assume that a chunk of potassium weighing 7.55 g is dropped into 400.0 g of water at 25.0 °c. what is the final temperature of the water if all the heat released is used to warm the water?
Answers
A chunk of potassium weighing 7.55 g is dropped into 400.0 g of water at 25.0 °c. The final temperature of the water is 29.1 °C.
To solve this problem, we can use the equation
q = m × c × ΔT
Where q is the heat gained or lost by the substance, m is the mass of the substance, c is the specific heat capacity of the substance, and ΔT is the change in temperature.
First, let's calculate the heat released by the potassium. The heat released by the potassium is equal to the heat gained by the water, so we can write
q(K) = -q(H2O)
Where q(K) is the heat released by the potassium and q(H2O) is the heat gained by the water.
The heat released by the potassium can be calculated using the following equation
q(K) = m(K) × ΔHfus + m(K) × c(K) × ΔT
Where m(K) is the mass of potassium, ΔHfus is the heat of fusion of potassium (2.33 kJ/g), c(K) is the specific heat capacity of potassium (0.757 J/g·°C), and ΔT is the change in temperature of the potassium.
Substituting the values, we get
q(K) = (7.55 g) × (2.33 kJ/g) + (7.55 g) × (0.757 J/g·°C) × (25.0 °C - (-78.3 °C))
q(K) = 17.6 kJ
The heat gained by the water can be calculated using the following equation
q(H2O) = m(H2O) × c(H2O) × ΔT
Where m(H2O) is the mass of water, c(H2O) is the specific heat capacity of water (4.184 J/g·°C), and ΔT is the change in temperature of the water.
Substituting the values, we get
17.6 kJ = (400.0 g) × (4.184 J/g·°C) × (T - 25.0 °C)
Solving for T, we get
T = 29.1 °C
Therefore, the final temperature of the water is 29.1 °C.
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Related Questions
what is gravity ?short ans
Answers
Answer:
Gravity, or gravitation, is a natural phenomenon by which all things with mass or energy—including planets, stars, galaxies, and even light—are brought toward one another. On Earth, gravity gives weight to physical objects, and the Moon's gravity causes the ocean tides.
A sloth weighing 7.52 kg hangs on a tree branch and has PE = 346 J. At what height (m) is the sloth above the ground
Answers
The sloth is 4.7m above the ground.
What is potential energy?Potential energy in physics is the energy that an item retains as a result of its position in relation to other objects, internal tensions, electric charge, or other elements.
The force acting on the two objects affects the potential energy formula. P.E. = mgh, where m is the mass in kilograms, g is the acceleration caused by gravity (9.8 m/s2 at the earth's surface), and h is the height in meters, is the formula for gravitational force.
Formula for PE=U=mgh
U=346J
m=7.52kg
h=?
346=7.52×9.8×h
346=73.6h
h=346/73.6=4.7m
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Where does diffusion occur in the excretory system
Answers
Answer:
Diffusion of water, salts, and waste products occurs in the kidneys. Diffusion of calcium from food into cells occurs in the intestines. Molecules are not the only things that can diffuse. Heat from the body diffuses away in the form of sweat that evaporates.
Explanation:
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A meteor that originally was heading east breaks up into two chunks. One of the chunks moves southeast. The second chunk was not immediately found, but scientists guessed that they should look for an object heading
northeast
west
southeast
north
Answers
Answer:
northeast
Good luck on your assignment!
Given 1 inch ≡ 2.54 cm and 1 foot ≡
12 inches, how many square centimeters are
in 3.22 ft2
?
Answers
Answer:
2991.47 [cm^2]
Explanation:
To solve this problem we must perform a dimensional analysis and use the corresponding conversion values:
\(3.22[ft^{2}]*\frac{12^{2}in^{2} }{1^{2}ft^{2}} *\frac{2.54^{2}cm^{2} }{1^{2}in^{2} } \\2991.47[cm^{2}]\)
Question 5 of 34
Which of the following terms applies to motion that is always along the same
straight line?
