Energy that is transfered between a system and its surrounds due to a difference in temperature is called __

The first law of thermodynamics, also known as the Law of Conservation of Energy, states that energy cannot be created or destroyed, but rather, energy can be converted from one form to another.

This law is based on the idea that energy is a conserved property of the universe, meaning that although it can transform from one form to another, it cannot become “lost” or “destroyed” but instead continues to exist. For example, when a car moves forward, the energy from the engine will transform into kinetic energy and will dissipate as heat, sound, or other forms of energy, but will not be lost.

This conserved energy is used in all matter and all energy processes, making it one of the most fundamental and essential laws of thermodynamics.

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Answer:

The efficiency of the Bluetooth speaker is 62.13 %.

Explanation:

Given;

input electrical energy of the Bluetooth speaker, = 573 J

output sound energy of the Bluetooth speaker, = 356 J

The efficiency of the Bluetooth speaker in transforming electrical energy into sound energy is given by;

\(Efficiency = \frac{0utput\ Energy}{1nput \ Energy} *100\% \\\\Efficiency = \frac{356}{573}*100 \% \\\\Efficiency = 62.13 \ \%\)

Therefore, the efficiency of the Bluetooth speaker is 62.13 %.

(a) A = B × r is a vector potential for B, where r = {x, y, 0}.

(b) The flux through a surface S can be calculated as Φ = ∫B·dA, where B is the magnetic field and dA is an infinitesimal area vector perpendicular to the surface.

(a) To verify that A = B × r is a vector potential for B, we need to show that ∇ × A = B.

Using the cross product property, we have ∇ × A = ∇ × (B × r). Applying the vector identity (A × B) × C = B(A · C) - C(A · B), we get ∇ × (B × r) = B(∇ · r) - r(∇ · B).

Since ∇ · r = 0 (as r = {x, y, 0}), and ∇ · B = 0 (as B has a constant magnitude in the z-direction), we find that ∇ × A = B, verifying A = B × r as the vector potential for B.

(b) The flux through a surface S can be calculated as Φ = ∫B·dA, where B is the magnetic field and dA is an infinitesimal area vector perpendicular to the surface.

Given that B has a constant strength b teslas in the z-direction, the flux through surface S will be Φ = ∫B·dA = ∫(0, 0, b) · (dxdy) = b∫dxdy = bA, where A is the area of the surface S.

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Answer:

B) Take in oxygen needed for survival

Explanation:

Even though fish can live their lives underwater, they still need oxygen to “breathe”

Answer: Work is done when a spring is extended or compressed . Elastic potential energy is stored in the spring. The elastic potential energy stored can be calculated using the equation: elastic potential energy = 0.5 × spring constant × (extension) 2.

Explanation: can you please mark me as brainliest

Answer:

B. is the closest answer.

Explanation:

"Asteroids are leftovers from the formation of our solar system about 4.6 billion years ago."

Answer B. is the closest answer to presenting a proper formation process of Asteroids.

Sorry if wrong....

B. They formed when the solar system formed in a method similar to planets, but they never grew large enough to become planets.

Asteroids:

Any of the thousands of small bodies of from 480 miles (775 km) to less than one mile (1.6 km) in diameter that revolve around the sun in orbits lying mostly between those of Mars and Jupiter.

Answer:

5.94m/s

Explanation:

Using the law of conservation of momentum;

mAuA+ mBuB = mAvA+mBvB

Substitute the given values

1.4(3.7) + 0.55(0) = 1.4(2.3) + 0.55vB

5.18 + 0 = 3.22 + 0.55vB

5.18 - 3.22 = 0.55vB

1.96 = 0.33vB

vB = 1.96/0.33

vB = 5.94m/s

Hence the velocity of Ball B be after the collision is 5.94m/s

The kinetic energy of an object that has a mass of 50.0 kg and a velocity of 18m/s is 8,100J.

