A steam engine (assume a Carnot engine) has an efficiency of 72.8%. If the waste heat has a temperature of 48.3°C, what is the temperature of the boiler? Answer in units of °C.​

Answer:

its also difficult for me.

The characteristics of electromagnetic radiation include amplitude (brightness), wavelength, frequency, and period. We have shown that the frequency of a light wave is proportional to its energy by the equation E = h v or E=hnu

so

Radiation with a wavelength of 8.1 X 10^-8 m has the highest energy

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Answer:

A) Sue is lifting the bucket by a force of 49.035 newtons.

B) The bucket has an acceleration of 8.207 meters per square second on the Moon.

Explanation:

A) According to the First Newton's Law, a system is at equilibrium when it is either at rest or travelling at constant velocity. In this case, Sue must exert an external force on the bucket, whose magnitude is equal to the weight of the bucket but direction is opposed to it. By Second Newton's Law, we find that:

\(\Sigma F = F - m\cdot g = 0\) (1)

Where:

\(F\) - Lifting force, measured in newtons.

\(m\) - Mass of the bucket, measured in kilograms.

\(g\) - Gravitational acceleration, measured in meters per square second.

If we know that \(m = 5\,kg\) and \(g = 9.807\,\frac{m}{s^{2}}\), then the lifting force is:

\(F = m\cdot g\)

\(F = (5\,kg)\cdot \left(9.807\,\frac{m}{s^{2}} \right)\)

\(F = 49.035\,N\)

Sue is lifting the bucket by a force of 49.035 newtons.

B) By the Second Newton's Law, we have the following model:

\(\Sigma F = F-m\cdot g = m\cdot a\) (2)

Where \(a\) is the net acceleration of the bucket, measured in meters per square second.

If we know that \(F = 49.035\,N\), \(m = 5\,kg\) and \(g = 1.6\,\frac{m}{s^{2}}\), then the net acceleration of the bucket is:

\(a = \frac{F}{m} -g\)

\(a = \frac{49.035\,N}{5\,kg}-1.6\,\frac{m}{s^{2}}\)

\(a = 8.207\,\frac{m}{s^{2}}\)

The bucket has an acceleration of 8.207 meters per square second on the Moon.

(a) The force applied by Sue in lifting the bucket at a constant velocity is 49 N.

(b) The acceleration of the bucket when lifted on the moon is 8.2 m/s².

The given parameters;

The force applied by Sue in lifting the bucket at a constant velocity is calculated as;

\(F = m(a + g)\)

\(F= mg\\\\F = 5 \times 9.8\\\\F = 49 \ N\)

The acceleration of the bucket when lifted on the moon with the calculated force is;

\(F = m(a + g)\\\\a+g = \frac{F}{m} \\\\a = \frac{F}{m} - g\\\\a = \frac{49}{5} - 1.6\\\\a = 8.2 \ m/s^2\)

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Answer:

both statements are truth

Explanation:

a-The Joule effect, also called Joule's law, is the thermal manifestation of electrical resistance. ... In all these cases, it is intended to generate thermal energy with electricity passing through its conductors. This heat they give off is due to the Joule effect.

b-sure of a liquid tank depends only on the density of the liquid and depth from the free surface. It is a scalar quantity and is same in all directions, at a point.

The speed of the treadmill changes by 1.34 m/s after 5.6 min.

First we can use the kinematic equation:

v_f = v_i + aΔt

where

First, we need to convert the time interval to seconds:

Δt = 5.6 min × 60 s/min = 336 s

Now we can plug in the values and solve for v_f:

v_f = 0 + (0.0040 m/s^2)(336 s) = 1.34 m/s

Therefore, the speed of the treadmill changes by 1.34 m/s after 5.6 min.

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Answer:

If the bicycle went down the hill, because if you are at the top of the hill, that is potential energy, when you start going down, it is turned into kinetic energy. Makes sense?

Explanation:

The phenomenon bending of a wave as it crosses from one medium to another is said to be refraction. The speeds of light in the water will be 2.25×10⁸ m/sec.

The phenomenon bending of a wave as it crosses from one medium to another is said to be refraction. The difference in density is the cause of the bending.

Refraction is a term that is used to describe the phenomenon of refraction."The change in direction of a wave traveling through one medium to another is known as refraction."