A. Three-dimensional motion
B. Projectile motion
C. Two-dimensional motion
D. One-dimensional motion
Answers
Answer: D. One-dimensional motion
Explanation:
Answer:
D.one dimensional motion
alcohol,monosodium glutamate (vetsin), water, fruit extract,sugar, coffe powder, salt, cow's milk, cocoa powder, liquid detergent. solute or both or solvent
Answers
Answer: solute: sugar, coffee powder, salt, cocoa powder, liquid detergent, monosodium glutamate (vetsin).
solvent: cow's milk, water, fruit extract
Explanation:
A solution is a mixture that is made up of two or more substances including solute and solvent.
The solute is one which can be dissolved in a liquid part that is solvent. The solute can be liquid or solid. Solutes are sugar, salt, coffee powder, cocoa powder, liquid detergent, monosodium glutamate.
The solvent is one which dissolves in it solute particles or molecules. Solvent are cow's milk, water, and fruit extract.
a 40 kg boy on a sheet of ice is initially at rest and is holding a 5 kg jug of water. He then throws the jug of water forward. If the jug has a final velocity of 3.0 m/s what is the final velocity of the boy
Answers
Answer:
mass of boy (M)=40kg
mass of jug(m)=5kg
both are at rest so (u)=0
v of jug=3m/s
v of boy=?
Now,
using PCLM
Mu+mu=Mv+mv
0=5*3+40v
v=-15/40 m/s
At a particular speed, a jumbo jet can travel its own length in 20 seconds. At this same speed, the jumbo jet taxied completely past a 710-foot-long hangar in 70 seconds, as shown. What is the length of the jumbo jet in feet
Answers
A jumbo jet can fly its whole length in 20 seconds at a certain speed and has a 284-foot length. The big jet taxied completely past a 710-foot-long hangar in 70 seconds while travelling at the same speed.
In physics, you can get average speed by dividing the total distance travelled by the total time needed to travel that distance. Speed is the rate of change in an object's position, expressed in metres per second. The rate at which an object travels a distance is considered its speed. High speed describes an object that is travelling quickly.
P should represent the plane's length in feet.
20p = (710+p)/20p = 14200+20p 50p = 14200 p = 284ft
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are same side exterior angles congruent or supplementary?
Answers
The same-side exterior angles are not congruent, they are supplementary. The same side exterior angles are formed and they have a sum of 180 degrees.
What is meant by congruence?Congruent refers to having the same precise size and shape. Even if we flip, turn, or rotate the forms, their shape and size need to remain constant. If it is possible to superimpose one geometric figure onto the other such that they correspond throughout, then the two are said to be congruent, or to be in the relation of congruence.
In general relativity, a congruence (more precisely, a congruence of curves) is the collection of integral curves of a (never vanishing) vector field in a four-dimensional Lorentzian manifold that is used to physically represent spacetime.
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A 6kg object is lifted to a height of 10m. How much PE does it have?
Answers
Answer:
588 J
Explanation:
P.E = mgh
= 6 * 9.8 * 10
= 588 J
if g value is rounded and taken as 10 then answer is 600 J.
Tarzan, who weighs 688 N, swings from a cliff at the end of a vine 18 m long. From the top of the cliff to the bottom of the swing,he descends by 3. 2 m. The vine will break if the force on it exceeds 950 N. (a) Does the vine break?(b) If no, what is the greatest force on it during the swing? If yes, at what angle with the vertical does it break?
Answers
From the given information about Tarzan,
a)No,the vine doesnot break.
b)The greatest force on it during the swing is 933N.
(a) To see if the vine breaks, it is adequate to inspect it right now Tarzan swings through the absolute bottom, which is the point at which the plant — in the event that it didn't break — would have the best strain. Picking a vertical positive, Newton's subsequent regulation prompts
T-mg=mv²/r
where r=18.0m and m=W/g=688/9.8=70.2kg. We see as the v²
from energy protection (where the reference position for the potential energy is at the absolute bottom).
mgh=(1/2)mv²
=>v²=2gh
where h=3.20m. Joining these outcomes, we have
T=mg+(m×2gh)/r=mg(1 + (2h/r))
=>T=70.2×9.8×[1+(2×3.2)/18]
=>T=687.96 × (1+ 6.4/18)
=>T=687.96 ×(1+0.355)
=>T=687.96×1.355
=>T=932.738N
Since,maximum force given is 950N ,therefore the vine doesn't break.
