A 50.0 g block of copper whose temperature is 400 K is placed in an insulating box with a 100 g block of lead whose temperature is 200 K. (a) What is the equilibrium temperature of the twoblock system? (b) What is the change in the internal energy of the system between the initial state and the equilibrium state? (c) What is the change in the entropy of the system?
Answers
a) The equilibrium temperature of the two block system is 320k
b) The change in the internal energy of the system is zero.
c) The change in entropy is +1.72kj
a) We refer. to the copper. block as block. 1 and the lead block. as block 2. The equilibrium temperature T satisfies
m1c1 (T - Ti) + m2c2 (T - TI2) = 0
T = m1C1Ti1 + m2C2Ti2 / m1C1 + m2C2 = 50 × 386×400 + 100×128×200/50×386 + 100×128 = 320K
T = 320K
b)The internal energy of the two-block system does not change because it is thermally isolated from the outside environment.
C)The change in entropy is ΔS = ΔS1 + ΔS2 = m1c1ln(T /Ti) + m2c2ln(T/Ti)
Δs = +1.72kj
A state of disorder, randomness, or uncertainty is most frequently connected with the scientific notion of entropy, which is also a quantifiable physical attribute. The notion and the phrase are employed in a variety of disciplines, including classical thermodynamics, where they were initially identified, statistical physics, which describes nature at the molecular level, and information theory. It has wide-ranging uses in physics and chemistry, biological systems and how they relate to life, cosmology, economics, sociology, weather science, and information systems, particularly the transfer of information through telecommunication.
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Related Questions
1. A block with a mass of 0.28 Kg is attached to a horizontal spring. The block is pulled back from its equilibrium position until the spring exerts a force of 1.0 N on the block. When the block is released, it oscillates with a frequency of 1.2 Hz.
a. How far was the block pushed back till it was released?
b. Find the maximum Potential energy of the block.
c. Find the maximum Kinetic energy of the block.
d. Find the maximum velocity of the block.
e. Find the velocity of the block at a distance of half the amplitude.
f. Find the force and acceleration at a distance of half the amplitude position.
Answers
The displacement x = -0.098 m
The maximum potential energy of the block = 0.049 J
The maximum kinetic energy of the block = 0.075 J
The maximum velocity of the block = 0.73 m/s
The velocity of the block at a distance of half the amplitude.= 0.60 m/s
How to find the maximum Potential energy of the blockTo solve this problem, we will use the equations of motion for a mass-spring system.
The frequency of oscillation is given by:
f = 1/2π * √(k/m)
where
f is the frequency of oscillation, k is the spring constant, and
m is the mass of the block.
The force exerted by the spring is given by:
F = -kx
where
F is the force,
k is the spring constant, and
x is the displacement from the equilibrium position.
a. To find the displacement x, we can use the force equation:
1.0 N = -kx
using the equation for frequency:
1.2 Hz = 1/2π * √(k/0.28)
Solving for k, we get:
k = (1.2*2π)^2 * 0.28
k = 10.17 N/m
Now we can solve for x:
1.0 N = -(10.17 N/m) * x
x = -1.0 N / (10.17 N/m)
x = -0.098 m
b. The maximum potential energy of the block occurs at the maximum displacement from equilibrium, which we can find using the displacement x we just calculated:
= (1/2)kx^2 = (1/2)(10.17 N/m)(-0.098 m)^2 = 0.049 J
c. The maximum kinetic energy of the block occurs at the equilibrium position, where the velocity is maximum:
K_max = (1/2)mv^2
We can find the velocity using the frequency and the displacement:
v_max = 2πf * |x| = 2π(1.2 Hz)(0.098 m) = 0.73 m/s
Plugging in the values,
K_max = (1/2)(0.28 Kg)(0.73 m/s)^2 = 0.075 J
d. The maximum velocity = 0.73 m/s
e. To find the velocity of the block at a distance of half the amplitude, we can use the conservation of energy:
K_max + U_max = (1/2)kx^2 + (1/2)mv^2
At half the amplitude, the displacement is x/2:
K_max + U_max = (1/2)k(x/2)^2 + (1/2)mv^2
Solving for v, we get:
v = √[(K_max + U_max - (1/2)k(x/2)^2)/(1/2)m]
Plugging in the values, we get:
v = √[(0.075 J + 0.049 J - (1/2)(10.17 N/m)((-0.098 m)/2)^2)/(1/2)(0.28 Kg)]
v = 0.60 m/s
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what is the best structure for a egg dropping project you will be name brainiest
Answers
Answer:
bubble wrap in stuff animal
Explanation:
did it
Answer:
i would say putting like pillows around it i had to do it once and i won like that so
Explanation:
9. Rob Colley set a record in “pole-sitting" when he spent 42 days in a barrel at the
top of a flagpole with a height of 43 m. Supposed a friend wanting to deliver an ice-
cream sandwich to Colley throws the ice cream straight up with just enough speed
to reach the barrel. How long does it take the ice-cream sandwich to reach the
barrel?