The following data are given in the problem;

C is the Speed of light in a vacuum =3×10⁸ m/sec.

n is an index of refraction for water = 1.333

v is the speed of light in the water=?

The index of refraction is the ratio of the speed of light in a vacuum to the speed of light in water. By the formula of the index of refraction.

\(\rm n=\frac{C}{V} \\\\ \rm V=\frac{C}{n}\\\\ \rm V=\frac{3\times10^8}{1.333}\\\\\ \rm V=225056264.1\;m/sec.\\\\\rm V=2.25\times10^8\;m/sec.\)

Hence the speed of light in the water will be 2.25×10⁸ m/sec.

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The phenomenon bending of a wave as it crosses from one medium to another is said to be refraction. The speeds of light in the water will be 2.25×10⁸ m/sec.

The phenomenon bending of a wave as it crosses from one medium to another is said to be refraction. The difference in density is the cause of the bending.

Refraction is a term that is used to describe the phenomenon of refraction."The change in direction of a wave traveling through one medium to another is known as refraction."

The following data are given in the problem;

C is the Speed of light in a vacuum =3×10⁸ m/sec.

n is an index of refraction for water = 1.333

v is the speed of light in the water=?

The index of refraction is the ratio of the speed of light in a vacuum to the speed of light in water. By the formula of the index of refraction.

\(n=\dfrac{c}{v}\)

\(V=\dfrac{c}{n}\)

\(V=\dfrac{3\times10^8}{1.333}\)

\(V=2.25\times 10^8 m/s\)

Hence the speed of light in the water will be 2.25×10⁸ m/sec.

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a.  communicate the solution

The chi-square test assumes that the variables being analyzed are measured at a nominal or ordinal level of measurement.

In statistics, the level of measurement refers to the nature and properties of the data being collected. There are four levels of measurement: nominal, ordinal, interval, and ratio. Nominal and ordinal levels are considered categorical, while interval and ratio levels are considered numerical. The chi-square test is specifically designed for analyzing categorical data, where the observations can be classified into distinct categories or groups. It is used to determine whether there is a significant association or relationship between two categorical variables.

The test calculates the difference between the observed frequencies and the expected frequencies under the assumption of independence between the variables. It compares the observed and expected frequencies using a chi-square statistic and determines the p-value to assess the statistical significance of the association. Therefore, the chi-square test assumes that the variables being analyzed are measured at a nominal or ordinal level because it deals with categorical data and evaluates the relationship between different categories or groups.

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When discussing Newton's laws of motion, people most likely use the terms "action" and "reaction" when talking about Newton's third law of motion.

Newton's third law of motion states that for every action, there is an equal and opposite reaction. This means that whenever one object exerts a force on another object, the second object exerts an equal and opposite force back on the first object.

In other words, if object A pushes or pulls on object B with a certain force, then object B will push or pull back on object A with an equal and opposite force. This law applies to all types of forces, whether they are contact forces or non-contact forces, such as gravitational or electromagnetic forces.

This law is important in understanding how forces work in the physical world. It helps explain why things don't just keep accelerating indefinitely when a force is applied, and why forces always come in pairs. It also plays a crucial role in understanding the behavior of systems like rockets, airplanes, and cars.

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Answer:

e=75%=0.75 work output = usful work=240j

Explanation:

Answer:

Distance, S = 13m

Explanation:

Given the following data;

Initial velocity, u = 4m/s

Final velocity, v = 9m/s

Time, t = 2 seconds

To find the distance, S;

First of all, we would determine the acceleration of the shark.

Acceleration = (v - u)/t

Acceleration = (9 - 4)/2

Acceleration = 5/2

Acceleration = 2.5m/s²

Now, to find the distance we would use the second equation of motion

S = ut + ½at²

Substituting into the equation, we have

S = 4(2) + ½*2.5*2²

S = 8 + 1.25*4

S = 8 + 5

Distance, S = 13m

Answer:

the answer is c

Explanation:

In the attached figure, north pole of magnet first moved down toward the loop of wire and withdrawn upward then the induced current in the loop is equals to the first clockwise, then counter-clockwise. So, option(d) is right one.

A magnet is a bar magnetic which produces the magnetic field and attract or reple other objects.

