Which thermodynamic process takes place at a constant temperature so that the internal energy of a system remains unchanged?
A.
the isovolumetric process
B.
the isobaric process
C.
the adiabatic process
D.
the isothermal process
Answers
Answer:
D
Explanation:
Isothermal process is one that occurs on constant temperature example the vaporisation of water on boiling in an enclosed space .
At this time the temperature of the system remains constant .
Answer:
D. the isothermal process
Explanation:
Related Questions
Which of the following is an accurate example of Newton's third law?
1= A girl is able to pull a sled by exerting greater force on the sled than the sled exerts on her, this produces a net force on the sled.
2= A hockey puck slides at constant velocity on frictionless ice.
3= A punter kicks a football high into the air, the force on the person's foot is less than the force on the football
4= none of the above
Answers
Explanation:
I belive it is 1 or 4
Answer:
I believe the answer is 4
Explanation:
4= none of the above
which of the following best explains the role of social facilitation in accounting for the results of Study 2? (participants performed quickly while putting on familiar clothing, and more slowly when dressing in unfamiliar clothing)
a. individuals perform more efficiently when they know they are being observed compared to when they know they are not being observed
b. individuals prefer to perform familiar tasks in the presence of others but unfamiliar tasks when alone
c. an individual's performance is less predictable when acting in the presence of others than when acting alone
d. the impact that the presence of others has on an individual's performance depends on the nature of the task
Answers
The correct option that best explains the role of social facilitation in accounting for the results of Study 2 is (a) individuals perform more efficiently when they know they are being observed compared to when they know they are not being observed.
Social facilitation is the term used to describe the process where the presence of others can affect the way that an individual performs a task. According to the definition, when an individual's performance improves in the presence of others, this is called social facilitation. In this study, when participants dressed in familiar clothing, they performed quickly, but when dressing in unfamiliar clothing, they performed more slowly. This means that the social facilitation took place, which resulted in an improvement in their performance while wearing familiar clothing.
Therefore, the correct answer is option (a) individuals perform more efficiently when they know they are being observed compared to when they know they are not being observed.
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The following statements that correctly describe the modulus of elasticity, E:
Answers
The modulus of elasticity, E, is a measure of a material's stiffness and ability to resist deformation when a force is applied. It is defined as the ratio of stress to strain within the elastic range of the material. In other words, it describes how much a material will stretch or compress under a given force.
The modulus of elasticity is important because it allows engineers to predict how materials will behave under different conditions, such as temperature changes, loading conditions, and other factors. It also helps to determine the maximum load a material can withstand before it starts to deform or break.
In detail, the modulus of elasticity is a fundamental property of a material that describes its ability to resist deformation when subjected to external forces. It is calculated by measuring the stress and strain of the material and using the equation E = σ/ε, where σ is stress and ε is strain.
The modulus of elasticity is important in many areas of engineering, such as structural design, materials science, and mechanics. It helps to ensure that structures and materials are designed and tested to withstand the loads and stresses they will be subjected to, and it provides a basis for comparing different materials and choosing the best one for a particular application.
In summary, the modulus of elasticity, E, is a material property that describes its stiffness and resistance to deformation. It is correctly determined using Hooke's Law and is crucial for predicting the mechanical behavior of materials when subjected to stress.
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You keep a chalkboard eraser pressed against the chalkboard by using your finger to exert a horizontal force on the back of the eraser.
Which type of force (call it force A) keeps the eraser from falling?
Normal force
Kinetic friction
Gravitational force
Static friction
Answers
Static friction is the type of force (force A) that keeps the eraser from falling when it is pressed against the chalkboard. The static friction force arises when two surfaces are in contact and there is no relative motion between them.
