The size of the difference threshold is greater for heavier objects than for lighter ones. This best illustrates.

The estimated maximum power output of the heat engine using hot springs with a groundwater temperature of 95 °C and a mass flux of 0.2 kg/s is approximately 0.0128 kW.

To estimate the maximum power output of the heat engine using hot springs, we can utilize the concept of the Carnot cycle, which provides an upper limit for the efficiency of a heat engine.

The Carnot efficiency is given by the formula:

η = 1 - (Tc/Th)

Where η is the efficiency, Tc is the temperature of the cold reservoir (ambient temperature), and Th is the temperature of the hot reservoir (groundwater temperature).

Given:

Tc = 20 °C = 293 K

Th = 95 °C = 368 K

The maximum power output can be calculated using the formula:

P = η * Q

Where P is the power output and Q is the heat transfer rate.

The heat transfer rate can be calculated using the formula:

Q = m * Cp * (Th - Tc)

Given:

m = 0.2 kg/s (mass flux)

Cp = specific heat capacity of water ≈ 4.18 kJ/kg°C

Let's calculate the maximum power output:

Tc = 293 K

Th = 368 K

m = 0.2 kg/s

Cp = 4.18 kJ/kg°C = 4.18 J/g°C = 4.18 * 10⁻³ J/kg°C

Q = m * Cp * (Th - Tc)

  = 0.2 kg/s * 4.18 * 10⁻³ J/kg°C * (368 K - 293 K)

  = 0.2 * 4.18 * 10⁻³ * 75

  = 0.0627 kW

η = 1 - (Tc/Th)

  = 1 - (293/368)

  ≈ 0.204

P = η * Q

  = 0.204 * 0.0627 kW

  ≈ 0.0128 kW

Therefore, the estimated maximum power output of the heat engine using hot springs with a groundwater temperature of 95 °C and a mass flux of 0.2 kg/s is approximately 0.0128 kW.

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Answer:

C. Equal to 0

Explanation:

voltage is only produced when the magnet is in motion. Hope this helps :)

i) The material with high relative permittivity would be suitable for high frequency applications because it can effectively store electric energy in the presence of an electric field.

ii) One metal is copper because it has low resistivity, allowing for efficient conduction of electric current.

iii) The material with high initial relative permeability will give the highest magnetic flux for the smallest magnetic intensity increment.

i) High-frequency applications require materials that can effectively store electric energy in the presence of an electric field. This is achieved by using materials with high relative permittivity. High relative permittivity allows for increased energy storage in the material, making it suitable for high-frequency applications where efficient energy transfer is required.

ii) Copper is widely used as a metal in various applications due to its low resistivity. Low resistivity means that copper can conduct electric current with minimal loss of energy. It offers excellent electrical conductivity, making it a favorable choice for conducting electricity in many industries.

iii) The material with high initial relative permeability will provide the highest magnetic flux for the smallest magnetic intensity increment. Relative permeability is a measure of how easily a material can be magnetized.

A higher initial relative permeability indicates that the material can be easily magnetized, resulting in a larger magnetic flux for a smaller change in magnetic intensity. This property is desirable when maximizing magnetic flux is important, such as in magnetic applications where high efficiency or strong magnetic fields are desired.

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Complete Question:

Initial Relative Permability Resistivity Low Low High High C Low High table According to the information i) which material would use for high frequency applications? you Why? (1 sentence) ii) which is one metal? why? (1 sentence) a iii) which one will give highest magnetic flux for smallest magnetic intensity increament?

The given problem involves a mild steel bar placed inside a hollow aluminum cylinder. Both the bar and cylinder have the same length but different diameters. When an axial compressive load of 1000 N is applied to the composite bar, it contracts by the same amount. To solve the problem, we need to calculate the stress in each material. Additionally, we are asked to determine the final stress in the bar and cylinder when the temperature is reduced by 150°C without any change in length.