(b) Adjusting to a fitting number of huge figures, we see the greatest force is generally 9.3×10²N
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Evaluate the expression a+b when a=23 and b=45 . Write in simplest form
Answers
a + b = ?
23 + 45 = 68
Una rueda gira con una frecuencia de 530 rpm. Determina la velocidad angular, el periodo y la frecuencia.
Answers
Answer:
donde esta la bibliotekaaa
Explanation:
dfghj
Por definición de velocidad angular, periodo y frecuencia del M.C.U., la frecuencia, la velocidad angular y el periodo de la rueda son 8.833 Hz, 55.50 rad/s y 0.113 segundos respectivamente.
Movimiento Circular UniformeEl movimiento circular uniforme (M.C.U.) es un movimiento de trayectoria circular en el que la velocidad angular es constante. Esto implica que describe ángulos iguales en tiempos iguales.
En otras palabras, el M.C.U. describe el movimiento de un cuerpo con una rapidez constante y una trayectoria circular, cambiando en cada instante de dirección.
FrecuenciaLa frecuencia mide el número de revoluciones o vueltas completadas por unidad de tiempo. La frecuencia se expresa en s⁻¹ o Hertz (Hz).
Se define como:
f= ω÷ (2π) siendo ω la velocidad angular.
PeriodoEl periodo (T) es el tiempo que el cuerpo emplea en dar una vuelta completa; es decir que las características del movimiento son las mismas cada T segundos.
Se define como:
T= (2π)÷ ω siendo ω la velocidad angular.T= 1÷ f siendo f la frecuencia.Velocidad angular, periodo y frecuencia de una ruedaUna rueda gira con una frecuencia de 530 rpm. Expresada en las unidades correspondientes, la frecuencia de la rueda es:
f = 530rpm×\(\frac{1 min}{60 segundos}\)
f = 8.833 Hz
Siendo la frecuencia f= ω÷ (2π), entonces la velocidad angular es calculada como:
ω= f× (2π)
Entonces, la velocidad angular de la rueda es:
ω= 8.833 Hz× (2π)
ω= 55.50 rad/s
Finalmente, por definición de periodo, el periodo de la rueda es:
T= 1÷ 8.833 Hz
T=0.113 segundos
En resumen, la frecuencia, la velocidad angular y el periodo de la rueda son 8.833 Hz, 55.50 rad/s y 0.113 segundos respectivamente.
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¿Que le ocurre a un folículo después de liberar a un ovulo?
Answers
nesecitabas ayuda hace 1 hora, todavia la nesecitas?
Which law or theory is supported by the fact that different frequencies of sound waves maximally deform different parts of the basilar membrane?
a. opponent-process theory b. impulse frequency theory
c. place theory
d. the all-or-none law
Answers
The correct answer to your question is c. place theory among the law or theory is supported by the fact that different frequencies of sound waves maximally deform different parts of the basilar membrane .
The law or theory supported by the fact that different frequencies of sound waves maximally deform different parts of the basilar membrane is place theory.
The correct answer to your question is c. place theory. Place theory is supported by the fact that different frequencies of sound waves maximally deform different parts of the basilar membrane.
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in the absence of friction, how much work would a child do while pulling a 12 k g wagon a distance of 1.2 m with a 22 n force? a) 18 j b) 30 j c) 14 j d) 26 j
Answers
The work done by the child while pulling the 12 kg wagon a distance of 1.2 m with a 22 N force, in the absence of friction, is 26 J (joules).
The work done is calculated using the formula:
Work = Force × Distance × cos(θ)
Where:
Force is the applied force (22 N)
Distance is the displacement (1.2 m)
θ is the angle between the force and the direction of displacement (assuming it is 0 degrees, as there is no information provided regarding the angle)
Plugging the given values into the formula:
Work = 22 N × 1.2 m × cos(0) = 26 J
Therefore, the child would do 26 joules of work while pulling the wagon.
In conclusion, the correct answer is d) 26 J. The child would do 26 joules of work when pulling the 12 kg wagon a distance of 1.2 m with a 22 N force in the absence of friction. The calculation is based on the work formula, taking into account the given values.