The force that keeps the eraser from falling is static friction. When the eraser is pressed against the chalkboard, a normal force (due to gravity) acts on it, pushing it perpendicular to the surface. Simultaneously, a horizontal force is exerted on the eraser by the finger. The static friction force arises as a response to this applied force, acting in the opposite direction to prevent the eraser from sliding down. As long as the applied force does not exceed the maximum static friction force, the eraser remains stationary. Once the applied force exceeds this threshold, the static friction force can no longer oppose it, and the eraser begins to slide, transitioning to kinetic friction.
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A sack of potatoes weighing 200 N
falls from an airplane. As the
velocity of fall increases, air
resistance also increases. When air
resistance equals 200 N, the sack's
acceleration becomes
A) 0 m/s2.
B) 10 m/s2.
C) 5 m/s2.
D) infinite.
E) none of the above
Answers
As the sack of potatoes falls from the airplane, it experiences a gravitational force of 200 N downwards. However, as its velocity increases, air resistance also increases, acting in the opposite direction to the force of gravity. Eventually, the air resistance will become equal to the gravitational force, resulting in a net force of zero and a constant velocity (i.e. acceleration of 0 m/s²). Therefore, the correct answer is option A, 0 m/s². It is important to note that the acceleration of the sack of potatoes is not infinite (option D) as there is a limit to the amount of air resistance it can experience. Option E (none of the above) is also incorrect as one of the options must be correct.
When a sack of potatoes weighing 200 N falls from an airplane, the velocity of fall increases, and so does the air resistance. When the air resistance equals 200 N, the sack's acceleration becomes:
A) 0 m/s^2.
To understand why this is the correct answer, follow these steps:
1. The sack experiences a downward force due to gravity, which is equal to its weight (200 N).
2. As it falls, the velocity increases, leading to an increase in air resistance acting upward.
3. When the air resistance equals the downward force (200 N), the two forces are balanced, meaning there is no net force acting on the sack.
4. Since net force is equal to mass times acceleration (F = ma), if the net force is zero, the acceleration must also be zero.
So, the sack's acceleration becomes 0 m/s^2 when the air resistance equals its weight.
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Boat Engine An engine moves a boat through the water at a constant speed of 15 m/s. The engine must exert a force of 6.0 kN to balance the force that the water exerts against the hull. What power does the engine develop
Answers
An engine moves a boat through the water at a constant speed of 15 m/s. The engine must exert a force of 6.0 kN to balance the force that the water exerts against the hull. Power is the measure of how fast work can be done. The unit of power is watts (W), which can be defined as the amount of work done in one second.
Power is usually calculated as the product of the amount of work done and the time it takes to do it. Power can also be defined as the rate at which work is done.First, we need to calculate the work done by the engine. Work = Force x distance . Since the boat moves at a constant speed of 15 m/s, we can use the following formula to calculate the distance traveled by the boat:Distance = Speed x TimeTherefore, distance = 15 m/s x 1 s = 15 m Now we can calculate the work done by the engine:Work = Force x Distance = 6.0 kN x 15 m = 90 kJNow that we know the amount of work done by the engine, we can use the formula for power:Power = Work/Time Since we don't know the time it took the engine to do the work, we can't calculate power directly. However, we can make some assumptions and estimate the time it took the engine to do the work. For example, if we assume that the engine did the work in one minute, then the time is 60 seconds:Power = Work/Time = 90 kJ/60 s = 1.5 kWTherefore, the power developed by the boat engine is 1.5 kW.For such more question on measure
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A 250-kg moose stands in the middle of the railroad tracks in Sweden, frozen by the lights of an oncoming 10,000kg train traveling at 20m/s. Even though the engineer attempted in vain to slow the train down in time to avoid hitting the moose, the moose rides down the remaining track sitting on the train’s cowcatcher. What is the final velocity of the train and moose after the collision?