To calculate the stress in each material, we need to first determine the change in length of the composite bar due to the applied load. Since the bar and cylinder contract by the same amount, the change in length can be determined using the formula:

ΔL = (Load * Length) / (π * (r₁² - r₂²) * E)

Where ΔL is the change in length, Load is the applied compressive load (1000 N), Length is the length of the bar and cylinder, r₁ is the radius of the bar (75 mm / 2 = 37.5 mm), r₂ is the radius of the cylinder (100 mm / 2 = 50 mm), and E is the Young's modulus of the material.

For mild steel:

ΔL₁ = (1000 * Length) / (π * (37.5² - 0²) * 200,000)

For aluminum:

ΔL₂ = (1000 * Length) / (π * (50² - 37.5²) * 100,000)

Next, we need to calculate the change in length due to the temperature reduction. The change in length can be calculated using the formula:

ΔL = (Length * ΔT * α)

Where ΔL is the change in length, Length is the initial length of the bar and cylinder, ΔT is the change in temperature (-150°C), and α is the coefficient of linear expansion.

For mild steel:

ΔL₁ = Length * (-150) * 0.0000012

For aluminum:

ΔL₂ = Length * (-150) * 0.000005

To calculate the final stress in each material, we use the formula:

Stress = Load / (π * r²)

For mild steel:

Stress₁ = 1000 / (π * (37.5)²)

For aluminum:

Stress₂ = 1000 / (π * (50)²)

[ Please note that the above calculations assume the materials behave linearly and there are no plastic deformations. ]                                                                                                                                                                                                                    

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The MR20DE 4-cylinder engine provides up to 90% of its torque below 2400 rpm for excellent low- and mid-range response in everyday driving.

Torque is the rotational force produced by an engine that enables it to perform work. In the case of the MR20DE 4-cylinder engine, it is stated that up to 90% of its torque is available below 2400 rpm.

The given statement highlights the engine's performance characteristics in the low- and mid-range rpm range, which are typically encountered during everyday driving. It indicates that the engine delivers a significant portion of its maximum torque output at these lower engine speeds.

This attribute is desirable for everyday driving situations as it ensures responsive acceleration and adequate power delivery, especially during start-up and while cruising at lower speeds.

By providing a substantial amount of torque at lower rpm, the MR20DE engine can effectively meet the demands of typical driving scenarios, offering good acceleration and responsiveness without the need for high engine revs. This characteristic contributes to a smooth and efficient driving experience in everyday situations.

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Answer:

Charge is 9.6 Coulombs

Explanation:

- From definition of current, current is rate of flow of charge in a circuit

\(current = \triangle(charge) \\ \\ current = \frac{charge}{time} \\ \\ { \boxed{ I = \frac{Q}{t} }}\)

- From the question above,

\(0.08 = \frac{Q}{120} \\ \\ Q = 120 \times 0.08 \\ \\ Q = 9.6 \: C\)

Let's denote the horizontal distance between the child and the kite by x, and the length of the string by y. We can use the Pythagorean theorem to relate x and y:

\(x^{2}\)+ \(y^{2}\)= \(50^{2}\)

Differentiating both sides with respect to time t, we get:

2x(dx/dt) + 2y(dy/dt) = 0

We are given that dx/dt = 26 ft/sec. To find dy/dt, we need to know the values of x and y when the kite is 130 feet away from the child.

When the kite is 130 feet away, we can use the Pythagorean theorem to solve for y:

y = √(50² - x²)

Substituting x = 130 into this equation, we get:

y = √(50² - 130²) = 40 ft

Now we can substitute x = 130, y = 40, and dx/dt = 26 into the equation for 2x(dx/dt) + 2y(dy/dt) = 0:

2(130)(26) + 2(40)(dy/dt) = 0

Simplifying this expression, we get:

dy/dt = -845/4 ft/sec

The negative sign indicates that the child needs to pull in the string rather than let it out. Therefore, the child needs to pull in the string at a rate of approximately 211.25 ft/sec when the kite is 130 ft away.