North pole of the magnet faces the loop. First it is move up away from the loop. According to Lenz's law, the induced current in the loop is such that it opposes the cause producing it. So, the current will try to pull back the magnet towards it. We knoe opposite pole attract each other, so the pole induced in the loop should be south. We also know that clockwise current produces a south pole and counterclockwise current produces a north pole. Hence the direction of current is clockwise. Then, the magnet is moved down towards the loop. For similar reasons, the loop will try to push it back up. Hence the current is counterclockwise so as to generate north pole.

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Complete question:

The attached figure complete the question.

Answer:

answer is option 2 increasing the resistance /output distance

To calculate the distance travelled by a freight train leaving a train yard, we need to find the force exerted and the work done during the acceleration process.

The work done on an object is equal to the force applied multiplied by the distance travelled. In this case, the work done is given as \(1.10 * 10^1^0 J\), and the force required to accelerate the train is \(2.53 * 10^4 N\). We can use the formula for work:

Work = Force x Distance

Rearranging the formula to solve for distance:

Distance = Work / Force

Substituting the given values:

\(Distance = 1.10 * 10^1^0 J / 2.53 * 10^4 N\\= (1.10/2.53) * (10^1^0/10^4) J/N\\= 0.434 * 10^6 J/N\\= 4.34 x 10^5 J/N\)

Therefore, the distance calculated is \(4.34 * 10^5 J/N\).

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The best type of lighting to use in a geriatric medical office is natural or daylight-like lighting.

Natural or daylight-like lighting is considered the best choice for a geriatric medical office. It closely mimics the natural light conditions found outdoors, providing a balanced spectrum of light that is beneficial for both patients and healthcare professionals.

Natural lighting has several advantages. First, it enhances visual acuity and reduces eye strain, which is particularly important for elderly patients who may have age-related vision changes. Second, it helps regulate circadian rhythms and improve sleep-wake cycles, which can positively impact overall well-being and mood. Third, natural lighting creates a more pleasant and calming environment, potentially reducing stress and anxiety for patients.

To maximize natural lighting, large windows or skylights can be incorporated into the design of the medical office. In areas where natural light is limited, artificial lighting systems that closely resemble daylight can be installed, such as full-spectrum LED lights. These lights emit a broad spectrum of colors similar to natural sunlight, promoting a more comfortable and soothing atmosphere within the geriatric medical office.

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Objective:The objective of this experiment is to design a body ("slider") that can slide as quickly as possible down an inclined plane that is lubricated with SAE 10W-40.

The experiment is intended to identify the most efficient slider design, including material selection and weight, to optimize the slide down an inclined plane.In the following, we will explore the design for the slider and the inclined plane, which includes size and material specifications.Slider:Size:The slider should have a mass of no more than 0.5 kg. It's critical to ensure that the slider's weight doesn't create too much friction, slowing it down and making it less efficient.Material: Any metal alloy can be used for the slider's production.

However, lighter metal alloys, such as aluminum and titanium, are preferred because they reduce friction and improve sliding speed.Inclined Plane (Runway):Material:The runway is made of Lexan sheets on a wooden substrate. Lexan is a tough polycarbonate plastic that is commonly used in the construction of bulletproof windows and skylights. Its high-impact resistance and strength make it an excellent option for the inclined plane, reducing the possibility of damage from repeated testing.Length (sliding direction):

The sliding direction of the inclined plane is 2.0ft, providing sufficient distance for the slider to reach maximum speed.Inclination:The inclination of the inclined plane is 2.7 degrees, enabling the slider to slide quickly while still retaining control.Width:The inclined plane is 1.0ft wide, providing ample room for the slider to move freely while also ensuring that it does not wobble or shift sideways during the test.

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The electric field, E, at the midpoint between two charges is zero while the voltage, V, is negative.

Voltage is the energy per unit charge required to move a charge from one point to another. In the presence of an electric field, the potential difference between two points is expressed as a voltage. The potential difference between two points in a circuit is expressed in volts (V). The electric field is a vector field that is caused by electric charges. It is produced by the charges and affects other charges in the space around them. An electric field is a physical field that is produced by electrically charged objects and is a vector field that can be calculated for a point in space using Coulomb's law. The electric field is expressed as the force per unit charge that a test charge would feel if placed in the field.