Kinetic energy refers to the energy of a body due to its motion. The kinetic energy can be calculated as follows:

K.E = ½ m × v²

Where;

According to this question, an object that has a mass of 50.0 kg and a velocity of 18m/s. The kinetic energy can be calculated as follows:

K.E = ½ × 50 × 18²

K.E = ½ × 16,200

K.E = 8100J.

Therefore, the kinetic energy of an object that has a mass of 50.0 kg and a velocity of 18m/s is 8,100J.

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Answer:

C. affects

Explanation:

affect means to impact or change. When the system fails it's it impacts or affects the others systems so they become sick.

The nonrenewable energy source with the lowest net energy yield is b. nuclear.

Nonrenewable energy sources are resources that cannot be replenished in a short amount of time, and they will eventually run out as we continue to use them. Examples of nonrenewable energy sources include fossil fuels (coal, oil, and natural gas) and nuclear energy. Net energy yield refers to the difference between the energy output of a source and the energy input required for its production, processing, and distribution.

Among the options provided, nuclear energy has the lowest net energy yield. Although nuclear energy is a powerful source of energy, the processes involved in extracting, processing, and managing the waste produced by nuclear power plants require a significant amount of energy input. In comparison to other nonrenewable energy sources such as oil and natural gas, nuclear energy has a lower net energy yield due to the extensive resources required to maintain and operate nuclear power plants safely.

In summary, the nonrenewable energy source with the lowest net energy yield is nuclear energy, as it requires considerable energy input for extraction, processing, and waste management. This results in a lower net energy yield compared to other nonrenewable sources like oil and natural gas.

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The negative symbol denotes that the net force acting on particle q1 is to the left. The solution is -0.74 N, which points to the left.

To find the net force on particle q₁, calculate the force exerted on it by each of the other particles and then add them up vectorially.

The force exerted by particle q₂ on particle q₁ is given by Coulomb's law:

F₁₂ = (kq₁q₂)/r₁₂²

where k = Coulomb's constant, q₁ and q₂ = charges on particles q₁ and q₂ respectively, and r₁₂ = distance between them.

Substituting the given values:

F₁₂ = (910⁹ Nm²/C²)(-8.9910⁻⁶ C)(5.16 x 10⁻⁶ C)/(0.220 m)²

F₁₂ = -1.32 N

The negative sign indicates that the force is attractive, and so it points towards particle q₂.

Similarly, the force exerted by particle q₃ on particle q₁ is given by:

F₁₃ = (kq₁q₃)/r₁₃²

Substituting the given values:

F₁₃ = (910⁹ Nm²/C²)(-8.9910⁻⁶ C)(-89.9 x 10⁻⁶ C)/(0.330 m)²

F₁₃ = 0.577 N

The positive sign indicates that the force is repulsive, and so it points away from particle q₃.

To find the net force on particle q₁, add up the individual forces vectorially:

F_net = F₁₂ + F₁₃

F_net = (-1.32 N) + (0.577 N)

F_net = -0.74 N

The negative sign indicates that the net force on particle q₁ is to the left. Therefore, the answer is -0.74 N, pointing towards the left.

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Given that Radius of the disc, r = 20 cm = 0.2 m Mass of the disc, m = 20 kgAngular acceleration, α = 4 rad/s²

We are to find the torque required to create this angular acceleration.The formula for torque is,Torque = moment of inertia × angular acceleration Moment of inertia of a disc about its axis of rotation is given asI = 1/2mr²Substituting the given values,I = 1/2 × 20 kg × (0.2 m)² = 0.4 kg m²Therefore,Torque = moment of inertia × angular acceleration= 0.4 kg m² × 4 rad/s²= 1.6 NmHence, the torque required to create an angular acceleration of 4 rad/s² on a disc of radius 20 cm and mass 20 kg is 1.6 Nm.