Answers
Answer:
3 sec
Explanation:
T=squareroot((2*-43)/-9.81)
A girl with a mass of 32 kg is playing on a swing. There are three main forces
acting on her at any time: gravity, force due to centripetal acceleration, and
the tension in the swing's chain (ignore the effects of air resistance). At the
instant shown in the image below, she is at the bottom of the swing and is
traveling at a constant speed of 4 m/s. What is the tension in the swing's
chain at this time? (Recall that g = 9.8 m/s²)
Tension
Weight
A. 333.6 N
OB. 817.8 N
C. 562.8 N
D. 441.6 N
4 m/s
Answers
The tension in the swing's chain at the instant shown in the image is 441.6 N.
option D
What is the tension at bottom swing?At the bottom of the swing, the girl is traveling at a constant speed, so her acceleration is zero. Therefore, the net force acting on her is also zero.
Thus, we have:
0 = T - mg - mv²/r
where;
T is the tension in the swing's chain, m is the girl's mass, g is the acceleration due to gravity, v is her speed, and r is the radius of the swing.At the bottom of the swing, the radius is equal to the length of the chain, so we have:
r = L = 4.0 m
Substituting the values we have:
T = (32 kg)(9.8 m/s²) + (32 kg)(4 m/s)²/4.0 m
Solving for T, we get:
T = (32 kg)(9.8 m/s²) + (32 kg)(4 m/s)²/4.0 m
T = 441.6 N.
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A surveyor measures the distance across a straight river by the following method: Starting directly across from a tree on the opposite bank, he walks x = 118 m along the riverbank to establish a baseline. Then he sights across to the tree. The angle from his baseline to the tree is = 33.4°. How wide is the river?
Answers
Answer:
68.5 meters
Explanation:
To solve this problem, we can use trigonometry and create a right triangle with the river as the hypotenuse.
Let's call the width of the river "w". We can use the sine function to find the length of the opposite side of the triangle (the distance from the surveyor to the tree).
sin(33.4°) = opposite/hypotenuse
sin(33.4°) = w/x
w = x * sin(33.4°)
w = 118 m * sin(33.4°)
w = 68.5 m
Therefore, the width of the river is approximately 68.5 meters.
A 6.30-N force is applied to a 4.5-kg object to accelerate it rightwards. Neglecting any frictional forces, what is the acceleration of the object?
Answers
Answer:
1.4 m/s2
Explanation:
i took the test
What is a small portable device that counts every step taken throughout the day?
A.stethoscope
B.pedometer
C.otoscope
D.thermometer
Answers
Answer: B
Explanation: i learned it last year
Pedometer is a small portable device that counts every step taken throughout the day. The correct option is (B).
A pedometer is a small portable device that counts the number of steps taken by an individual throughout the day. It is typically worn on the waist or carried in a pocket and uses a mechanism to detect body motion and count each step.