(Momentum & Impulse)
Answers
Answer:
The final velocity of the train and the moose after collision is approximately 19.51 m/s
Explanation:
The given mass of the moose, m₁ = 250 kg
The velocity of the moose, v₁ = 0
The mass of the oncoming train, m₂ = 10,000 kg
The velocity of the train, v₂ = 20 m/s
The velocity of the moose and the train after collision = v₃
By the principle of conservation of linear momentum, the total initial momentum before the collision = The total final momentum after collision
m₁·v₁ + m₂·v₂ = (m₁ + m₂)·v₃
Therefore, by substitution, we have;
250×0 + 10,000× 20 = (10,000 + 250) × v₃
200,000 = 10,250 × v₃
v₃ = 200,000/10,250 ≈ 19.51 m/s
The final velocity of the train and the moose after collision = v₃ ≈ 19.51 m/s
the kinetic energy of an electron traveling at 0.98c is
Answers
The kinetic energy of an electron traveling at 0.98c is approximately 1.24 × 10⁻¹² J.
The kinetic energy of an electron traveling at 0.98c is.Kinetic energy of an electron traveling at 0.98c is calculated below:
Velocity of an electron, v = 0.98c
Speed of light, c = 3 × 10^8 m/s
We know that Kinetic energy of an electron = (1/2) mv², where m = mass of electron and v = velocity of electron.
We have to calculate the kinetic energy of an electron traveling at 0.98c.
Kinetic energy of an electron is given by (1/2) mv²... equation [1]
The relativistic kinetic energy of a particle is given by the following equation: K = [(γ - 1)mc²]... equation [2],
where m is the mass of the particle, c is the speed of light, and γ is the Lorentz factorγ = 1 / sqrt[1 - (v²/c²)]... equation [3]
Substituting the given data in equation [2], we get: γ = 1 / sqrt[1 - (v²/c²)]γ = 1 / sqrt[1 - (0.98c/c)²]γ = 1 / sqrt[1 - 0.98²]γ = 1 / sqrt[0.0396]γ = 1 / 0.199Γ = 5.02
Substituting the value of γ in equation [2], we get: K = [(γ - 1)mc²]K = [(5.02 - 1) × 9.1 × 10⁻³¹ kg × (3 × 10⁸ m/s)²]K = [(4.02) × (9.1 × 10⁻³¹) × (9 × 10¹⁶)]K = 3.65 × 10⁻¹³ J
We know that Kinetic energy of an electron = (1/2) mv²... equation [1]
Substituting the value of m, v and K in the equation [1], we get: K = (1/2) mv²⇒ 3.65 × 10⁻¹³ J = (1/2) × (9.1 × 10⁻³¹) × (0.98c)²⇒ 3.65 × 10⁻¹³ J = (1/2) × (9.1 × 10⁻³¹) × (0.98 × 3 × 10⁸)²⇒ 3.65 × 10⁻¹³ J = 1.24 × 10⁻¹² J (approx.)
Hence, the kinetic energy of an electron traveling at 0.98c is approximately 1.24 × 10⁻¹² J.
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A wave has a speed of 500 m/s and a frequency of 25 Hz. What is the wavelength of this wave in metres?
Answers
Answer:
20 mExplanation:
The wavelength of a wave can be found by using the formula
\(\lambda = \frac{c}{f} \\\)
where
c is the speed of the wave
f is the frequency
From the question
c = 500 m/s
f = 25 Hz
We have
\( \lambda = \frac{500}{25} \\ = 20\)
We have the final answer as
20 mHope this helps you
a parallel-plate capacitor has a plate separation of 4.00 mm. 1) if the material between the plates is air, what plate area is required to provide a capacitance of 3.00 pf? (express your answer to three significant figures.)
Answers
To get a capacitance of 3.00 pF with a plate separation of 4.00 mm and air between the plates, the plate area required is 1.062 × 10⁻⁵ m² (to 3 significant figures).
The plate separation, d = 4 mm. The capacitance, C = 3 pF = 3 × 10⁻¹² F.
