An electric clothes dryer rated at 3,000 W uses 60,000 J of energy in 20 minutes.
To calculate the energy used by an electric clothes dryer, we can use the formula: Energy (in joules) = Power (in watts) × Time (in seconds). Given that the dryer is rated at 3,000 W and you need to find the energy used in 20 minutes, we first need to convert the time to seconds.
There are 60 seconds in a minute, so 20 minutes is equivalent to 20 × 60 = 1,200 seconds. Now, we can use the formula to find the energy:
Energy = 3,000 W × 1,200 s = 3,600,000 J
However, it is more common to express energy consumption in kilojoules (kJ) or kilowatt-hours (kWh) for household appliances. To convert the energy to kilojoules, divide the energy in joules by 1,000:
Energy = 3,600,000 J ÷ 1,000 = 3,600 kJ
To convert the energy to kilowatt-hours, divide the energy in joules by 3,600,000:
Energy = 3,600,000 J ÷ 3,600,000 = 1 kWh
So, the electric clothes dryer uses 60,000 J (3,600 kJ or 1 kWh) of energy in 20 minutes.
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Select the correct equations that show that 25 WW of power is required to give a brick 100 JJ of PEPE in a time of 4 ss .
25w = 100J/4s is the equation which rightly deciphers the relation of power, work and time.
What does "power" mean in physics?Power is the rate at which work is performed or energy is delivered in accordance with science and engineering. It can be represented as W/t, which refers to the product of the quantity of work finished (W) or energy converted (E) divided by the amount of time (t).
power (w) equals work (J)/time (s)
What does "work" mean with respect to science?The energy that is generated when a force is imposed on a moving object is described as work. The work that a force would do on an item is directly proportional to the force multiplied by the displacement multiplied by the cosine of the angle between them. The SI unit of work and energy is denoted by the letter J.
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Show that 25 W of power is required to give a brick 100 J of PE in a time of 4 s .
A common source of wave motion is a:
Answer: A vibrating object is the common source of wave.
Explanation:
The cause of all wave motion is a vibrating object. The motion of waves is caused by the vibrations of the substance they are made of, and these vibrations lead them to move in an oscillatory fashion.
For instance, when the air surrounding us vibrates, sound waves are created. On the other hand, charged particles that are oscillating, like they are in the antenna, produce electromagnetic waves.
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PLEASE HELP
Fill in the blanks to correctly complete the statement.
The motion of an object moving with uniform circular motion is always_______
to the circle, so the speed of an object moving in a circle is known as _______
speed.
Answer:
The first one is tangent, second is tangential.
What happens if there is no transformation of energy in the world ?
Answer:
If there were no transformation of energy in the world, everything would come to a standstill.
Explanation:
Energy is required for all processes and interactions to occur, including movement and chemical reactions. Without energy, matter would not be able to move or change in any way. This would mean that living organisms would not be able to survive, as they rely on energy to carry out metabolic processes and maintain their body's functions.
The sun would not shine, the wind would not blow and the water would not flow, as they are all driven by energy transformations. The weather would not change, and there would be no seasons. The temperature would not vary and the weather patterns would not change.
Machines and technology would not work, as they also rely on energy to operate. There would be no electricity, transportation, or communication. The economy would come to a standstill as all the industry, trade, and commerce would stop.
In short, without energy transformation, the world would be a static, lifeless place, and life as we know it would not be possible.
Two freight cars, each with a mass of 2.3 ✕ 105 kg, collide and stick together. One was initially moving at 3.2 m/s and the other was at rest. What is their final speed?
It is also commonly abbreviated as ms−2. For example, if the velocity of a particle moving in a straight line changes uniformly (at a constant rate of change) from 2 m/s to 5 m/s over one second, then its constant acceleration is 3 m/s2.
How to find a final speed?A change in velocity that does not alter over time is referred to as a constant acceleration. A car's average acceleration stays constant at 20 mph per minute even if it increases its speed by 20 mph in one minute and another 20 mph the next. In other words, if an object is falling freely on Earth, gravity will cause it to accelerate (or move faster) by 9.81 metres every second. Gravity actually is constant throughout space. If an object travels the same distance at the same rate and does not change its direction, its velocity is constant. The item experiences acceleration whenever there is a change in velocity. Therefore, whenever the velocity's size or direction.To learn more about final speed refer to:
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What will irregular galaxies eventually form into before transitioning into something else
billions of years later?
