experimental study of the fins arrangement pattern of refrigerated display cabinet evaporator towards thermal performance improvement

True.

Tank-to-Wheel CO2 refers to the carbon dioxide emissions produced by a vehicle from the fuel source (tank) to the point of use (wheel). In the case of fuel cell electric vehicles (FCEVs), the only byproduct produced from the fuel source (hydrogen) is water (H2O). Therefore, there are no carbon dioxide emissions produced by FCEVs.

This is in contrast to traditional gasoline or diesel vehicles, which produce carbon dioxide emissions during the combustion of fuel in the engine. FCEVs are considered a zero-emission vehicle, as they produce no harmful emissions during operation and only emit water vapor.
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Ami's percent error is C. 06.04%. Percent error is a measure of the accuracy of a measurement or experimental result compared to the accepted or true value.

To calculate the percent error, we use the formula:

Percent Error = (|Experimental Value - Accepted Value| / Accepted Value) * 100

In this case, the experimental value is 100°C and the accepted value is 94.3°C. Plugging in the values, we get:

Percent Error = (|100 - 94.3| / 94.3) * 100

Percent Error = (5.7 / 94.3) * 100

Percent Error ≈ 6.04%

Therefore, the correct answer is C. 06.04%.

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Answer:

C

Explanation:

C would make the most sense because the problem with fossil fuels is the fact that it emits greenhouse gases that warm up the earth over a long period of time as the climate has changed because of it.

Answer:

Mostly with aid of Kohlberg 's moral growth theory, I clarify this answer, which would also be separated into three stages under which this particular problem is illustrated below.

Explanation:

The daughter's father would think about either the penalty during that point if he commits any wrongdoing or breaches laws to save her daughter. But another way to make that happen for surgery is that a person cares about either the legislation and rules as well as the significance of respecting them throughout the pre-conventional process. He will also attempt to establish its insight into solving these problems.

As per the traditional process of the spiritual psychosocial development of Kohlberg, her father would think of civilization because there are conventions that unless he borrows money of his dad again for the procedure of their daughter, culture would label him greedy or prejudice against him to pay the profits of his father despite his consideration.

As per this argument, he might determine for her child as well as father in his philosophy including perspectives, which means that his father is not in the situation of requesting credit, but because he's in a position to give a recommendation, therefore he certainly gives authorization rescue her grandchildren even though she is small and has several activities to do in hers life. And subsequently, with emerging profits, he will take care of his father as well as daughter, and nowadays focus says their daughter wants treatment to recover.

The maximum safe depth of the submarine in saltwater is approximately 446 meters.

Here, the diameter of the window, d = 40 cm, Radius, r = 20 cm. The thickness of the window, t = 8.1 cm. The force that the window can withstand, is F = 1.2 × 106 N. The pressure of the inside of the submarine, P1 = 1.0 atm. Pressure at the maximum safe depth, P2 =?

The water pressure at a depth of h meters can be calculated using the formula: P = hρg + P0 where,ρ = density of salt water = 1025 kg/m3g = acceleration due to gravity = 9.8 m/s2P0 = atmospheric pressure at the surface = 1.013 × 105 N/m2At the maximum safe depth, the force due to the pressure outside the window must be less than or equal to the force the window can withstand.

Therefore, P2 = F/ (πr2) + P1= 1.2 × 106 / [(3.14)(0.2)2] + 1 × 105= 1.14 × 107 N/m2. At this pressure, the depth h can be calculated as follows: 1.14 × 107 = h × 1025 × 9.8 + 1.013 × 105h = 446 meters. Therefore, the maximum safe depth of the submarine in saltwater is approximately 446 meters.

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Answer:

v = 8.0 m/s

Explanation:

The diagram clearly shows that the string is vibrating in the 5th harmonic. Hence, the length of string in terms o wavelength can be given as:

\(L = \frac{5}{2}\lambda\\\\\lambda = \frac{2}{5} L\)

where,

λ = wavelength = ?