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Answer:

1040 Kilohertz = 1.04E6 /sec

Speed of electromagnetic waves = 3.00E8 m/s

3.00E8 / 1.04E6 = 288 m  (a λ/4 antenna still requires 72 m)

Answer:

The answer is

Explanation:

The velocity or speed of an object can be found by using the formula

\(velocity \: = \frac{distance}{time} \)

From the question

time taken to travel = 10 hours

distance covered = 550 miles

Substitute the values into the above formula and solve for the velocity

That's

\(velocity = \frac{550}{10} \)

We have the final answer as

Hope this helps you

Answer:

636.4 J

Explanation:

The potential energy between one of the charges at the corner of the square and the fifth identical charge is U = kq²/r where q = charge = +50 × 10⁻⁶ C  and r = distance from center of square. = √2 m (since the midpoint of the sides = 1 m, so the distance from the charge at the corner to the center is thus √(1² + 1²) = √2)

Since we have four charges, the additional potential energy to move the charge to the centre of the square is U' = 4U = 4kq²/r

U' = 4kq²/r

= 4 × 9 × 10⁹ Nm²/C² (+50 × 10⁻⁶ C)²/√2 m

= 900 Nm²/√2 m

= 636.4 J

The total external energy required is 636.4 J.

According to the question, a square of side a = 2m has 4 identical charges on the corners with charge Q = 50×10⁻⁶C.

A fifth identical charge is brought at the geometric center of the square. The geometric center is at the center of the diagonal:

\(r=\frac{a}{\sqrt{2} }=\sqrt{2}\;m\)

The potential energy is a state function which means that it depends on the initial and final position.

Now the energy required is equal to the change in potential energy

\(\Delta U=\frac{1}{4\pi\epsilon_o}\frac{4Q^2}{r}\\\\\Delta U=\frac{4\times9\times10^9\times(50\times10^{-6})^2}{\sqrt{2} } \\\\\Delta U=636.4\;J\)

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Answer:

Phones as sunglasses with a mic. I put on my glasses and I say what's the weather today, The sunglasses will tell me the weather and can be charged just like phones

Explanation:

Answer:

The answers is A lol

Explanation:

Take into account that any conversion factor can be written as a fraction in which you have the equivalence in the numerator and denominator.

b. 1 mile = 1.61 kilometer

By using the abbreviated form mi as mile and km as kiometer, you can write:

c. 4 cups = 1 quart

To find the current in the resistor, we can use Ohm's Law and the concept of equivalent resistance. Thus, option A is correct.

First, let's calculate the equivalent resistance of the three cells connected in parallel. When resistors are connected in parallel, the reciprocal of the equivalent resistance is equal to the sum of the reciprocals of the individual resistances:

1/Req = 1/R1 + 1/R2 + 1/R3

Given that R1 = R2 = R3 = 22 Ω (internal resistance of each cell), we can substitute the values:

1/Req = 1/22 + 1/22 + 1/22

1/Req = 3/22

Taking the reciprocal of both sides, we find:

Req = 22/3 Ω

Now we can use Ohm's Law to calculate the current (I) in the resistor. Ohm's Law states that the current flowing through a resistor is equal to the voltage across it divided by its resistance:

I = V/R

Given that V = 1.1 V (emf of each cell) and R = 32 Ω (resistance), we can substitute the values:

I = 1.1/32

Calculating this value, we find:

I ≈ 0.034375 A

Therefore, the current in the resistor is approximately 0.034375 A.

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The duck lands approximately 0.612 m away from the base of the post ,  the horizontal velocity of the system is constant.

Mass of the duck, m₁ = 3 kg

Height of the post, h = 2.5 m

Mass of the bullet, m₂ = 3.8 g = 0.0038 kg

Velocity of the bullet, v = 400 m/s

In order to find the horizontal distance that the duck travels before landing, we first need to find the time taken for the duck to fall.Using the equation of motion for vertical motion, we can find the time taken for the duck to fall from the post to the ground.