1.total galaxies
2.meteorite galaxies
3.dwarf galaxies
4.spiral galaxies
After a period, they start to collide with other galaxies, which causes them to become irregular galaxies. They eventually transform into ancient elliptical galaxies after exhausting all of their dust and gas to form new stars.
Do atypical galaxies produce stars?It is possible to think of irregular galaxies as star formation research labs. In contrast to the more well-known spiral galaxies, this kind of galaxy produces stars from an interstellar medium that has undergone less chemical evolution.
What occurs to erratic galaxies?Typically, irregular galaxies are tiny, with a mass of only a tenth that of the Milky Way galaxy. They are vulnerable to environmental influences like colliding with massive galaxies and cosmic clouds because of their modest sizes.
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Elements are arranged in the periodic table based on various patterns. For example, the element magnesium (mg).
Elements are arranged in the periodic table based on various patterns. For example, the element magnesium (Mg) A. has a higher atomic mass than the element sodium (Na). Option C is correct.
Describe the periodic table.The known elements are arranged in the periodic table in increasing atomic number order and repeating chemical properties.
They are arranged in a tabular fashion, with each row denoting a certain era and each column denoting a particular group.
The elements are arranged in ascending atomic number sequence from top to bottom and left to right.
Elements belonging to the same group will have similar chemical properties because they will have the same valence electron configuration.
The periodic table's arrangement of elements follows a number of different patterns. For instance, sodium (Na) and magnesium (Mg) both have higher atomic masses (Na).
As a result, choice C is accurate.
Your question is incomplete but most probably your full question was Elements are arranged in the periodic table based on various patterns. For example, the element magnesium (Mg) has
a. a higher atomic mass than the element calcium (Ca).
b. has a lower atomic mass than the element beryllium (Be).
c. has a higher atomic mass than the element sodium (Na).
d. all of these
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'3. It takes a student 5 seconds to pull a 20 kg stack of books, initially at rest, 10
meters across a frictionless lab floor.
a. What was the final velocity of the books?
B.What was the rate of acceleration of the books?
C.What was the net force on the books
The books' final speed is 4 m/s, their rate of acceleration is 0.8 m/s2, and their net force is 3.2 m/s2.
What is called velocity?The vectorial expression of velocity is the movement in space-time of an object or particle. The recognised unit of velocity magnitude is the metre per second (m/s) (also known as speed). The rate of speed can also be expressed in centimetres per second (cm/s). The pace at which an object's location changes as seen from a certain angle and as stated by a specific time unit (for example, 60 km/h northbound) is measured by its velocity, which is the direction in which it is travelling.
What is velocity in physics?As a physical vector quantity, velocity must have a specified magnitude and direction. Speed is a coherent derived unit whose quantity is measured in metres per second (m/s or ms1) in the SI. Speed is the scalar absolute value (magnitude) of velocity (metric system). A vector is "5 metres per second east."
= ∆/∆
v=20/5 v=4
Therefore the final velocity of the book is 4m/s.
Acceleration= v/t
=4/5
=0.8m/s2
Thus acceleration of book is 0.8m/s2
F=0.8*4
F=3.2m/s2
Net force is 3.2m/s2
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What is one reason scientists have developed a system to classify organisms
Better identification of novel species is made possible by categorization.
Why would scientists create a system of classification for organisms?Living things are categorised by scientists in order to organise and make sense of the astounding diversity of life. We can better comprehend how different living entities are connected to one another by classifying them.To better comprehend the evolutionary relationships among various creatures, scientists classify organisms according to taxonomy. We may learn the fundamentals about a group of creatures and use that information to our advantage when researching the organism later on by classifying animals that are similar in evolutionary terms.Better identification of novel species is made possible by categorization.To learn more about organisms refer to:
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For a liquid drop of radius r falling in air with terminal velocity, power delivered by gravitational force is proportional to.
P = m g v is the essential formula for power. Power therefore follows velocity (v).