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Q No. 01
A temperature of 162 oF is equivalent to what temperature in kelvins?
(a) 373 K (b) 288 K (c) 345 K (d) 201 K (e) 308 K
Answers
Answer:
346k
Explanation:
x-273/373-273=y-32/212-32
x-273/100=162-32/180
180(x-273)=13200
x-273=13200/180
x-273=73
x=73+273
x=346k
A far-sighted student has a near point of 322 cm. Calculate the focal length of the glasses needed so the near point will be normal (25 cm). Neglect the space between the eyes and the eye-glasses. Answer in units of cm.
Answers
Therefore, the focal length of the glasses needed is 80.32 cm. Far-sightedness or hyperopia is a type of refractive error in which distant objects are seen clearly, but nearby objects are blurry.
A person with hyperopia may have difficulty seeing objects up close. The near point is the closest point at which an object can be brought into focus.
The farthest point from which a person can see a clear image is called the far point. The near point for a far-sighted person is farther away than the normal near point of 25 cm.In order to calculate the focal length of the glasses needed for a far-sighted student, we need to use the lens formula, which relates the object distance, the image distance, and the focal length of a thin lens.
The lens formula is given as: 1/f = 1/do + 1/di, where f is the focal length, do is the object distance, and di is the image distance.To find the focal length of the glasses needed so that the near point is normal (25 cm), we need to find the image distance when the object distance is equal to the near point of the person (322 cm).
The image distance is given by:1/f = 1/do + 1/di1/f = 1/322 + 1/di1/di = 1/f - 1/3221/di = (322 - f)/322di = 322/(322 - f)When the near point is normal, the image distance is 25 cm. So we can write:di = 25 cm322/(322 - f) = 25 cm322 - f = 322/25f = 322 - 322/25f = (25 x 322 - 322)/25f = 80.32 cmTherefore, the focal length of the glasses needed is 80.32 cm.
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Finally, the switch on the electromagnet is reopened. The magnitude of the external magnetic flux through the wire loop ______ (A. increases, B. decreases, C. remains constant), and there is _______ (A. zero, B. a clockwise, C. a counterclockwise) current induced in the loop (as seen from the left).
Enter the letters corresponding to the responses that correctly complete the statement above. For example, if the correct answers are A and C, type A,C
________________
Now consider the new arrangement shown in the figure. (Figure 2) Note that the orientation of the battery is reversed with respect to the first arrangement you considered. Answer the following questions related to the arrangment with the new battery orientation.
Answers
The magnitude of the external magnetic flux through the wire loop decreases, and there is a counterclockwise current induced in the loop (as seen from the left).The correct answer is B, B.
When the switch on the electromagnet is closed, the magnetic field is generated. The magnetic flux passes through the loop, producing an emf and a current in the wire.The direction of the current induced in the wire can be found by Lenz's law, which states that the direction of the induced current will always be in such a way that it opposes the change producing it.In this case, the external magnetic flux through the wire loop will decrease because the magnetic field in the coil opposes the magnetic field of the electromagnet, as a result of which the direction of the induced current in the wire will be counterclockwise as seen from the left.When the switch is reopened, the magnetic flux through the wire loop decreases.
As a result of the decrease in the magnetic flux, the emf in the wire loop will be produced, and the direction of the induced current will be counterclockwise as seen from the left.
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20 J of energy transfers 80 mC of charge between two points in a time of 5.0 ms. Calculate:
a. The p.d between the points
b. The current
c. The power used
Answers
We can use the formula:
Energy (E) = Charge (Q) × Potential difference (V)
The potential difference between the two points can be found by rearranging the above formula as:V = E / Q = 20 J / 80 × 10^-3 C = 250 V
The current (I) can be found by using the formula:I = Q / t = 80 × 10^-3 C / 5.0 × 10^-3 s = 16 A
The power (P) used can be found using the formula:P = E / t = 20 J / 5.0 × 10^-3 s = 4,000 W
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Explain why tissues in multicellular organisms are supplied with nutrients using a circulatory system.