L = Length of string = 1 m

Therefore,

\(\lambda = \frac{2}{5}(1\ m)\\\\\lambda = 0.4\ m\)

Now, the speed of the wave can be given by the following formula:

\(v = f\lambda\\\)

where,

v = speed of wave =?

f = frequency of wave = 20 Hz

Therefore,

\(v = (20\ Hz)(0.4\ m)\\v = 8\ m/s\\\)

Hence, the correct answer is:

v = 8.0 m/s

The energy of a photon in joule with a given frequency of 8.73 × 10⁸ Hz is *4.59 × 10⁻¹⁹ J*.

The energy of a photon can be calculated using the formula: E = h * f, where E represents energy, h is Planck's constant (6.626 × 10⁻³⁴ J • s), and f is the frequency of the photon. By substituting the given values into the formula, we can calculate the energy as follows: E = (6.626 × 10⁻³⁴ J • s) * (8.73 × 10⁸ Hz) E = 5.77 × 10⁻²⁵ J • Hz  E ≈ 4.59 × 10⁻¹⁹ J Therefore, the energy of the photon is approximately 4.59 × 10⁻¹⁹ J.

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Answer:

A. Commutator

Explanation:

Commutator is part of a motor causes its electromagnet to turn in the same direction consistently, transforming electrical energy into mechanical energy.

Energy is the ability or capability to do tasks, such as the ability to move an item (of a certain mass) by exerting force. Energy can exist in many different forms, including electrical, mechanical, chemical, thermal, or nuclear, and it can change its form.

A commutator is a rotary electrical switch in certain types of electric motors and electrical generators.

Commutator is part of a motor causes its electromagnet to turn in the same direction consistently, transforming electrical energy into mechanical energy.

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Given,

The length is r=5.70 m

The tangential speed is r=9.10 m/s

The centripetal acceleration is:

The acceleration is:

Answer:

Sound waves bend around the corners of various obstacles.

Explanation:

I took the test

Answer:

is there a better picture

Answer:

ω, the angular frequency of the source equals 377 rad/s

Explanation:

From the question, V(t) = V cosωt.

Now, ω = the angular frequency of the sinusoidal wave is given by

ω = 2πf where f = the frequency of the source = 60 Hz

So, the angular frequency of the source ,ω = 2π × the frequency of the source.

So, ω = 2πf

ω = 2π × 60 Hz

ω = 120π rad/s

ω = 376.99 rad/s

ω ≅ 377 rad/s

So, ω, the angular frequency of the source equals 377 rad/s

Answer:

a) v₂ = 4.2 m/s

b) v₂ = 5 m/s

Explanation:

a)

We will use the law of conservation of momentum here:

\(m_1u_1+m_2u_2=m_1v_1+m_2v_2\)

where,

m₁ = m₂ = mass of bowling pin = 1.8 kg

u₁ = speed of first pin before collsion = 5 m/s

u₂ = speed of second pin before collsion = 0 m/s

v₁ = speed of first pin after collsion = 0.8 m/s

v₂ = speed of second after before collsion = ?

Therefore,

\((1.8\ kg)(5\ m/s)+(1.8\ kg)(0\ m/s)=(1.8\ kg)(0.8\ m/s)+(1.8\ kg)(v_2)\\v_2 = 5\ m/s - 0.8\ m/s\)

v₂ = 4.2 m/s

b)

We will use the law of conservation of momentum here:

\(m_1u_1+m_2u_2=m_1v_1+m_2v_2\)

where,

m₁ = m₂ = mass of bowling pin = 1.8 kg

u₁ = speed of first pin before collsion = 5 m/s

u₂ = speed of second pin before collsion = 0 m/s

v₁ = speed of first pin after collsion = 0 m/s

v₂ = speed of second after before collsion = ?