Power, what is it?The amount of effort finished in a specific length of time is a definition of power. The SI power measurement is the wattage (W), that is derived from watts per square meter per second (J/s). Horsepower (hp) is a measuring unit sometimes used to express the power of automobiles and other equipment. It is roughly comparable to 745.7 watts.
The link among work and time is what is known as power.
P = W / t
In the case of a drop descending, the applied load and the displacement have the same direction, hence the angle in between them is negative and the cosine of zero is only one (cos 0 = 1). The work is defined as the product rule of the force and also the displacement.
W = F y
The relationship between the gravitational force and the drop's mass is F = mg.
W = mg y
we substitute
P = m g y / t
terminal velocity of the drop is constant
P = m g v
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2. If a person pulls on a cart to the right with a force of 7 N and another person pulls to the left with a force of 13
N, what is the net force? Is it balanced or unbalanced? Label picture with direction arrows and numbers.
13N
a. net force =
b. Is it balanced or unbalanced?
C. How could the two people make their forces balanced?
7N
Answer:
1. Net force= 6 N to left
2. Unbalanced
3. Both people must apply same magnitude of forces in opposite direction which causes net force to be 0.
Explanation:
Since both forces have opposite direction then we have to subtract the magnitude and consider the direction of vector that has greatest magnitude. In this case, the left side (13N) has more magnitude than the right side (7N). Hence:
[tex] \displaystyle{ \sum \vec F = 13 \: \text{N}- 7\: \text{N}= 6 \: \text{N to left}}[/tex]
The vector arrow of net force will point to left side with magnitude of 6 N.
Since the net force is not zero. This means that the force is not balanced as an object still changes its motion from resting to moving. A balanced force would mean the net force is zero and an object will always remain as same condition. This can be referred to first Newton's law of motion.
We can make the force balanced by having both people acting same magnitude of force in opposite direction. The equation must result in:
[tex] \displaystyle{ \left | \vec F \right | = \left| - \vec F \right| }[/tex]
Magnitude of forces must equal for both sides and also have to act in opposite direction which causes net force to be zero:
[tex] \displaystyle{ \sum \vec F = 0}[/tex]
A 2 kg ball is thrown down off a roof 10 meters high. At the bottom when it hits the ground
it is traveling 15 m/s. What is it's kinetic energy as it hits the ground?
The kinetic energy as it hits the ground with mass of 2kg and velocity 15m/s is found to be 225J
Explain what is kinetic energy?The energy a body has as a consequence of motion is known as kinetic energy. A force has to be applied to an object in order to propel it. We must put in effort in order to apply a force. After the work has been finished, energy is transferred to the item, which then travels at a new, constant speed.
At the bottom when ball hit ground with velocity = 15m/s
KE = 1/2 m v^2 => 1/2 x 2 x 15^2 => 225J
What distinguishes kinetic energy from potential energy?Potential energy is the energy that is kept in reserve in a system or object as a result of its orientation or configuration. An object's kinetic energy is measured in relation to stationary and moving items in its immediate surroundings. Potential energy is irrespective of an object's surroundings.
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Scalar and Vector Quantities are both measurements
-True
-False
Answer:
Explanation:
Scalar is the measurement of a unit strictly in magnitude. Vector is a measurement that refers to both the magnitude of the unit and the direction of the movement the unit has taken. In other words, scalar quantity has magnitude, such as size or length, but no particular direction. When it does have a particular direction, it's a vector quantity.
Physical science help pls I struggling
The cost of using 50 W for one day or 24 hours is dollar 0.12. The cost of using 800 W for 1 hour is 0.08 dollar.
What is power?Power is the rate of work done energy of an object. Given that the cost of using 1 KWhr energy is dollar 0.10.
Then cost of using 50 W or 0.05 KW in 24 hours is
0.05 × 24 × 0.10 = 0.12 dollar
Cost of using 800 W or 0.08 KW per hour is 0.08 KWhr × 0.10 = dollar 0.08
Similarly, the cost of using 150 W in one month is find as follows:
150 W = 0.15 KW
energy used = 0.15 × 30 × 24 hrs
cost = 0.15 × 30 × 24 hrs × 0.10 = dollar 10.8
The energy causing a cost of 2.5 dollar is 2.5/0.10 = 25 KWhr
power = 25 KWHr/24 hrs = 1.04 KW.