Let u be the initial velocity (zero), and g be the acceleration due to gravity (9.8 m/s²).

h = ut + 0.5gt²2.5

= 0 + 0.5 × 9.8 × t²t

= √(2.5/4.9)

≈ 0.51 s

So the duck takes 0.51 s to fall from the post to the ground.Now, using the conservation of momentum, we can find the velocity of the combined system (duck + bullet) after the collision.

We can assume that the horizontal velocity of the system remains constant before and after the collision.

m₁u₁ + m₂u₂ = (m₁ + m₂)v

Where u₁ and u₂ are the initial velocities of the duck and bullet respectively, and v is the velocity of the combined system after the collision.

Since the duck is at rest before the collision, u₁ = 0.

So we have: 0 + 0.0038 × 400

= (3 + 0.0038) × vv

= 1.20 m/s

Therefore, the combined system moves at a velocity of 1.20 m/s after the collision.Now we can use the horizontal velocity of the combined system to find the horizontal distance that the duck travels before landing.

We can assume that there is no air resistance and that the horizontal velocity of the system is constant.

Therefore, the horizontal distance traveled is:

d = vt

= 1.20 × 0.51

≈ 0.612 m

So the duck lands approximately 0.612 m away from the base of the post.

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a. Contact forces, friction, air resistance

To find the net resultant force, we need to break down each force into its horizontal and vertical components. The net resultant force is approximately 32.83 N at an angle of 32.79 degrees with the x-axis.

For the first force of 25 N at an angle of 20 degrees with the x-axis:

The horizontal component is:

25 N * cos(20) ≈ 23.76 N

The vertical component is:

25 N * sin(20) ≈ 8.56 N

For the second force of 10 N at an angle of 60 degrees with the x-axis:

The horizontal component is:

10 N * cos(60) = 5 N

The vertical component is:

10 N * sin(60) = 8.66 N

The net horizontal force is the sum of the horizontal components of each force:

23.76 N + 5 N = 28.76 N

The net vertical force is the sum of the vertical components of each force:

8.56 N + 8.66 N ≈ 17.22 N

To find the magnitude and direction of the net resultant force, we can use the Pythagorean theorem and trigonometry:

The magnitude of the net resultant force is:

√((28.76 N)² + (17.22 N)²) = 32.83 N

The direction of the net resultant force is:

tan⁻¹ (17.22 N / 28.76 N) = 32.79 degrees with the x-axis

Therefore, the net resultant force is approximately 32.83 N at an angle of 32.79 degrees with the x-axis.

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Answer:

Explanation:

Answer:

Earth receives the perfect amount of heat and light that allow life to flourish

Covalent solids exhibit low melting points and boiling points. Therefore, option B is correct.

In a covalent compound, the covalent bond is formed by the mutual sharing of electrons that can hold all molecules together. Shared electron pairs are difficult to give away as nuclei of two elements together share the electrons therefore these types of bonds are stronger.

A covalent network solid can be described as a chemical compound in which the atoms are bonded by covalent bonds in a continuous network. The covalent solids are generally brittle in nature.

The melting points for covalent solids are generally low while high melting points for ionic solids.

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The shock wave velocity, W, is approximately 347.2 m/s (Option C).

In a normal shock wave, the pressure ratio across the shock, P₂/P₁, is related to the shock wave velocity, W, by the equation:

(P₂/P₁) = 1 + ((γ - 1) / 2) * (M₁² / γM₁² - 1),

where γ is the ratio of specific heats and M1 is the Mach number before the shock.

Given that the pressure ratio across the shock is 9, we can solve the equation to find the Mach number before the shock. Using the specific heat ratio for air (γ = 1.4), we find that the Mach number before the shock, M1, is approximately 3.

The shock wave velocity, W, is then calculated using the equation:

W = M1 * √(γRT1),

where R is the gas constant and T₁ is the ambient temperature. Substituting the values, we find that the shock wave velocity is approximately 347.2 m/s. Therefore, the correct option is C.

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Answer:

the answer is 600/5 km/h

The answers include the following:

This is referred to as a barrier which restricts the flow of surface water and has different importance which include the generation of electricity through the wind turbines.