Pedometers are commonly used for tracking physical activity and encouraging individuals to achieve daily step goals as part of their fitness routines.
Therefore, Pedometer is a small portable device that counts every step taken throughout the day. Choose the option (B).
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Which situation does NOT show kinetic energy? *
PLS ANSWER ASAPPPP
Answer options:
A. a hockey puck sliding on the ice
B. a baseball in a catcher's glove
C. a lady walking slowly across the street
D. a man running around a track
Answers
"Kinetic" energy is the energy of motion.
The ball in the glove is not moving. It's just laying there. (B)
So it has no kinetic energy.
All the other choices describe something moving, so they all have some.
If two runners are running in a 500 meter dash and runner #1 finishes in 25 seconds and runner #2 finishes in 27 seconds. What are the speeds of both runners? Which one is faster
Answers
For two runners running in a 500 meter dash and runner, the speeds of both runners is mathematically given as
v1=25m/s
v2=20m/s
and the first runner is faster
What are the speeds of both runners?Generally, the equation for the speed is mathematically given as
v=d/t
Therefore, for first runner
v=500/20
v1=25m/s
For 2nd runner
v=500/25
v2=20m/s
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Demario's biology class has a quiz every other Friday. This is the third time Demario has been so worried about other personal matters that he hasn’t done quite as well on the quizzes as he might have otherwise. What has Demario upset is the fact that the professor leaves the room while the students take the quiz, and over half the class is taking the opportunity to cheat. Demario knows personally several of the other students in the class, and some of the ones Demario hangout with are among those who are cheating. Demario knows that a failure to speak to the professor about the cheating will result in his own grade being lower, since the school grades on the curve system. But if Demario does say something to the professor he will be doing his friends and the others a great harm, since cheating is taken very seriously at the school and can lead to expulsion. If Demario doesn’t “turn in” the classmates, the only other alternative is he will get a worse grade than he deserves. He will also be labled as a snitch among is peers and a cheater at the school, either of which Demario has never done. Further, if the professor somehow discovers that Demario is hiding the cheating of others, Demario will be considered an accessory to the cheating, and may be reprimanded for not turning others in, since the school operates on an honor system.
Critical thinking About Ethics Right vs Wrong
What should Demario do?
Should Demario cheat?
Should Demario turn in the cheating classmates?
Should Demario say nothing and not cheat himself?
Be specific in your answer about exactly what Demario should do. (Remember to use one of the three moral theories to solve this dilemma.)
Answers
1. It is unethical for Demario to cheat
2. Demario should not engage in cheating himself
3. Demario should not turn in cheating classmates without careful consideration
4. Reporting classmates may harm relationships, create animosity, and potentially lead to severe disciplinary actions.
What is ethics?A virtue ethics perspective may also be useful in this circumstance. Demario should make an effort to respect moral principles like honesty, fairness, and integrity while taking the potential repercussions into account and exhibiting empathy for his fellow students.
By employing this strategy, Demario behaves responsibly, deals with the problem subtly, encourages fairness in the educational setting, and upholds his or her own moral standards.
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What/Where is the area of the mantle is reaching the Earths surface?
Answers
Explanation: The mantle is divided into several layers: the upper mantle, the transition zone, the lower mantle, and D” (D double-prime), the strange region where the mantle meets the outer core. The upper mantle extends from the crust to a depth of about 410 kilometers (255 miles).
Pls help and explain how to get the answer
Answers
(a) The magnitude of the gravitational force on the rock is 64.68 N and on the pebble is 5.488 x 10⁻³ N.
(b) The acceleration of each object is equal to acceleration due to gravity, = 9.8 m/s².
What is the gravitational force exerted on each object?The gravitational force exerted on each object is calculated by applying Newton's law of universal gravitation as follows;
Fg = Gm₁m₂ / R²
where;
G is universal gravitation constantm₁ is the mass of the rockm₂ is the mass of pebbleThe acceleration of each object will be constant and equal to acceleration due to gravity, the force on each object is calculated by using Newton's second law of motion.