The energy causing a cost of 4 dollars is 4/0.10 = 40 KWhr
power =40 KWHr/24 hrs = 1.6 KW.
The energy causing the cost of 3 dollars = 3/0.10 = 30 KWhr
then time = 30/100 W = 0.3 hr.
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A bird species gains a new trait from a neutral mutation. After many generations, the trait becomes beneficial. What could have caused the change in the mutations effect?
Mutations may alter the structure of a protein, may be neutral, may be dangerous, or may be advantageous.
A mutation is a change to an organism's DNA sequence. Viral infection, mistakes in DNA replication during cell division, and exposure to mutagens can all lead to mutations. Gametes experience germline mutations. Other bodily cells are susceptible to somatic mutations. Chromosome alterations are mutations that change the structure of a chromosome. A single nucleotide is altered by point mutations. Depending on the situation or place, the impacts of mutation could be beneficial, negative, or neutral. The majority of non-neutral mutations are harmful. The impact and likelihood that a mutation will occur increase with each extra base pair that it modifies.
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what's the difference between nebula,protostar,and a star?
Answer:
Explanation
one is a galaxy and one is a Star.
Consider a 0.95 MeV y-ray photon. Randomized Variables E = 0.95 MeV
Considering a 0.95 MeV y-ray photon and Randomized Variables E = 0.95 MeV so the frequency of light will be 2.294×10²⁰ Hz.
Given,
The energy of photon
E = 0.95 MeV = 0.95× 1.6×10⁻¹³ J or 1.52 × 10⁻¹³ J
Using E = hυ
We have:
υ = E/h = 1.52×10⁻¹³/(6.626×10⁻³⁴)
= 2.294×10²⁰ Hz
Thus the frequency of light will be 2.294×10²⁰ Hz.
Associated to each wave vector ~k and polarization state σ there is an electromagnetic normal mode of oscillation with frequency ω(k) = kc and complex amplitude aσ( ~k). In the absence of sources, the behavior of the electromagnetic field is completely described by these normal modes. We will assume the normal modes are defined using periodic boundary conditions.
For each ~k and σ there is a Hilbert space of square integrable functions and a Hamiltonian( ~k). For each ~k and σ there is a basis of energy eigenvectors; the corresponding ladder operators act on this basis by adding and subtracting quanta of energy ω(k).
We can use this basis to induce a basis for the tensor product over all the oscillator Hilbert spaces, which is the state space for the composite system of normal modes, i.e., the electromagnetic field.
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Please Help! Show all work, please! Thank you!
70!! points!
The Kinetic energy will be 19663 J that is approximately 2.0 × 10³ J option B.
What precisely is kinetic energy?An object or particle has kinetic energy because of its motion. When an item undergoes work—the transfer of energy—by being subjected to a net force, it accelerates and acquires kinetic energy. It's SI unit is Joules.
Given, mass of the car, m = 1400 kg
velocity of the car= 5.3 m/s
by applying the formula ,Kinetic Energy = 1/2×mass×velocity²
K.E. = 1/2×1400×(5.3)²
K.E = 700×28.09
K.E. = 19663 J ≈ 2.0 × 10³ J
The Kinetic energy will be 19663 J that is approximately 2.0 × 10³ J.
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a ball player catches a ball 3.40 ss after throwing it vertically upward. part a with what speed did he throw it?
The speed of the ball that the ball player throw is 16.66 m/s.
The ball player throws a ball vertically upward and then catches the ball. It means, the ball doing vertical motion travel upward to the highest point and then goes down until the ball player catches it. The trajectory of the ball as it goes up is symmetrical to the trajectory of the ball as it goes down.