Answers
Answer:
The tissues in a multicellular organism requires a circulatory system in other to deliver oxygen and food to the tissues while also removing carbon dioxide and metabolic wastes due the complexity of these activities
Explanation:
Multicellular organisms are organisms that are made of more than one cell. the more cells an organism has the more complex certain activities might be for the organism hence the tissues in a multicellular organism requires a circulatory system in other to deliver oxygen and food to the tissues while also removing carbon dioxide and metabolic wastes
Which of the following technologies is based on the work of Subrahmanyan Chandrasekhar? A. Undersea fiber optic communications cables B. An orbiting observatory to detect X-rays from space objects C.Computer models to predict the effects of climate change D. Radar to detect the movement of storms
Answers
Answer:the answer is B
Explanation:
APE X
The technology that is based on the work of Subrahmanyan Chandrasekhar is an orbiting observatory to detect X-rays from space objects, therefore the correct option is B.
What is Chandrasekhar's limit?Chandrasekhar's limit is a type of maximum limited value that is used to define the maximum mass of a white dwarf star. The generally internationally considered value of the Chandrasekhar limit is about 1.44 times the mass of the sun which is approximately 2.765×10³⁰ kg.
In other words, one can say that Chandrasekhar limit is the maximum value that can attain 1.44 times the solar mass.
In other words, one can say that star with a mass more than 1.44 times that of the Sun does not form a white dwarf but continues to collapse, finally forming a neutron star
An orbiting observatory to detect X-rays from space objects is based on the principle of Chandrasekhar's limit. The correct option is B.
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a ball is thrown directly downward with an initial speed of 8.85 m/s, from a height of 29.9 m. after what time interval does it strike the ground?
Answers
It takes approximately 0.902 seconds time interval for the ball to strike the ground.
To determine the time interval it takes for the ball to strike the ground, we can use the equations of motion. Since the ball is thrown directly downward, we can assume that the initial velocity (u) is negative (-8.85 m/s), and the acceleration due to gravity (g) is positive (9.8 m/s²).
The equation to calculate the time of flight (t) is
t = (v - u) / g
Where:
v = final velocity (when the ball strikes the ground)
u = initial velocity
g = acceleration due to gravity
In this case, the final velocity when the ball strikes the ground is 0 m/s (as it comes to rest). So, substituting the given values into the equation, we have
t = (0 - (-8.85)) / 9.8
t = 8.85 / 9.8
t = 0.902 seconds
Therefore, it takes approximately 0.902 seconds for the ball to strike the ground.
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What is the first step needed to solve ? (1 point)
(03.04 LC)
What is the first step needed to solve (3/4)x - 3 = 18
Select one:
a. Add 3 to both sides
b. Subtract 18 from both sides
c. Multiply both sides by 3
d. Divide both sides by 4
Answers
Answer:
answer is add 3 to both sides
explain the difference between the latitude/longitude coordinate and utm coordinate systems
Answers
The latitude/longitude system is the most widely used and is often used to identify a location on a global scale. UTM coordinates are often used in local-scale mapping applications.
It comprises a framework of lines or grids that encircle the planet and make it possible to specify locations with great precision. Two widely used geographic coordinate systems are the latitude/longitude and the Universal Transverse Mercator (UTM) coordinate systems.
The difference between the latitude/longitude coordinate system and the UTM coordinate system are listed below:Latitudes and longitudes are calculated with reference to the Earth's center of gravity. The coordinates are represented in the form of (latitude, longitude).On the other hand, UTM coordinates are projected.
This means that the globe is flattened and projected onto a two-dimensional plane. UTM divides the earth into 60 zones, with each zone covering a span of six degrees of longitude. UTM divides each zone into 20 parallel bands that are equally spaced.
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What property of sound does a decibel measure
Answers
How is speed different from velocity?
Answers
Answer:Speed is the time rate at which an object is moving along a path
Velocity is the rate and direction of an object's movement.
Explanation:
Hope it helps
Which of the following best describes the circuit shown below?
A. Short
B. Combination
C. Series
D. Parallel
Answers
Answer:
The answer is C. Series.
Which of the following is an example of Potential Energy?
A Bell Ringing
An apple on a tree branch
Taking X-rays
Lightning