Force on the rock;
F = mg
where;
g is acceleration due to gravityF = 6.6 kg x 9.8 m/s²
F = 64.68 N
The force on the pebble;
F = mg
F = 5.6 x 10⁻⁴ x 9.8
F = 5.488 x 10⁻³ N
Thus, the acceleration of each object is equal to acceleration due to gravity, = 9.8 m/s².
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2(a)Find the density of air filled in polythene container with mass of 0.419kg when it is empty. When filled with extra air its mass increased to 0.428kg also the top of polythene container mass connected to the perplex box of volume 1000cm³ and the number of times of air inside was 7.2 times
Answers
When filled with extra air its mass increased to 0.428kg also the top of polythene container mass connected to the perplex box of volume 1000cm³ and the number of times of air inside was 7.2 times. The density of the air filled in the polythene container is approximately 1.25 kg/m³.
The density of air filled in the polythene container can be determined by considering the change in mass and volume of the container before and after filling it with air. Given that the mass of the empty container is 0.419 kg and the mass of the container when filled with extra air is 0.428 kg, and the volume of the perplex box is 1000 cm³.
Calculate the mass of the air inside the container by subtracting the mass of the empty container from the mass of the container when filled with air:
Mass of air = Mass of filled container - Mass of empty container
= 0.428 kg - 0.419 kg
= 0.009 kg
Calculate the volume of the air inside the container using the given number of times the air inside is 7.2:
Volume of air = Volume of perplex box * Number of times air inside
= 1000 cm³ * 7.2
= 7200 cm³
Convert the volume of air to cubic meters (m³) by dividing by 1000000:
Volume of air = 7200 cm³ / 1000000
= 0.0072 m³
Calculate the density of air using the formula:
Density = Mass / Volume
Density = 0.009 kg / 0.0072 m³
≈ 1.25 kg/m³
Therefore, the density of the air filled in the polythene container is approximately 1.25 kg/m³.
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How are magnetic fields like vectors?
Answers
Answer:Magnetic fields from two sources add up as vectors at each point, so the strength of the field is not necessarily the sum of the strengths1. Magnetic fields are vectors, which means they have direction as well as size. Therefore, the sum of two magnetic fields is not simply the sum of their magnitudes2.
Explanation:
A race car makes one lap around a track of radius 50 m in 9.0 s
Answers
The angular speed of the race car is 0.698 rad/s and the linear speed is 35 m/s.
What is the angular speed of the car?The angular speed of the race car is calculated by applying the following kinematic equation as follows;
ω = θ/t
where;
θ is the angular displacementt is the time of motionω = 2π/9
ω = 0.698 rad/s
The linear speed of the race car is calculated as shown below;
v = ωr
where;
ω is the angular speed of the carr is the radius of the circular pathv is the linear speedv = 0.698 rad/s x 50 m
v = 35 m/s
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The complete question is below:
A race car makes one lap around a track of radius 50 m in 9.0 s. Find the angular speed and linear speed of the race car.
What is the only difference between the reactant and product side of a chemical reaction?
Answers
Answer:
Products is the result. Reactants produce the result
Explanation:
,,
I am not sure if this is true or false. Please help
Answers
We have the formula of Newton's second law
\(F=ma\)Where F is the force, m is the mass and a is the acceleration.
If we isolate the acceleration
\(a=\frac{F}{m}\)As we can see if the mass increases the acceleration will decrease
Therefore the answer is FALSE
The x-axis of a position-time graph represents
Answers
Answer:
The y-axis represents position relative to the starting point, and the x-axis represents time.