The time to travel upward is equal to the time to travel downwardtravel time = travel time upward + travel time downward
t = t₁ + t₂
3.40 = t₁ + t₁
3.40 = 2t₁
t₁ = 3.40 ÷ 2
t₁ = 1.70 s
When the ball travels upward, non-uniform motion applies
v₂ = v₁ + at
a = the accelerationv₂ = v₁ + at₁
0 = v₁ + (- 9.8 × 1.70)
0 = v₁ - 16.66
v₁ = 16.66 m/s
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A tsunami wave has a wavelength of 160,000 m and a frequency of .0014 HZ
A wind driven wave has a wavelength of 150 and a frequency of 0.083 HZ
What would be the velocity of each wave? Show your calculation
Velocity is a physical vector quantity that is defined by magnitude and direction. A coherent derived unit called speed is used to indicate the magnitude or absolute value (scalar) of velocity. In the SI, its value is represented in meters per second (m/s or m/s1) (metric system).
What is velocity?When an object is traveling, its velocity is the direction it is travelling in to indicate how quickly the object's location is changing as seen from a particular point of view and as measured by a certain unit of time, such as 60 km/h in a northerly direction. The idea of velocity serves as a key building component in kinematics, the branch of classical mechanics that analyzes how bodies move.
The velocity of a wave can be calculated using the wavelength (λ) and frequency (f) of the wave using the formula:
Velocity = wavelength x frequency
For the tsunami wave:
Velocity = 160,000 m x .0014 Hz = 224 m/s
For the wind-driven wave:
Velocity = 150 m x 0.083 Hz = 12.45 m/s
So the velocity of the tsunami wave is 224 m/s and the velocity of the wind-driven wave is 12.45 m/s.
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Which of the following best describes mineral habit?
General physical appearance best describes the mineral habit.
External physical appearance, which a mineral tends to have is known as its habit. It may be long slender ones, blocky crystals, or aggregates of some type, etc.
Blocky crystal is a box-like or ball-like appearance. Tabular crystal is just like a deck of playing cards(thick). Prismatic shape is like end faces are parallel to each other. They may be long, and short based on the ratio of length to lateral width ratio.
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a 200-kg vehicle travelling 30 m/s takes 10 s to stop. what force did the vehicle experience? show your work
Answer:
F = 600 N
Explanation:
m = 200 kg
u = 0 m/s 3
v = 30 m/s
t = 10 s
a = v-u /t
= 30 - 0 / 10
= 30 / 10
= 3 m/s²
F = m a
= 200 × 3
= 600 N
A single raindrop illuminated by sunshine disperses:
A single raindrop illuminated by sunshine disperses the white light into seven colors spectrum.
A white sunlight consists of seven different color components. These color components have different wavelength. The speed of different components is different when they passes through an optically denser medium(e.g.: prism). So each color component gets bent by a certain amount thus causing dispersion.
A raindrop acts like a prism for the sunshine. When a light ray passes through a rain drop, it splits into seven color component which is known as the dispersion of light.
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A workman carries some lumber up a staircase. The workman moves 9. 6 m vertically and 22 m horizontally. If the lumber weighs 45 n, how much work was done by the workman?.
The required work was done by the workman is 432 J.
Define work done by object?Work is the energy exerted by an object as it applies a force to move another object over some distance. For a given amount of force, F, and a given distance, d, the work done on an object is given by the formula W=F⋅d .
We have,
Weight = Force due to gravity = -45j N
Total displacement = 22i + 9.6j Meter
Now,
Work done by gravity = -F.d = Work done by man
W = -45j(22i + 9.6j ) J
W = -45( 9.6) = -432 J
Thus, work done by man is 432 J
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If an object weighs 140N on the Moon, what will it weigh here on Earth?
On the moon you weigh 6 times lighter so for this problem you multiply 140n by 6.
What is weight on Moon?Your weight on the Moon is 16.5% what you would experience on Earth. In other words, if you weighed 100 kg on Earth, you would weigh a mere 16.5 kg on the Moon. For you imperial folks, imagine you tipped the scales at 200 pounds.
It’s because of the lower gravity on the Moon. Objects on the surface of the Moon experience only 16.5% of the gravity they would experience on Earth.
The mass of the Moon is only 1.2% the mass of the Earth, so you might expect it to have only 1.2% of the gravity. But it’s only 27% of the size of the Earth, so when you’re standing on the surface of the Moon, you’re much closer to its center of gravity.
Therefore, On the moon you weigh 6 times lighter so for this problem you multiply 140n by 6.