This force is also expressed as the electric field strength at the point where the test charge is placed. When two charges of the same magnitude but opposite sign are placed at a certain distance from each other, the electric field lines will be drawn from the positive charge to the negative charge. At the midpoint between the two charges, the electric field, E, is zero. While the voltage, V, at the midpoint is negative since the potential at the positive charge is higher than the potential at the negative charge. Hence, V<0, E=0.

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Answer:

A. Neutrons have 0 Charge

Explanation

Neutrons have no charge for the same reason that plastics (and other insulators don't). They just don't.

"This isn't a great answer, but the thing with charge is that we don't really know what "charge" is. We know that certain "charged" objects will attract some objects, while repelling . We also know that other other "charged" objects will behave the same way, but when the two charged objects are brought together, they repell."

Answer:

3 hours

Explanation:

\((54 km)\frac{1 h}{18 km} = 3 h\)

Consider the Gaussian surface in the form of sphere, the electric field between the spheres is radially outwards.

For a positive charge, the electric field lines are projecting outwards of positive charge.

For a negative charge, the electric field lines are projecting inwards of positive charge.

Hence, the electric field points radially outwards.

The physical field that surrounds electrically charged particles, known as an electric field (or E-field), exerts force on all other charged particles in the field, either attracting or repelling them.  Additionally, it describes the physical environment of a system of charged particles. Time-varying electric currents and electric charges are the building blocks of electric fields. One of the four basic interactions (also known as forces) of nature, the electromagnetic field, manifests itself in both electric and magnetic fields.

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c it hink this because im geuss

At the instant shown, the six scenarios can be ranked in terms of the magnitude of current in the light bulb as follows:

1) Scenario 1 - Here, the battery is directly connected to the light bulb without any other resistors in the circuit. Therefore, the current flowing through the bulb will be the maximum among all the scenarios.

2) Scenario 3 - In this case, the battery is connected to the light bulb through a resistor. However, the resistance is less compared to other scenarios, so the current will be higher than in other cases.

3) Scenario 4 - Here, the battery is connected to the light bulb through a higher resistance compared to scenario 3. This will result in a lesser current in the bulb.

4) Scenario 5 - In this scenario, the battery is connected to the light bulb through a much higher resistance than in the previous two scenarios. Therefore, the current flowing through the bulb will be lower.

5) Scenario 6 - Here, the battery is connected to the circuit in such a way that the current will bypass the light bulb. Therefore, the bulb will not light up and the current flowing through it will be zero.

6) Scenario 2 - This scenario is similar to scenario 6 where the switch is open, so the circuit is not complete, and hence there will be no current flowing through the light bulb.

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Answer:

C)  Total displacement = 1275 m or 1.275 km

Explanation:

We'll break this into two parts:  

1) Displacement during constant speed, and

2) Displacement during the acceleration phase.

Constant Speed

The displacement for this segment is already stated:  1 km.  But the information includes the time, which will allow us to calculate the speed of travel.  We'll need this for the next phase of acceleration.

Distance = Speed x Time

Speed = Distance/Time

Time = 1 minute + 20 sec, or 80 sec.

Speed = 1 km/80 sec

Speed = 0.0125 km/sec

Since we'll be using meters (not km) in the next step, convert 0.0125 km/sec to m/sec with a conversion factor:  

  (0.0125 km/sec)*(1000m/1 km) = 12.5 m/sec

Acceleration Phase

The obect is moving at a speed of 12.5 m/sec (from above) and then accelerates at a rate of 0.125 m/sec^2 for 20 seconds.

The distance (s) an object travels during this acceleration (a) is gven by:

  s = vi*t + (1/2)a*t^2,

where vi is the initial velocity (12.5 m/sec in this case), a is the acceleration (0.125 m/sec^2), and t is the time (20 seconds).

s = (12.5 m/sec)(20 sec) + (1/2)(0.125 m/sec^2)*(20 sec)^2

s = 275 meters

Now add the two distances:

1) Constant Speed Phase = 1000 m

2)  Acceleration Phase    =  275 m

Total displacement = 1275 m or 1.275 km

Answer:

Your answer should be d: Foot

Explanation:

The unit "foot" is part of the english system which includes inches, feet, yards, etc.