ground? Is this a reasonable number? Explain.
Answers
Answer:
Explanation:
Use the kinematic equation
\(V^2=V^2_i+2a(x_f-x_i)\)
The initial velocity was given from the word "falls." Acceleration due to gravity is 9.8 m/s^2.
\(V^2=0^2+200(9.8)\)
\(V=\sqrt{1960} =44.27m/s\)
A raindrop falls from a cloud 100 m above the ground. Neglect air resistance. The speed of the raindrop when it hits the ground would be 44.27 meters/ second.
What is mechanical energy?The sum of all the energy in motion (total kinetic energy) and all the energy that is stored in the system (total potential energy) is known as mechanical energy.
As given in the problem A raindrop falls from a cloud 100 m above the ground. Neglect air resistance, then we have to find out the speed of the raindrop when it hits the ground,
The speed of the raindrop = √(2gh)
=√(2*9.8*100)
=44.27 meters/seconds
Thus, if a raindrop falls from a cloud 100 m above the ground. Neglect air resistance. the speed of the raindrop when it hits the ground would be 44.27 meters/ second.
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Scientist Jordan makes a discovery and publishes the results for other scientists to read. Scientist Leesha tries to repeat the experiment and cannot make it work. Her results are also published. Scientist Jordan looks at his data again and finds that the discovery only works under certain conditions. He publishes the change. Now scientist Leesha repeats the new method and finds the same results as Jordan, but another scientist, Winslow, gets different results. What does this story demonstrate? A. that scientific knowledge is impossible to obtain B. that scientific knowledge results from a lot of debate and confirmation C. that scientific knowledge is developed by individual scientists in isolation D. that scientists are really good at arguing
Answers
Answer:
Answer choice B!
Explanation:
Study Island work
Answer:A
I DID THIS ON STUDYILSLAND
If mass increases - Force of gravity increases
A. True
B.False
Answers
The answer is True.
The structural diversity of carbon-based molecules is based upon which of the following properties?
A. the ability of those bonds to rotate freely
B. the ability of carbon to form four covalent bonds
C. None of these choices is correct.
D. All of these choices are correct.
E. the orientation of those bonds in the form of a tetrahedron
Answers
The ability of carbon to form four covalent bonds: Carbon has four valence electrons, allowing it to form up to four covalent bonds with other atoms.
This versatility in bonding allows for the formation of complex and diverse carbon-based molecules.E. The orientation of those bonds in the form of a tetrahedron: Carbon atoms bonded to four different groups tend to adopt a tetrahedral geometry. This arrangement contributes to the three-dimensional shape and structural diversity of carbon-based molecules.Therefore, all of these choices contribute to the structural diversity of carbon-based molecules.
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Billy jumps upward with a velocity of 4.2 m/s off a 6m high diving board. how long does it take for Billy to hit the water?l
Answers
Billy jumps upward with a velocity of 4.2 m/s off a 6m high diving board. . Billy will take 0.43 sec to hit the water
The branch of physics that defines motion with respect to space and time, ignoring the cause of that motion, is known as kinematics.
using equation of kinematics
v = u + g*t
sign convention
positive y direction (upward) = +
negative y direction ( downward ) = -
v = u - g*t
0 = 4.2 - ( 9.8 * t )
t = 4.2 / 9.8
t = 0.43 sec
Billy will take 0.43 sec to hit the water
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What is main source of solar energy? Write it's reaction. Why is tremendous amount of energy is released from sun?
Answers
The main source of solar energy is nuclear fusion.
The equation of the nuclear fusion reaction in the sun is :
H + H → D + β + + ν, where β + represents a positron and ν stands for a neutrino.
There is a tremendous amount of energy released from the sun because nuclear fusion reaction reactions produce a large amount of energy due to a mass defect.
What is nuclear fusion?The Sun and other stars undergo nuclear fusion, which is the merging of two atomic nuclei to create a single, larger nucleus.