Explanation:
a bag of sugar has a mass of 2.26 kg. what is its weight
Answers
Answer:
2260
gimme brainliest rn
It is often illustrated in art, popular culture and everyday conversation that the Sun is Yellow. a. Using Wien’s Law and what you learned in class about the Sun’s temperature, explain why this is not true in reality. (20 points) b. In reality, what is the Sun’s true color? Why is this true? (20 points)
Answers
Answer:
a) surface λ = 5 10⁻⁷ m
nuecleus λ= 2,890 10⁻⁹ m
there is a mixture of wavelengths giving rise to white light
b) True color sun is White
Explanation:
Wien's law establishes a relationship between the temperature of a star and the maximum wavelength emitted
λ T = 2,898 10⁻³
if we calculate the wavelength of the Sun
T = 5800K λ = 5 10⁻⁷ m = 5000 nm
this is the surface temperature
in the part of the internal Sunspart (Nucleus) about 10⁶ degrees this is where the nuclear reaction occurs
in this region the photons are very short λ
λ = 2,890 10⁻³ / 106
λ= 2,890 10⁻⁹ m
these photons are absorbed and emitted on their way to the surface of the sun many times, therefore there is a mixture of wavelengths giving rise to white light
b) Sunlight when it reaches Earth is absorbed by atmospheric gases, mainly Blue, as it is absorbed by Nitrogen, it lets through mainly red and red
True color sun is White
In a certain lab experiment, a spring gun was placed on a table and fired a steel ball horizontally outward. A student determines that the ball starts 1.0 m above the floor and travels 2.7 m before striking the floor
In a certain lab experiment, a spring gun was placed on a table and fired a steel ball horizontally outward. A student determines that the ball starts 1.0 m above the floor and travels 2.7 m before striking the floor.
(a) Determine the time that the ball is in the air. (2 pts)
(b) Determine the initial velocity of the ball. (2 pts)
Answers
a) The time that the ball is in the air is 0.23 second.
b) The initial horizontal velocity of the ball is 11.74 m/s.
What is velocity?
The rate at which a body's displacement changes in relation to time is known as its velocity. Velocity is a vector quantity with both magnitude and direction.
Vertical height of the point = 1.0 meter.
The horizontal distance travelled by the ball = 2.7 m.
a) The time that the ball is in the air is = √(H/2g)
= √(1.0/2×9.8)
= 0.23 second
b) The initial horizontal velocity of the ball is = 2.7 m/0.23 s
= 11.74 m/s
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what is acceleration due to gravity
Answers
Answer:
Abstract. The acceleration due to gravity, denoted by the symbol g, is the acceleration of a body caused by the force acting on the body due to the earth's gravitational field. This force can be written as mg, where m is the mass of the body.
Explanation:
Name:.
Date:
Homework: Writing an Argument About
Australia's Skin Cancer Rate
G
4
You now have enough evidence to explain why Australia's skin cancer rate is so high. Review your
argument from Chapter 2 and think about how you will convince the AHA that both Claim 2 and
Claim 3 are accurate. You will use your completed Reasoning Tool from Activity 3 to revise and add to
your argument.
Question: Why is the skin cancer rate in Australia so high?
Answers
Describe one common critique or criticism of Utilitarianism. To what extent do you agree or disagree with this criticism?
Answers
help asap According to your data, what trend exists between the independent variable and the dependent variable? Make sure to use terms like “positive”, “negative”, or “neutral” to describe the trend. Add your reasoning. 100pts
Answers
Answer:
Explanation:
Please post if there is a graph showing the data.
Without a graph, in general the trend can be described as:
"positive" when the dependent variable increases with an increase in independent variable
"negative" when the dependent variable decreases with an increase in independent variable
"neutral" when the dependent variable remains the same with an increase or decrease in independent variable
Speed of Sound Lab. (Please answer each question with the # it matches with.)
Answers
In air, sound travels at a computed speed of 340 m/s.