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Speed and velocity
Number 1-5
Average speed = total distance covered/ total time taken
here on the graph y-axis is represented as distance and x-axis is showing time
So for the average speed of Train (line A)
total distance covered (d) = 1500 m
total time taken to reach that distance (t) = 150 s
so by a simple formula
d/t1500/15010 m/sFor the average speed of Car (line B)
Total distance covered (d) = 1500 m
total time taken to reach that distance (t) = 120 s
so by
d/t1500/12012.5 m/sFor Maximum speed of roller- coaster (LineC)
So in the time between 70-80 seconds, it has the highest slop which shows the speed maximum at that time
In that 10 seconds, it covered 200 meters which shows its maximum speed which is
d/t200/1020 m/sFor the average speed of a Roller- coaster (line C)
Total distance covered (d) = 1300 m
total time taken to reach that distance (t) = 150 s
Speed = d/t1300/1508.667 m/sFor the Train to Stoped at a station we can see from 40 seconds to 90 Seconds train has covered almost 0 distance which clearly shows that it was stopped which is 90-40= 50 seconds.
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In which digestive organ does the majority of lipid digestion and absorption occur?
The digestive organ that the majority of lipid digestion and absorption occur is the small intestine.
What is the small intestine?The small intestine is a part of the digestive system that is made up of the duodenum, jejunum, and ileum. It is the part of the digestive system that will follow the stomach.
This part of the intestine will be in charge mainly of the digestion of lipids, this process will begin in the mouth and in the stomach but then the digestion will take place in the small intestine with the help of lipase enzymes which will break the lipid molecules. After this process happens, the absorption of the lipids that will travel through circulation and go throughout the body will take place.
Therefore, we can confirm that the digestive organ that the majority of lipid digestion and absorption occur is the small intestine.
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When do a 1000kg car and a 2000kg truck have the same momentum
Answer:A 1000 kg car and a 2000 kg truck have the same momentum when the car is travelling at twice the speed of the truck, i.e. 38 m/s.
When a 1000kg car and a 2000kg truck have the same momentum, the speed of 1000 kg car is twice that of the 2000kg truck.
What is momentum?The product of a particle's mass and velocity is its momentum. Being a vector quantity, momentum possesses both magnitude and direction. According to Isaac Newton's second equation of motion, the force applied on a particle is equal to the time rate of change of momentum.
As a 1000kg car and a 2000kg truck have the same momentum,
1000 kg × v₁ = 2000 kg × v₂
v₁ = 2v₂
Hence, the speed of 1000 kg car is twice that of the 2000kg truck.
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Jet streams are associated with fronts because of the:
Due to the significant temperature gradient, jet streams are connected to fronts.
The upper-level winds' wave-like or meandering behavior in the middle latitudes is crucial for moving heat between the equator and poles.The cold front itself frequently brings a thin band of precipitation that travels along its leading edge. Strong bands of precipitation such as these have the potential to produce tornadoes, severe thunderstorms, hailstorms, snow squalls, and other severe weather. The correct response is "moisture and variations in air pressure." An air mass boundary, such as that between warm and cold air, is represented by a front. A cold front exists when cold air is moving toward warm air. However, if a warm air mass is advancing and a cold air mass is retreating.To know more about jet streams here
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A peanut burned in a calorimeter transfers 18,200 joules to 100.0 g of water. What is the rise in the water's temperature
The rise in the water's temperature, given that 18200 joules was transferred to the 100.0 g of water is 43.5 °C
How do I determine the temperature rise of the water?Heat transferred I related to temperature rise by the following formula:
Q = MCΔT
Where
Q is the heat transferred M is the mass C is the specific heat capacity ΔT is the temperature riseWith the above formula, we can determine the temperature rise as illustrated below.
The following data were obtained from the question:
Heat transferred (Q) = 18200 JoulesMass of water (M) = 100.0 gSpecific heat capacity of water (C) = 4.184 J/gºC Temperature rise (ΔT) =?Q = MCΔT
18200 = 100 × 4.184 × ΔT
18200 = 418.4 × ΔT
Divide both sides by 418.4
ΔT = 18200 / 418.4
ΔT = 43.5 °C
Thus, we can conclude from the above calculation that the temperature rise of the water is 43.5 °C
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