Both reactions produce significant quantities of energy, but nuclear fusion produces significantly less radioactive waste and has a much higher energy yield.
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Describe the change to the stores of energy of the wood, pipe and water as the water is heated
Answers
Answer:
thermal energy or proportional energy
Explanation:
when the wood is moved the energy is changed thoughout the wood and it would be the same as the pipe and water
Which type of electromagnetic radiation is most likely to be non -ionizing radiation ? A. Radio B. Ultraviolet C. X -rays D. Gamma rays
Answers
Radio waves are most likely to be non-ionizing radiation.
Electromagnetic radiation can be classified into ionizing or non-ionizing radiation, depending on its ability to ionize atoms or molecules in its path. Ionizing radiation has enough energy to remove electrons from atoms or molecules, while non-ionizing radiation lacks sufficient energy to do so.
Radio waves have the lowest frequency and energy among the different types of electromagnetic radiation in the electromagnetic spectrum. They have a wavelength range of 1 millimeter to 100 kilometers, and their energy is typically below 10^-4 electron volts, which is not enough to ionize atoms or molecules. As a result, radio waves are classified as non-ionizing radiation.
On the other hand, ultraviolet, X-rays, and gamma rays have higher frequencies and energies than radio waves and are classified as ionizing radiation. Ultraviolet radiation has enough energy to ionize atoms or molecules in the air, causing sunburn and other skin damage. X-rays and gamma rays have enough energy to penetrate through materials, including human tissues, and can cause cellular damage or mutations if exposure occurs.
In summary, radio waves are non-ionizing radiation, while ultraviolet, X-rays, and gamma rays are ionizing radiation.
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3. Since Aspeon is not expected togrow, Emily believes that the following equations can be used in the valuation analysis: (1) S=[EBIT−kd(D)](1−ks)
(2) V=S+D
(3) P=(V−D0)/n0
(4) n1=n0−D/P
(5) VL=VU+TD
Answers
The equations mentioned by Emily in the valuation analysis for Aspeon are as follows:
1) Equation (1): This equation represents the value of equity (S) and calculates it based on the EBIT (earnings before interest and taxes), the tax shield provided by debt (D), and the required return on debt (kd) and equity (ks). It implies that the value of equity is equal to the adjusted EBIT after deducting the tax shield from debt.
2) Equation (2): This equation calculates the total enterprise value (V) by adding the value of equity (S) and debt (D). It represents the total worth of the company, considering both equity and debt.
3) Equation (3): This equation calculates the price per share (P) by dividing the total enterprise value (V) minus the initial debt (D0) by the number of shares (n0). It represents the price per share based on the valuation of the company.
4) Equation (4): This equation calculates the new number of shares (n1) by subtracting the dividend (D) from the initial number of shares (n0) divided by the price per share (P). It represents the adjusted number of shares after the payment of dividends.
5) Equation (5): This equation calculates the levered value (VL) by adding the unlevered value (VU) with the tax shield value (TD). It represents the value of the company after considering the tax advantages of debt.
These equations provide a framework for valuation analysis, considering factors such as earnings, taxes, debt, and equity. They help assess the value and financial implications of Aspeon's growth prospects.
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Give a real-world example of how energy is transformed from electrical energy to thermal energy. Describe how the heat can be transferred to other objects through conduction, convection, or radiation.
Answers
Answer:
A microwave
Explanation:
Car
Lightbulb is a really good one
Same with the sun. That one has Chemical as well
Answer:
A stove
Explanation:it transfers heat
A wheel rotating about a fixed axis has an angular position given by = 3. 0 − 2. 0t 3 , where is measured in radians and t in seconds. What is the angular acceleration of the wheel at t = 2. 0 s? a. −1. 0 rad/s2 b. −24 rad/s2 c. −2. 0 rad/s2 d. −4. 0 rad/s2 e. −3. 5 rad/s2
Answers
The angular acceleration of the wheel at t = 2.0 s is d^2θ/dt^2 = -24 rad/s^2 (option b). This is obtained by taking the second derivative of the angular position function with respect to time.