We need to find the plate area, If the material between the plates is air, then the capacitance of a parallel plate capacitor can be given as:
\($$C = \frac{\varepsilon_0A}{d}$$\)
where, ε0 = permittivity of free space = 8.854 × 10⁻¹² F/m.
Substituting the given values in the above formula, we get:
\($$\begin{aligned}C &= \frac{\varepsilon_0A}{d}\\ 3 × 10^{-12} &= \frac{8.854 × 10^{-12} \text{ F/m} × A}{4 × 10^{-3} \text{ m}}\\ A &= \frac{3 × 4 × 10^{-3} \text{ m} × 8.854 × 10^{-12} \text{ F/m}}{8.854 × 10^{-12} \text{ F/m} × 10^{-12}}\\ &= 1.062 × 10^{-5} \text{ m}^2 \end{aligned} $$\)
Therefore, the plate area required to provide a capacitance of 3.00 pF is 1.062 × 10⁻⁵ m² (to three significant figures).
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how long does it take sound to travel the distance between the two microphones? Given.:wave 1 of microphone 1 has T=2 sec and f=1/2Hz and the speed of propagation of the sound is 330m/s
Answers
Answer:
0.00583 seconds
Explanation:
2. A 1,100 kg car comes uniformly to a stop. If the vehicle is accelerating at -1.2 m/s ², which force is closest to the net force acting on the vehicle? (8.6A) *
Answers
Answer:
Since the car comes uniformly to a stop, the force that acts on the vehicle is the net force whose magnitude is equal to 1320 N.
Explanation:
The force acting on the vehicle is given:
\( F = ma \)
Where:
m: is the mass = 1100 kg
a: is the acceleration = -1.2 m/s²
We can find the magnitude of the net force:
\( F = ma = 1100 kg*1.2 m/s^{2} = 1320 N \)
Since the car comes uniformly to a stop, the force that acts on the vehicle is the net force calculated above.
I hope it helps you!
Answer: its d because it said net force meaning the sum of the forces equaling to d
Explanation:
what will be the speed of these waves if we double mm without stretching the wire? what will be the speed of these waves if we double without stretching the wire? 2–√v2v 2v2v vv
Answers
When considering the speed of waves traveling through a stretched wire, there are two key factors at play: tension and mass per unit length. The speed of waves in a stretched wire is determined by the formula v = √(T/μ), where v represents the wave speed, T is the tension in the wire, and μ is the mass per unit length.
If we double the mass per unit length of the wire without changing its tension, we can observe the impact on the wave speed. Doubling the mass per unit length means that the value of μ will increase by a factor of 2. Plugging this into the wave speed formula, we get v' = √(T/(2μ)).
Since the tension (T) remains constant, the only change is in the denominator. When the mass per unit length is doubled, the denominator becomes twice as large, resulting in a decrease in the value inside the square root. As a result, the wave speed (v') will decrease compared to the original wave speed (v).
In conclusion, doubling the mass per unit length of a stretched wire without changing its tension will decrease the speed of the waves traveling through the wire.
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The complete question may be like :
Doubling the mass per unit length of a stretched wire without changing its tension will decrease the speed of the waves traveling through the wire.
It has been a hot summer, so when you arrive at a lake, you decide to go for a swim even though it it nighttime. The water is cold. The next day, you go swimming again during the hottest part of the day, and even though the air is warmer the water is still almost as cold. Why?
(a) Water is fairly dense compared with many other liquids.
(b) Water remains in a liquid state for a wide range of temperatures.
(c) Water has a high bulk modulus.
(d) Water has a high specific heat.
Answers
Answer:
(d) Water has a high specific heat.
Explanation:
At night, when the temperature of earth goes down due to loss of heat , the temperature of water is lost slowly and temperature of land is lost fast because of high specific heat of water . Water loses as well as gains temperature comparatively slowly due to its high specific heat .
During daytime when earth gains heat , the temperature of land rises more rapidly than water so water appears cool even during daytime when land becomes hotter . It is also due to high heat holding capacity of water or due to high specific heat of water .