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a: acceleration

Δv: change in velocity

t: time

a = Δv/t = (21-39)/8 = -18/8 m/s^2 = -2.25 m/s^2

Answer:

\(5\; {\rm m\cdot s^{-1}}\).

Explanation:

Displacement is the change in position. In this example, the position of this ball changed from the initial value of \(x_{0} = (-5)\; {\rm m}\) to the final value \(x_{1} = 0\; {\rm m}\). Subtract the initial position from the final position to find the change in position:

\(\begin{aligned} & (\text{Displacement}) \\ =\; & (\text{Change in Position}) \\ =\; & (\text{Final Position}) - (\text{Initial Position}) \\ =\; & 0\; {\rm m} - (-5)\; {\rm m} \\ =\; & 5\; {\rm m} \end{aligned}\).

Velocity is the rate of change in position. To find average velocity (average rate of change in position), divide the total change in position (displacement) by the time required for the change:

\(\begin{aligned} & (\text{Average Velocity}) \\ =\; & \frac{(\text{Total Change in Position})}{(\text{Time Required})} \\ =\; & \frac{(\text{Displacement})}{(\text{Time Required})}\\ =\; & \frac{5\; {\rm m}}{1\; {\rm s}} \\ =\; & 5\; {\rm m\cdot s^{-1}} \end{aligned}\).

Therefore, the average velocity will be \(5\; {\rm m\cdot s^{-1}}\).

Answer:

E

Explanation:

The frequency of a simple harmonic oscillator with an amplitude of 4.0 cm and passing through its equilibrium position once every 0.50 seconds is 2.0 Hz.

A simple harmonic oscillator is a system that exhibits periodic motion where the restoring force is directly proportional to the displacement from equilibrium. In this scenario, we are given the amplitude and the time period of the oscillator. The time period, which is the time taken for one complete oscillation, can be used to calculate the frequency of the oscillator. The frequency of an oscillator is the number of oscillations it completes in one second and is calculated by taking the reciprocal of the time period. Therefore, the frequency of this oscillator is 1/0.50 seconds, which is equal to 2.0 Hz.

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This question involves the concepts of tension force and centripetal force.

The tension force in the rope is "3.4 N".

In this scenario, the centripetal force shall be acting as the tension force of the rope. Because in order for the puck to move in a circular path, the tension force in the rope must be equal to the centripetal force.

\(Tension\ Force = Centripetal\ Force\\F = \frac{mv^2}{r}\)

where,

F = tension force = ?

m = mass of puck = 170 g = 0.17 kg

r = radius of path = length of rope = 65 cm = 0.65 m

v = linear speed of puck = r(angular speed) = (0.65 m)(53 rpm)\((\frac{2\pi\ rad}{1\ rev})(\frac{1\ min}{60\ s})\)

v = 3.61 m/s

Therefore,

\(F = \frac{(0.17\ kg)(3.61\ m/s)^2}{0.65\ m}\)

F = 3.4 N

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The attached picture shows the centripetal force.

We are asked to determine the net rate of radiation of a roof given its area and its emisivity. To do that we will use the following formula:

Where:

The Stefan-Boltzmann's constant is given by:

Now, we need to convert the temperature to Kelvin. To do that we use the following:

Where:

For the 33°C we have:

For the 14°C:

Now, we substitute the values:

Solving the operation:

Therefore, the net rate of radiation is -27870.84 Watts.

Answer: In the Newton's ring experiment, the diameter of the 4th dark ring is 0.30 cm and the diameter of the 10th dark ring is 0.62 cm. We can use this information to find the diameter of the 15th dark ring and calculate the wavelength of the light.

Explanation:

In the Newton's ring experiment, the diameter of the 4th dark ring is 0.30 cm and the diameter of the 10th dark ring is 0.62 cm. We can use this information to find the diameter of the 15th dark ring and calculate the wavelength of the light.

a) To find the diameter of the 15th dark ring, we can use the formula for the diameter of the nth dark ring:

d_n = sqrt(n * λ * R)

where d_n is the diameter of the nth dark ring, n is the order of the ring, λ is the wavelength of the light, and R is the radius of curvature of the lens.