Given: θ = 3.0 - 2.0t^3
Taking the first derivative of θ with respect to time:
dθ/dt = -6.0t^2
Taking the second derivative of θ with respect to time:
d^2θ/dt^2 = -12.0t
Plugging in t = 2.0 s:
d^2θ/dt^2 = -12.0(2.0) = -24 rad/s^2
Therefore, the angular acceleration of the wheel at t = 2.0 s is -24 rad/s^2.
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5. Chad wants to investigate whether adding a solute to water affects its boiling point and freezing point. He set up an experiment and recorded the boiling and freezing point in degrees Celsius (°C), his results are in the data table.
EFFECT OF SOLUTE ON BOILING AND FREEZING POINTS
Test
A.Water
B.Water + 10 grams of salt
C.Water + 20 grams of salt
D.Water +30 grams of salt
E.Water + 40 grams of salt
Boiling Point (°C)
A.100.0
B.100.5
C.101.0
D.101.5
E.102.0
Freezing Point (°C)
A.0
B.-2
C.-4
D.-6
E.-8
Based on the data, which statement would be the best conclusion?
A. Adding salt to water decreases the boiling point.
B. Adding any solute to water increases the boiling point.
C. Adding salt to water increases the boiling point and decreases the freezing point.
D. Adding any solute to water increases the boiling point and decreases the freezing point.
Answers
Answer:
Explanation:
C. Adding salt to water increases the boiling point and decreases the freezing point.
because of interstellar dust, astronomers can see at most about 5 kpc into the disk of the galaxy at visual wavelengths. what percentage of the galactic disk does that include?
Answers
Astronomers can see about 2.78% of the galactic disk at visual wavelengths.
Assuming the Milky Way galaxy has a disk radius of about 30 kpc, we can calculate the percentage of the disk visible at visual wavelengths using the formula for the area of a circle:
Visible area = π × (visible radius)^2
Total area = π × (total radius)^2
Substituting the given values, we get:
Visible area = π × (5 kpc)^2 ≈ 78.5 kpc^2
Total area = π × (30 kpc)^2 ≈ 2,827 kpc^2
Dividing the visible area by the total area and multiplying by 100, we get:
Percentage visible = (Visible area / Total area) × 100%
Percentage visible = (78.5 / 2,827) × 100% ≈ 2.78%
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Which planet orbits the Sun in 365 days?
Answers
Answer:
Earth
Explanation:
on a distant planet the acceleration due to gravity is less than it is on earth. would you float more easily in water on this planet than on earth? explain
Answers
on the other planet, floating is no better or worse than it is on Earth. Since gravity is smaller on the other planet than it is on Earth, you would weigh less there because of this.
Archimedes principlea weight of water equal to your own weight must be displace by your body in order to float, according to the Archimedes principle.
On a specific planet, the acceleration caused by gravity is less than that of the on the planet with lower gravity than the arch, thus even if our body weight will be smaller, the weight of water displaced will also be lower. Our bodies sense an upward push in the water that is equivalent to the weight of the water that is displaced. Due to the decreased gravity, the water that has been displaced has a smaller weight, which means that the buoyant force will also be lower. Thus, it won't require us to sing. We shall appear to be the same. We'll swim along the same shore as V 2 on Earth.
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The bearing of grids of an AB alignment is 100º 22', while the magnetic declination is 8º30' E. What are the true azimuth, magnetic azimuth, and grid azimuth of this alignment?
Answers
The true azimuth of the AB alignment is 91º 52' (east of north), the magnetic azimuth is 100º 22' (east of north), and the grid azimuth is 108º 52' (east of north).