Voltage ______
Question 1 options:
is measured in Volts
causes current
pushes free electrons around a circuit
all of the choices
Answers
all of the choices.
Explanation:
....
A rock is thrown with an initial velocity of 6 m/s at an angle of 30
degrees. What is the initial velocity of the rock in the x-
direction?
Answers
Answer:
6.9 m/s
Explanation:
Directions: Using the T-chart below, compare balanced forces and unbalanced forces.
Balanced Forces
Unbalanced Forces
(can i please get three examples for each)
Answers
Explanation:
unbalanced: a turning vehicle, apple falling on the ground, kicking a ball
balanced: floating on water, fruit hanging from tree, tug of war equally balanced teams
How do the sperm cells of nonvascular plants reach the egg cells during reproduction?
A.) The sperm cells are forcefully ejected from their capsules to hit the egg cells.
B.) The sperm cells are blown by the wind and land on the egg cells.
C.) The sperm cells swim to the egg cells through their watery surroundings.
Answers
Answer:
C.) The sperm cells swim to the egg cells through their watery surroundings.
A 3.0 g bullet traveling at a speed of 400 m/s enters a tree and exits the other side with a speed of 200 m/s. Where did the bullet's lost KE go, and what was the energy transferred?
Answers
Answer:
1800J
Explanation:
Step one:
given data
mass of bullet m= 3g= 0.03kg
initial velocity u = 400m/s
final velocity v= 200 m/s
Step two:
1.The bullet's lost kinetic energy went inside the tree.
2. The energy transferred is computed as
= initial KE- KE final
Initial KE= 1/2mu^2
Initial KE= 1/2*0.03*400^2
Initial KE= 1/2*0.03*160000
Initial KE= 1/2*4800
Initial KE= 2400J
KE final= 1/2mv^2
KE final= 1/2*0.03*200^2
KE final= 1/2*0.03*40000
KE final= 1/2*1200
KE final= 600J
KE transferred = 2400-600
KE transferred= 1800J
A short horizontal line leads to a small circle, which then has a longer line point up at about 45 degrees. A gap in the horizontal line that led to the circle ends with another small circle and then a short horizontal line segment. In a circuit diagram, what does this symbol represent? a resistor a light bulb a battery a switch. and the answer is D!!!!!!
Answers
Answer:
the answer is D
Explanation:
Answer:
The answer is D
Explanation:
yes
What is the proper banking angle for an Olympic bobsled to negotiate a 100-m radius turn at 35 m/s without skidding
Answers
The proper banking angle for the Olympic bobsled to negotiate a 100 m radius turn at 35 m/s without skidding is approximately 38.7 degrees.
To determine the proper banking angle for an Olympic bobsled to negotiate a 100 m radius turn at 35 m/s without skidding, we can use the concept of centripetal force.
The centripetal force required to keep the bobsled moving in a circular path without skidding is provided by the friction between the bobsled and the track. This force is given by:
Friction force = (mass of the bobsled) * (centripetal acceleration)
Centripetal acceleration is given by:
Centripetal acceleration = (velocity²) / (radius)
In this case, the velocity of the bobsled is 35 m/s, and the radius of the turn is 100 m. Therefore:
Centripetal acceleration = (35²) / 100 = 12.25 m/s²
To calculate the banking angle, we need to consider the gravitational force acting on the bobsled. The vertical component of the gravitational force provides the necessary normal force to balance the vertical component of the friction force. This vertical component is given by:
Vertical component of friction force = (friction force) * cos(banking angle)
The gravitational force is given by:
Gravitational force = (mass of the bobsled) * (acceleration due to gravity)
The vertical component of the gravitational force is given by:
Vertical component of gravitational force = (gravitational force) * sin(banking angle)
To prevent skidding, the vertical component of the gravitational force must balance the vertical component of the friction force:
Vertical component of gravitational force = Vertical component of friction force
(mass of the bobsled) * (acceleration due to gravity) * sin(banking angle) = (friction force) * cos(banking angle)
Substituting the equations for friction force and centripetal acceleration:
(mass of the bobsled) * (acceleration due to gravity) * sin(banking angle) = (mass of the bobsled) * (centripetal acceleration) * cos(banking angle)
The mass of the bobsled cancels out:
(acceleration due to gravity) * sin(banking angle) = (centripetal acceleration) * cos(banking angle)
Substituting the values:
9.8 m/s² * sin(banking angle) = 12.25 m/s² * cos(banking angle)
Dividing both sides by cos(banking angle):
tan(banking angle) = (9.8 m/s²) / (12.25 m/s²)
banking angle = arctan(0.8)
banking angle ≈ 38.7 degrees
Therefore, the Olympic bobsled needs to bank at an appropriate angle of about 38.7 degrees in order to make a turn with a 100 m radius and go at 35 m/s without skidding.