The speed of sound in air is influenced by a number of factors, including temperature, humidity, and atmospheric pressure. However, under normal atmospheric conditions—a temperature of 20 degrees Celsius or 68 degrees Fahrenheit, a relative humidity of 50%, and a pressure of one atmosphere—the speed of sound in dry air is around 343 metres per second (1,125 feet per second). This number is typically rounded to 340 m/s for convenience.
Speed is the pace at which a distance changes in relation to time. v = dx + dt, etc. Speed may also be described as a function of time and distance. Specifically, speed is equal to distance times time. Its symbol is v, and the SI unit for it is m/s. It has a scalar value. Speed is a measure of how far something can go in a given amount of time. Using the formula Speed = Distance Time, one may determine the dimension of speed. Distance is measured in units of [L1], while time is measured in units of [T1]. Dividing distance by time results in [L1] [T1] = [L1T1]. [L1T]1 is the dimension for speed.
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The current in a 120-V reading lamp is 2.6 A. If the cost of electrical energy is $0.075 per kilowatt-hour, how much does it cost to operate the light for an hour
Answers
Answer:
P(power) = I V = 2.6 * 120 = 312 J/s
P = 312 J/s / 1000 J/kw ]= .312 kw/sec
E = P * t = .312 kw energy used in 1 sec by bulb
To use .312 kw for an hour costs $.075
So .312 * .075 = .0234 $ = 2.34 cents each hour
The current in a 120-V reading lamp is 2.6 A. If the cost of electrical energy is $0.075 per kilowatt-hour, then it would cost 0.0234 $.
What is power?The rate of doing work is known as power. The Si unit of power is the watt.
Power = work / time
The mathematical expression for the power is as follows,
P = VI
As given in the problem , the current in a 120-V reading lamp is 2.6 A. If the cost of electrical energy is $0.075 per kilowatt-hour,
Power consumed by the lamp = 120 × 2.6
= 312 watts
The cost of operating for an hour = 312 × $0.075 / 1000
= 0.0234 $
Thus, the current in a 120-V reading lamp is 2.6 A. If the cost of electrical energy is $0.075 per kilowatt-hour, then it would cost 0.0234 $.
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What is the angular momentum of the particle relative to the origin when an object of mass m is moved along a fixed elliptical path by r=(i^ acos t + j^ bsin t ) under the action of a force field?
Answers
Angular momentum L = I ω where I = mr² and ω = vr L = mr² × vr L
What is Angular momentum?The characteristic of any rotating object determined by the product of the moment of inertia and the angular velocity is known as angular momentum. It is a characteristic of rotating bodies determined by the sum of their moment of inertia and angular velocity.
Rotational inertia and angular velocity combine to form an object's angular momentum. The rate at which an object is turning is measured by its angular velocity. The challenge of turning an object is its rotational inertia.
When an object is rotating, its moment of inertia (I) and angular velocity () are multiplied together to form the term "angular momentum." A vector quantity is angular momentum. Kg. m2. s-1 is the SI unit for angular momentum.
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which quanities are scalars
Answers
Answer:
they are quantities with magnitude without direction e.g weight,
A boy slides a book across the floor, using a force of 5 N over a distance of 2
m. What is the kinetic energy of the book after he slides it? Assume there is
no friction.
A. 5 J
B. 10 J
C. 20 J
D. 2.5 J
SUBMIT
Answers
The kinetic energy of the book after it is slids a distance of 2 meters will be 10 Joules.
How to determine the kinetic energy of an object?The work-energy theorem states that "the work done on an object is the change in its kinetic energy".
Hence;
Kinetic energy = work done
Note that: work-done is expressed as:
Work done = f × d
Where f is force applied and d is distance traveled.
Given that:
Force applied f = 5 newton
Distance d = 2 meters
Work done = ?
Plug these values into the above formula and solve for the workdone.
Work done = f × d
Work done = 5N × 2m
Work done = 10Nm
Work done = 10 Joules
Therefore, the kinetic energy is 10 Joules.
Option B) 10 J is the correct answer.
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