Since we want to find the diameter of the 15th dark ring, we can substitute n = 15 into the formula and solve for d_15:

d_15 = sqrt(15 * λ * R)

b) To calculate the wavelength of the light, we can use the formula:

λ = (\(d_10^2 - d_4^2\)) / (\(10^2 - 4^2\))

where d_10 is the diameter of the 10th dark ring and d_4 is the diameter of the 4th dark ring.

Substituting the given values, we have:

λ = (\(0.62^2 - 0.30^2\)) / (\(10^2 - 4^2\))

Simplifying this expression will give us the value of the wavelength of the light used in the experiment.

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Answer:

Hey Friend....

Explanation:

This is ur answer....

Hope it helps!

Brainliest pls!

Follow me! :)

Answer:

. living things only have energy : true.

Answer:

F

Explanation:

Example, sun, nuclear, etc

According to frictional force, the normal force is 3782.61 N.

We need to know about frictional force to solve this problem. The frictional force is the force against the object to move. The magnitude of the frictional force can be determined as

Ff = N . μ

where Ff is the frictional force, N is normal force and μ is coefficient of friction

From the question above, we know that

Ff = 870 N

μ = 0.23

By substituting the given parameters, we can determine the normal force

Ff = N . μ

870 = N . 0.23

N = 870 / 0.23

N = 3782.61 N

Hence, the normal force is 3782.61 N.

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Answer:

1000 x 30 squared x 1/2 = 450000

Explanation:

1000 x 30 squared x 1/2 = 450000

Answer:

You should use the evaporative cooler

Explanation:

Because its not fast but will help you remover around the tracks.

Stopping from 55 mph requires the most work done by the brakes of a car.

Hence, the correct option is B.

When a car slows down or comes to a complete stop, the work done by the brakes is directly related to the change in kinetic energy of the car. The kinetic energy of an object is given by the equation:

Kinetic energy = (1/2) * mass * \(velocity^2\)

Comparing the options:

A. Slowing down from 80 mph to 55 mph: In this case, the car is experiencing a decrease in velocity, resulting in a decrease in kinetic energy. However, the change in kinetic energy is less compared to option B.

B. Stopping from 55 mph: In this case, the car comes to a complete stop, resulting in a significant decrease in velocity and a substantial change in kinetic energy. The brakes need to dissipate the entire kinetic energy of the car, requiring the most work.

C. Equal amounts of work for both: This option is incorrect. Slowing down from a higher speed to a lower speed (option A) requires less work than coming to a complete stop (option B). The work done by the brakes is directly proportional to the change in kinetic energy, and stopping from a higher speed involves a greater change in kinetic energy.

Therefore, Stopping from 55 mph requires the most work done by the brakes of a car.

Hence, the correct option is B.

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The machine's efficiency is 81.61%, indicating that it converts 81.61% of the input energy into useful output energy, while the remaining percentage is lost as waste or dissipated in the process.

To calculate the efficiency, we can use the formula:

Efficiency = (Actual Output / Design Capacity) × 100

Given:

Actual Output = 7,407

Design Capacity = 9,050

Substituting the values into the formula:

Efficiency = (7,407 / 9,050) × 100

          = 0.817 × 100

          = 81.61%

Therefore, the efficiency of the machine is 81.61%.

Efficiency is a measure of how effectively a machine or system is utilizing its available capacity. In this case, the machine has a design capacity of 9,050 units, but it only produced an actual output of 7,407 units.

By dividing the actual output by the design capacity and multiplying by 100, we find that the machine's efficiency is 81.61%. This indicates that the machine is operating at approximately 81.61% of its full capacity.

A higher efficiency percentage would indicate a more optimal utilization of the machine's capacity, while a lower percentage suggests room for improvement in maximizing output.

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