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What is the accuracy of the model?.
Answers
The ratio of the total number of predictions made to the number of classifications a model correctly predicts is known as model accuracy.
It's one method of evaluating a model's performance, but by no means the only one. Accuracy offers the best insight into how well a model is performing on a particular dataset when taking into account a large number of rich measurements at once rather than any one of them individually.In many cases, a model's accuracy needs to be improved because the first pass at training it was insufficient. This is typical in machine learning; some iteration on your initial models is required because it is nearly impossible to create a model that perfectly fits all the goals you initially set out to achieve on your first try.Demerits of model accuracy :- In addition, accuracy could be increased by switching to a totally different model. Convolutional neural networks are one of the top models for classifying images, for instance, as is now widely acknowledged. One could switch to a completely different model, such as the convolutional neural network, for more accurate readings if one had started out on an image classification problem with a simple logistic regression over pixel values in the image and wasn't getting the hoped for performance.To know more about Convolutional neural networks -
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An 4-kg ball experiences a force and accelerates at a rate of 1.5 m/s.
What is the strength of this force?
Answers
Answer:
6.0 N
Explanation:
The strength of a force is expressed as the magnitude of the force in Newton.
The formula to apply here is :
Force= mass * acceleration
F=ma
Mass, m = 4 kg
Acceleration = 1.5 m/s²
Force= 4 *1.5 = 6.0 N
3.) ___ C2H2 + __ H2 → __ C2H6
how is this balanced?
Answers
1 C2H2 + 2H2= C2H6
H2+H2+H2=H6
you already have C2
A transformer has 1000 turns on the primary coil.
The voltage applied to the primary coil is 230V a.c,
How many turns are on the secondary coil if the output
voltage is 46 V a.c.?
A)20 B)200 C)2000 D4000 E)8000
Answers
Answer:
200
Explanation:
Given parameters:
Number of turns in primary coil = 1000 turns
Primary voltage = 230V
Secondary voltage = 46V
Unknown:
Number of turns in secondary coil = ?
Solution:
To solve this problem, we have to use the expression for solving problems related with transformers;
\(\frac{Vs}{Ns}\) = \(\frac{Vp}{Np}\)
Vs is the secondary voltage
Ns is the number of secondary turns
Vp is the primary voltage
Np is the number of primary turns
Now insert the parameters and solve;
\(\frac{46}{Ns}\) = \(\frac{230}{1000}\)
46 x 1000 = 230Ns
Ns = 200
What is the maximum instantaneous power dissipated by a 2.5 −hp pump connected to a 240−Vrms ac power source?
What is the maximum current passing through the pump?
Answers
The maximum current passing through the pump is approximately 11 amperes.
To find the maximum instantaneous power dissipated by a 2.5-hp pump connected to a 240-Vrms AC power source, follow these steps:
1. Convert the horsepower (hp) to watts (W): 1 hp is equal to 746 watts, so 2.5 hp × 746 W/hp = 1865 W.
2. Determine the maximum power: For an AC power source, the maximum power is √2 times the RMS power. So, the maximum power = 1865 W × √2 ≈ 2637.4 W.