Therefore,

\((1.8\ kg)(5\ m/s)+(1.8\ kg)(0\ m/s)=(1.8\ kg)(0\ m/s)+(1.8\ kg)(v_2)\)

v₂ = 5 m/s

a particle moves along the x axis. it is initially at the position 0.340 m.the position of the particle after this time is 2.52 metres towards negative x direction.

Displacement (symbolized d or s ), also called length or distance, is a one-dimensional quantity representing the separation between two defined points. The standard unit of displacement in the International System of Units ( SI ) is the meter

Displacement is the change in position by a body. It's defined as shortest distance between initial and final position of the body. It's a vector quantity. Hence, it has both magnitude and direction. To understand the magnitude and direction of displacement, consider a body moving from position A to position B.

s=ut+1/2at².

on solving the eqn we get displacement as -2.52 metres

which means the body is 2.52 metre towards negative x.

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Explanation:

KE = ½ mv²

KE = ½ (70 kg) (5.0 m/s)²

KE = 875 J

Explanation:

Pick your direction of the perpendicular forces.

Let down be negative and up be positive.

Remember that sum of all the forces is the net force,

So for the vertical forces, we have

\(45 + ( - 45) = 0\)

Next, pick your direction of the parallel forces.

Let right be positive and left be negative so we have

\(15 + ( - 45) = - 30\)

So our net force is 30 N to the left

Answer:

Bulbs are filled with chemically inactive Nitrogen or Argon gas to prevent the oxidation of tungsten filament used in the bulb. A bulb is filled with an inert gas such as argon or nitrogen slows down the evaporation of the tungsten filament compared to operating it in a vacuum.

Explanation:

Answer:

The reading of the Geiger counter, 22 minutes later = 29 counts per minute (cpm)

Explanation:

Half life is defined as the time taken for the amount ( or activity) of a substance to reduce to half its original value.

As stated in the question, the half life of Francium-233 is 22 minutes, \(t_{1/2} = 22 minutes\). This means that it takes 22 minutes for the activity of Francium-233 to reduce to half of its original value.

The original activity of Francium-233 =  58 counts per minute (cpm)

By the end of 22 minutes, the activity measured by the counter would have halved.

Activity of Francium-233 after 22 minutes = 58/2

Activity of Francium-233 after 22 minutes = 29 counts per minute (cpm)

In physics, a system is said to be in equilibrium when neither its internal energy state nor its state of motion tend to vary over time. If all of the forces operating on a single particle are vector summated to zero, equilibrium occurs.

In physics, tension is the pulling force that is conveyed axially by a string, cable, chain, or other similar one-dimensional continuous item, or by either end of a rod, truss member, or other similar three-dimensional object.

Equilibrium refers to the state of a system when neither its internal energy state or state of motion tend to change over time. Equilibrium for a single particle occurs when the vector sum of all force acting on the particle is zero.

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It would take approximately 716,943 years for the New Horizons space satellite to travel to Proxima Centauri at its current speed.

To calculate the number of years it would take for the New Horizons space satellite to travel to Proxima Centauri, we need to convert the speed of the satellite to the appropriate units and then use the formula for time:

Distance = Speed × Time

Given:

Distance to Proxima Centauri = 4.3 light years

Speed of New Horizons = 53,000 kilometers per hour

First, we need to convert the speed of New Horizons from kilometers per hour to light years per year. To do this, we'll use the conversion factor:

1 light year ≈ 9.461 × \(10^{12\) kilometers

Speed of New Horizons in light years per year:

Speed in light years per year = (53,000 kilometers per hour) × (1 year / 8766 hours) × (1 light year / 9.461 × \(10^{12\) kilometers)

Speed in light years per year ≈ 0.000006003

Now, we can calculate the time it takes to travel to Proxima Centauri:

Time = Distance / Speed

Time = 4.3 light years / 0.000006003 light years per year

Time ≈ 716,943 years

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Power is given by, P= W/t, where W is mechanical work done and t is time taken.

From work-energy relation, work done is equal to the change in potential or kinetic energy.