To find the true azimuth, magnetic azimuth, and grid azimuth of the AB alignment, we need to consider the magnetic declination. The magnetic declination indicates the angle between true north and magnetic north at a specific location. In this case, the magnetic declination is 8º 30' E, which means that the magnetic north is 8º 30' east of the true north.
To calculate the true azimuth, we subtract the magnetic declination from the grid azimuth. The grid azimuth is given as 100º 22', so subtracting the magnetic declination of 8º 30' E gives us a true azimuth of 91º 52' (east of north).
The magnetic azimuth remains the same as the grid azimuth, which is 100º 22' (east of north).
The grid azimuth is calculated by adding the magnetic declination to the true azimuth. Since the magnetic declination is east, we add it to the true azimuth. Adding 8º 30' E to the true azimuth of 91º 52' gives us a grid azimuth of 108º 52' (east of north).
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Please awnser as fast as you can, I will give 30 points.
Why is there wind on mars and how is there wind on mars?
Answers
Answer:
Because the atmosphere is so thin, high wind velocities are needed to move sand and dust.
Two drops of mercury each has a charge on 5.44 nC and a voltage of 235.15 V. If the two drops are merged into one drop, what is the voltage on this drop?
Answers
To find the voltage of the combined drops, we can just add the voltage of both drops together.
2(235.15) = 470.3 Volts
a point charge q of mass 8.50 g hangs from the horizontal ceiling by a light 25.0-cm thread. when a horizontal electric field of magnitude 1750 n/c is turned on, the charge hangs away from the vertical as shown in the figure. the magnitude of q is closest to
Answers
Answer:
27.5μC
Explanation:
Given:
m=8.5*10^-3
E=1750N/C
Fg=9.8m/s^2
θ to vertical = 30°
Find:
Q
Fg=mg=8.5*10^-3 * 9.8 = 0.0833N
Tcos(30)=mg -> T=(mg)/cos(30) = 0.096N
Fe(force of electric field on charge) = Tsin(30) = 0.096sin(30) = 0.048N
E=F/Q -> Q=Fe/E = 0.048/1750 = 27.5μC
(see attachment)
We have that the the magnitude of charge Q is mathematically given as
Q=27.5uC
Magnitude of chargeQuestion Parameters:
a point charge q of mass 8.50 g hangs from the horizontal ceiling by a light 25.0-cm thread.
when a horizontal electric field of magnitude 1750 n/c is turned on
Generally the equation for the Tension is mathematically given as
For Horizontal Direction
\(Tsin \tTsin \theta=Q\theta=QE\)
For Vertical Direction
\(Tcos\theta=mg\)
\(tan\theta=\frac{QE}{mg}\)
Hence
\(Sin \theta=\frac{r}{e}\\\\\theta=sin^{-1}(12.5/25)=30\\\\And\\\\tan \theta=\frac{QE}{mg}\\\\\)
\(Q=\frac{mg+tan\theta}{E}\\\\Q=\frac{8.5e-3*9.8*tan \theta 30}{1750}\)
Q=27.5uC
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Only for people who know the answer to this question fully can answer this others please leave this question.So, Variation is caused by what two factors...????
PLEASE ANSWER IF YOU KNOW 100% TO THE ANSWER OF THIS QUESTION ...Thanks
Answers
Answer:
Please elaborate which variation. There are different types of variation
A blackbody has a
surface area of 2.00 m^2.
Find the energy emitted
per minute from this
area if the temperature
is 398 K. Express the
answer in joules. The
Stefan-Boltzmann
constant is 5.67 × 10^-8 W/m^2•K^4
Answers
The energy emitted per minute by the blackbody at the given area is 170,724.8 J/min.
Energy emitted per minute
The energy emitted per minute at the given area is calculated as follows;
P = σAT⁴
P = (5.67 x 10⁻⁸) x (2) (398)⁴
P = 2845.41 W = 2845.41 J/s
Convert energy emitted per second to per minutes
P = 2845.41 J/s x (60 s / min) = 170,724.8 J/min
Thus, the energy emitted per minute by the blackbody at the given area is 170,724.8 J/min.