The maximum instantaneous power dissipated by the pump is approximately 2637.4 watts.
To find the maximum current passing through the pump:
1. Use the formula: Power (P) = Voltage (V) × Current (I).
2. Rearrange the formula to solve for current: I = P / V.
3. Calculate the maximum current: I = 2637.4 W / 240 V ≈ 11 A.
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A satellite orbiting the earth is directly over a point on the equator at 12:00 midnight every two days. It is not over that point at any time in between. What is the radius of the satellite's orbit?
Answers
The radius of the satellite's orbit is approximately 3039 kilometers.
The time taken for one complete orbit is the period of the satellite's orbit. In this case, the period is two days or 48 hours.
The formula for the period of a satellite's orbit is:
T = 2π√(r³/GM)
Where:
T is the period of the orbit
r is the radius of the orbit
G is the gravitational constant (approximately 6.674 × 10^-11 m³/(kg·s²))
M is the mass of the Earth (approximately 5.972 × 10^24 kg)
In this case:
T = 48 hours = 48 × 3600 seconds (converting to seconds)
G = 6.674 × 10^-11 m³/(kg·s²)
M = 5.972 × 10^24 kg
Substituting the values into the formula, we have:
48 × 3600 = 2π√(r³ / (6.674 × 10^-11 × 5.972 × 10^24))
172,800 = 2π√(r³ / (6.674 × 5.972))
27,600 = √(r³ / (6.674 × 5.972))
r³ / (6.674 × 5.972) = (27,600)²
r³ = (27,600)² × (6.674 × 5.972)
Taking the cube root of both sides to solve for r, we get:
r ≈ ∛((27,600)² × (6.674 × 5.972))
r ≈ ∛(762,048,000 × 39.784)
r ≈ ∛(30,412,577,920)
r ≈ 3039 km (approximately)
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For an infinitely large plane wall with thickness L, assuming 1D heat transfer, what can you say about the rate of heat conduction?
A. It is a constant everywhere.
B. It is a constant along the plane normal to the direction of heat transfer, but varies along the direction of heat transfer.
C. It varies in time.
D. None of the above.
Answers
None of the given option is correct about the rate of heat transfer through an infinitely large plane wall of length L.
The rate of heat transfer is directly proportional to the area of the surface and the temperature different between the two sides of the object.
Q/t = -KAdT/dx
Here K is the constant depends upon the type of material, A is the area of surface, and dT/dx is the temperature gradient. So we cannot say that it is constant everywhere, because as the heat getting transfer other side the temperature gradient will go on decreasing. In addition to this it is not constant along the plane. Also it does not varies with time. So option D is correct.
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frozen preparations (ice cream, sorbet, gelato, granite) can be melted and re-frozen? which cannot be melted and re-frozen? why?
Answers
Frozen preparations such as ice cream, sorbet, gelato, granite can be melted and refrozen, except gelato which cannot be melted and refrozen. This is because the ice cream, sorbet, and granite all contain a high content of fat which allows them to melt and refreeze successfully without becoming damaged.
However, the process of freezing the gelato forms tiny ice crystals, which provide its unique texture. If gelato is melted, it will lose its texture and will not re-freeze successfully.A gelato is a dense Italian ice cream that has a creamy texture and has a lower fat content than traditional ice cream. It is made by mixing milk, sugar, and flavorings, such as nuts or chocolate, and then churned to incorporate air into the mixture.
So, the ice cream, sorbet, and granite all contain a high content of fat which allows them to melt and refreeze successfully without becoming damaged.
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Explain a principal of moments of a force
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The principle of moments states that when a body is balanced the total clockwise moment about a point equals the total anticlockwise moment about the same point.Equation.Moment=Force F×perpendicular distance from the pivot do.