The dam uses the water current to move the turbines and there are some advantages which should be considered before it is constructed such as the control of flood and as a source of water supply.

Disadvantages such as local ecosystem disruption should also be considered so as to protect species and ensure that they don't go extinct.

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The color of light that gets through red glass is red.

When light passes through a red glass, it absorbs all other colors except for red. This is because red glass contains pigments that selectively absorb light of different colors. The molecules in the pigments absorb the energy of the incoming light, and then re-emit it as a different color.

So, when white light is shone on a red glass, all colors except red are absorbed, and only red light is transmitted through the glass. This is why we see objects through a red glass with a red tint. Elementary school kids learn about colors and light in science classes, so it's possible that they may be familiar with the properties of red glass and how it filters light.

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Combination unit is an air conditioner that contains components for cooling and heating in one sheet metal cabinet. this is true statement.

Heating and cooling are often taken for granted by most people. In the winter and summer, we'll count on the heating and air conditioning to keep us comfortable. You may be able to save money and have a more comfortable environment with a single system that controls both. We may offer combination heating and air conditioning units at Climate Environmental, which will comprise air conditioning systems and heating units that will supply both warm air and cold air with the touch of a remote control.

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Answer:

It would take 8.22037 hrs away. Wouldn't it?

Explanation:

Because

    4.11016

    4.11016

            15

= 8.22037

Explanation:

Choose a small section of the book to measure. This section should be near the spine of the book, where the pages are tightly bound together.

Hold the ruler perpendicular to the book's spine, so that it is parallel to the pages you want to measure.Carefully close the book so that the pages you want to measure are sandwiched between the ruler and the spine.

Read the measurement on the ruler where the top and bottom of the pages meet. This measurement represents the thickness of the entire stack of pages.

Estimate the number of pages in the stack by dividing the height of the stack by the measurement you just took. For example, if the stack is 2 centimeters high and the measurement you took is 0.1 centimeters, then you can estimate that the stack contains approximately 20 pages.

Finally, divide the thickness of the entire stack by the number of pages in the stack to estimate the thickness of one paper. For example, if the stack is 0.1 centimeters thick and contains 20 pages, then the estimated thickness of one paper is 0.005 centimeters or 0.05 millimeters.

Answer:

The final velocity of the ball is 39.2 m/s.

Explanation:

Given that,

A ball is dropped from rest from a high window of a tall building.

Time = 4 sec

We need to calculate the final velocity of the ball

Using equation if motion

\(v=u+gt\)

Where, v = final velocity

u = initial velocity

g = acceleration due to gravity

t = time

Put the value into the formula

\(v=0+9.8\times4\)

\(v=39.2\ m/s\)

Hence, The final velocity of the ball is 39.2 m/s.

Statement that is true about chemical reaction that forms acid rain : b)The bonds that break are between N and O in HNO2and between O and H in HNO3.

Acid rain is a acid deposition, which refers to the many ways in which acidity can move from atmosphere to Earth's surface. Acid deposition includes acidic rain as well as other forms of acidic wet deposition such as snow, sleet, hail, and fog.

HNO2 is less stable thus dissociates easily to HNO3 + NO + H2O and HNO3 is a strong acid. Therefore, when they react with H2O, they form acid rain.

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Note: The question given on the portal is incomplete. Here is the complete question.

Question: Which two statements are true about this chemical reaction that forms acid rain? 2NO2 + H2O--> HNO2 +HNO3

a) The bonds that form are between N and O in HNO2 between and between O and H in HNO3.

b)The bonds that break are between N and O in HNO2and between O and H in HNO3.

c)The bonds that break are between N and O in NO2 and between O and H in H2O.

d)The bonds that form are between N and O in NO2 and between O and H in H2O.

Answer:  The correct two answers are  :  

1.)  The BONDS that FORM are between N and O in HNO  2   and between O and H in HNO 3

2.)  The BONDS that BREAK are between N and O in NO2 and between H and O in H2O

Explanation:   I took the test.