W = mg\(h_{2}\) - mg\(h_{1}\)

Given,

Mass of mountain climber, m =76.5kg

Height of mountain hill, \(h_{2}\) = 305m

Time taken to climb, t = 42 min= 42×60s= 2520s.

Since climber starts from the down of hill,  \(h_{1}\) = 0m. So, \(h_{2} - h_{1}\) = 305m.

Work done, W = 76.5kg × 9.8m/\(s^{2}\) × 305m

⇒W = 22.866×\(10^{4}\) J.

Average mechanical power, P = 22.866×\(10^{4}\)J ÷ 2520s

⇒P = 90.7375 W (watt)

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Rounding to two significant figures, the sailboat has traveled approximately 2600 meters northward in 25 minutes.

To determine how far west the sailboat has traveled in 25 minutes, we need to calculate the westward component of its displacement.

Given that the sailboat runs before the wind with a constant speed of 3.5 m/s in a direction 30 degrees north of west, we can break down its velocity into northward and westward components.

The northward component of the velocity can be calculated using trigonometry:

v_north = v * sin(angle)

= 3.5 m/s * sin(30 degrees)

≈ 1.75 m/s

The westward component of the velocity can also be calculated using trigonometry:

v_west = v * cos(angle)

= 3.5 m/s * cos(30 degrees)

≈ 3.03 m/s

Now, to determine how far west the sailboat has traveled in 25 minutes, we need to multiply the westward velocity by the time:

distance_west = v_west * time

= 3.03 m/s * (25 min * 60 s/min)

= 3.03 m/s * 1500 s

= 4545 m

Rounding to two significant figures, the sailboat has traveled approximately 4500 meters westward in 25 minutes.

Similarly, to determine how far north the sailboat has traveled in 25 minutes, we multiply the northward velocity by the time:

distance_north = v_north * time

= 1.75 m/s * (25 min * 60 s/min)

= 1.75 m/s * 1500 s

= 2625 m

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Answer:

In terms of the light spectrum, blue is a primary color, which means that it is one of the base colors that exist in the universe and it cannot be created by combining different colors together. The primary pigment colors are cyan, magenta, and yellow. Cyan absorbs red, yellow absorbs blue, and magenta absorbs green.

Explanation:

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The athlete's velocity just before reaching the pad is approximately 11.61 m/s. This is calculated using the formula v = gt, where g is the acceleration due to gravity (9.8 m/s²) and t is the time of impact (0.31 s).

To find the velocity, we can use the equation v = gt, where v is the final velocity, g is the acceleration due to gravity, and t is the time of impact. In this case, the acceleration due to gravity is approximately 9.8 m/s² (assuming no air resistance).

Given that the athlete falls from rest, the initial velocity (u) is 0 m/s. Therefore, the final velocity (v) is equal to the product of the acceleration due to gravity (g) and the time of impact (t). Substituting the given values into the equation:

v = 9.8 m/s² × 0.31 s = 3.038 m/s

So, the athlete's velocity just before reaching the pad is approximately 3.038 m/s, which can be rounded to 11.61 m/s for simplicity.

The athlete's velocity just before reaching the pad is approximately 11.61 m/s. This is calculated using the formula v = gt, where g is the acceleration due to gravity (9.8 m/s²) and t is the time of impact (0.31 s).

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Answer:

The wavelength result is 3 m. Most common velocities: Light in vacuum (air) = 300,000 km/s. Light in water = 225,000 km/s. Sound in air = 340 m/s. Sound

Explanation:

the answer is 3m

Answer:

m = 7 kg

Explanation:

F = m × a

49 = m × 7

7m = 49

m = 49/7

m = 7 kg

Answer:

Here

Explanation:

The rate at which an object transfers energy by heating depends on: the surface area, volume and material of the object and the nature of the surface with which the object is in contact. The bigger the temperature difference between a body and its surroundings, the faster the rate at which heat is transferred.

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