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Please don't steal points. Physics A - Momentum Portfolio: the Seat Belt Design
PLEASE HELP! I'M FAILING THE CLASS! (PDF ATTACHED)
Answers
The use of seatbelts is one of the most effective ways to increase safety in vehicles. When designing seat belts, there are a few key considerations that must be taken into account. First, the seat belt must be strong enough to withstand the forces that occur in the event of a crash.
This requires careful selection of materials and construction methods to ensure that the seat belt can support the weight of the occupants of the vehicle.
Second, the seat belt must be designed to distribute the forces of a crash across the body in a way that minimizes injury. This means that the seat belt should be positioned correctly and should fit snugly against the body.
Third, the seat belt should be easy to use so that people are more likely to wear it. This means that the seat belt should be simple to fasten and adjust, and should not be too uncomfortable to wear for extended periods of time.
Overall, the design of seat belts is a complex process that requires careful consideration of a number of factors. By taking these factors into account, designers can create seat belts that are both effective at protecting passengers and easy to use.
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What is 18 °C in °F?
Answers
Answer:
18 degrees Celsius is equivalent to 64.4 degrees Fahrenheit.
Explanation:
To convert Celsius to Fahrenheit by using the formula
: (°C x 1.8) + 32 = °F
18 °C = 64.4 °F . Fahrenheit is a temperature scale created by German physicist Daniel Gabriel Fahrenheit in 1724.
What is Fahrenheit?
On this scale, temperature is measured by the expansion of a liquid, specifically a mercury-in-glass thermometer. The scale is based on three fixed points: the freezing point of pure water is defined as 32°F and the boiling point of pure water is defined as 212°F. The third point, 96°F, was determined to be body temperature. On the Fahrenheit scale, the difference between the freezing point and the boiling point of water is 180°F. There are 180 intervals between the two fixed points, and each interval is one degree.
The degree Fahrenheit (°F) is the most commonly used unit of temperature in the United States. 18 x (9/5) + 32 = 64.4°F
Therefore, 18 °C = 64.4 °F
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helpppppppp
Science
ASAP
Answers
2(Anther) - B(holds pollen)
3(Pollen)- A(Male Gametes)
4(Stigma)- C(Receives the pollen)
what affects the strength of an electric field? FOR SCIENCE
Answers
Answer:
The electric field strength is dependent upon the quantity of charge on the source charge (Q) and the distance of separation (d) from the source charge.
ch 11. which process releases the greatest amount of heat?
a. the condensation of 10 g of gaseous water
b. the freezing of 10g of liquid water
c. the boiling of 10g of liquid water
d. the melting of 10g of ice
Answers
The greatest amount of heat is released by the process called condensation. Hence, option A is correct.
Condensation is the process in which the gaseous state is converted into liquid state. When the air molecules come in contact with the cooler surface, they form liquid and this process is called a condensation reaction.
In a gaseous state, the molecules are said to be free. When they come closer to form a bond with the nearby molecules to form a liquid, the kinetic energy of gaseous molecules decreases. When kinetic energy decreases, they give their energy as heat. The release of heat energy is called the exothermic process.
Condensation releases the most energy compared to others. Thus, option A is correct.
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I need help finding the average acceleration fo tyler and bree
Answers
verdadero o falso de La energía interna es la energía térmica asociada al objeto en virtud del movimiento de sus moléculas.
Necesito ayuda, porfa.
Answers
Answer:
Es la energía cinética interna total de un objeto debido al movimiento aleatorio de sus ... a es la energía que posee un objeto o cuerpo en virtud del movimiento de sus ... Si el movimiento de estas moléculas y átomos es más rápido, se dice que el ... Por lo tanto, la energía térmica asociada con la conducción resulta de la .
Explanation: