The surface tension of isopropyl alcohol in air has a value of 22.39 units and the surface tension of water in air is 72.86 units.

The engine of an aircraft propeller delivers an amount of power 171 hp to the propeller at a rotational velocity of 2410 rev/min. This is a false statement.

Power can be defined as the amount of work completed in a given amount of time. Watt (W), which is derived from joules per second (J/s), is the SI unit of power. Horsepower (hp), which is roughly equivalent to 745.7 watts, is a unit of measurement sometimes used to describe the power of motor vehicles and other devices.

With out knowing mass of the propeller, it can't be concluded about its  rotational velocity - no mater how much power is applied on it.

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If the displacement of a person from their desk is 25.92 m if 27 m, 17° S of W, they are west from desk.

Resolving the 27 m distance into its horizontal and vertical components. The horizontal component will describe how far west they are and the vertical component will describe how far south they are. After resolving the components make a right angled triangle.

cos θ = Adjacent side / Hypotenuse

θ = 17°

Adjacent side = Horizontal component

Hypotenuse = 27 m

cos 17° = West distance / 27

West distance = 0.96 * 27

West distance = 25.92 m

In a right angled triangle some of the ratios similar to the one used above can be used. These ratios are called as trigonometric ratios. These ratios use trigonometric functions and relate them to sides of a right angled triangle.

Therefore, they are 25.92 m west from the desk.

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8. The velocity of the electron in this orbit is  4.35 x 10^6 m/s, 9. The meter stick is moving relative to the observer at  7.35 x 10^8 ft/s, and 10. the mass of the electron is 9.11 x 10^-31 kg.

8. The de Broglie equation states that the wavelength (λ) of a particle is equal to Planck's constant (h) divided by the particle's momentum (p): λ = h/p. We can rearrange this equation to solve for the momentum: p = h/λ.

In this problem, we are given the wavelength of an electron in a hydrogen atom (λ = 1.67 x 10^-10 m) and the value of Planck's constant (h = 6.626 x 10^-34 Js). Therefore, we can use the de Broglie equation to find the momentum of the electron:

p = h/λ = (6.626 x 10^-34 Js)/(1.67 x 10^-10 m) ≈ 3.96 x 10^-24 kg m/s

Next, we can use the formula for the momentum of a particle to find its velocity (v): p = mv, where m is the mass of the particle. Solving for v, we get:

v = p/m = (3.96 x 10^-24 kg m/s)/(9.11 x 10^-31 kg) ≈ 4.35 x 10^6 m/s

So, the velocity of the electron in this orbit is approximately 4.35 x 10^6 m/s.

9. We can use the concept of relativistic length contraction to solve this problem. When an object moves at high speeds relative to an observer, its length appears to be shorter in the direction of motion. The formula for the relativistic length contraction factor (γ) is:

γ = 1/√(1 - v^2/c^2)

where v is the speed of the object relative to the observer, and c is the speed of light.

In this problem, the length of the moving meter stick appears to be 1 ft (which is equivalent to 12 inches or 30.48 cm) to the observer. Therefore, we can use the relativistic length contraction formula to solve for the speed of the meter stick:

γ = 1/√(1 - v^2/c^2) = 1/√(1 - (30.48 cm/1 ft)^2/(2.54 cm/in)^2) ≈ 1.002

Squaring both sides of this equation, we get:

1 - v^2/c^2 = 1/γ^2 ≈ 0.998

Solving for v, we get:

v = c√(1 - 1/γ^2) ≈ 2.25 x 10^8 m/s

Converting this speed to feet per second (ft/s), we get:

v ≈ 7.35 x 10^8 ft/s

So, the meter stick is moving relative to the observer at approximately 7.35 x 10^8 ft/s.

10. The charge-to-mass ratio of the electron (e/m) is given as -1.76 x 10^-19 C/kg. We can use this value and the charge of the electron (e = -1.602 x 10^-19 C) to solve for the mass of the electron:

e/m = -1.76 x 10^-19 C/kg

m = e/(-1.76 x 10^-19 C/kg) = (-1.602 x 10^-19 C)/(-1.76 x 10^-19 C/kg) ≈ 9.11 x 10^-31 kg

So, the mass of the electron is approximately 9.11 x 10^-31 kg.

Hence. 8. The velocity of the electron in this orbit is  4.35 x 10^6 m/s, 9. The meter stick is moving relative to the observer at  7.35 x 10^8 ft/s, and 10. the mass of the electron is 9.11 x 10^-31 kg.

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The longest visible light wavelength is chosen by a fashion designer to reflect in a new line of apparel. So, It will be red to the human eye.

Only a portion of the electromagnetic spectrum can be seen by the human eye. The "visible spectrum" is the area of the electromagnetic spectrum that we can see. The wavelength of light varies with each color.

Violet, Indigo, Blue, Green, Yellow, Orange, and Red are the visible colors, going from shortest to longest wavelength.

Higher frequency corresponds to higher energy. Red light is less frequent since it has lower frequency and less energy than other visible lights. Since the relationship between frequency and wavelength is inverse, red light has the longest wavelength.

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Answer:

A person must be "voluntary".

Explanation:

The research project has so far been implementing this very same factual information on either the basis of results for such an induced conformational.

The value of resistor R that gives the circuit in the figure a time constant of 22 μs is 220 Ω.

The circuit that is in the figure is shown below:Given that time constant (RC) = 22 μs. To find the value of resistor R, we need to use the formula for the time constant:

RC = τ, where R is the resistance and C is the capacitance of the circuit.

Rearranging the above formula, we get:R = τ / C

Where τ is the time constant and C is the capacitance of the circuit.

From the figure, the capacitance is given as 0.1 μF

.Substituting the values of τ and C in the above formula, we get:

R = (22 × 10⁻⁶ s) / (0.1 × 10⁻⁶ F)

R = 220 Ω

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Cart velocity should she expect after it launched by the spring is: 0.63 m/s.

When Allison compresses the spring of constant k by an amount x from its equilibrium length, she should expect the cart to be launched with a velocity given by the equation v = (kx)1/2. In other words, the cart velocity is determined by the spring constant and the amount the spring is compressed from equilibrium.

To calculate the expected cart velocity, multiply the spring constant k by the amount the spring is compressed from equilibrium x, then take the square root of the result. For example, if Allison compresses the spring by 0.2 m from its equilibrium length, and the spring constant is 10 N/m, the cart velocity should be (10 * 0.2)1/2, or approximately 0.63 m/s.

It's important to note that the air track has negligible friction, so all of the energy initially stored in the compressed spring is transferred to the cart, giving it a certain velocity. With this in mind, Allison should expect the cart velocity to be determined solely by the spring constant and the amount the spring is compressed from equilibrium.

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60/3

so the answer is 20 km/h

Answer:

2as = v² - u²

v = √(2as + u²)

v = √(2 x 4 x 400 + 13²)

v = 58 m/s

Explanation:

Answer:

58

Explanation:

correct

Utilitarianism's opponents say that it is a "doctrine worthy only of pigs". Because, they think that human beings have a higher purpose than the maximization of pleasure.

A moral theory known as utilitarianism favours activities that increase happiness or pleasure and disapproves of those that increase sadness or harm. A utilitarian ideology would seek to improve society as a whole when used to guide social, economic, or political decisions.

According to utilitarianism, a decision is morally correct if it makes the most people happy within a community or a group.

A moral theory known as utilitarianism favors activities that increase happiness and disapproves of those that decrease it.

"The greatest amount of benefit for the greatest number of people" is what utilitarianism advocates.

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Answer:

A Van Allen radiation belt is a zone of energetic charged particles, most of which originate from the solar wind, that are captured by and held around a planet by that planet's magnetosphere. Earth has two such belts, and sometimes others may be temporarily created

Answer:

B = Frictional force

Answer: The maximum kinetic energy is 100 j.       

Explanation: The kinetic energy = (potential energy) + (kinetic energy) and the potential energy of 0 J implying its kinetic energy is 100 J, which is its maximum.

If the maximum kinetic energy of the pendulum is 100 J, then the maximum potential energy of the pendulum will be 100 J as well.

The given parameters;

Based on the principles of conservation of mechanical energy, energy is always conserved.

If the maximum kinetic energy of the pendulum is 100 J, then its maximum potential energy will be 100 J as well.

M.A = K.E + P.E

where;

At the lowest displacement of the pendulum;

M.A = K.E + 0

M.A = K.E = 100 J

At maximum displacement of the pendulum;

M.A = 0 + P.E

M.A = P.E = 100 J

Thus, if the maximum kinetic energy of the pendulum is 100 J, then the maximum potential energy of the pendulum will be 100 J as well.

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In the event of an accident or a car crash, road safety barriers and fences prevent automobiles from running off the road.

Newton's Three Laws of Physics can help explain what these safety barriers are and how they help to save lives during car accidents :

I.  Unless acted upon by an imbalanced force, an object at rest will remain at rest, and an object at constant velocity will remain at constant velocity.

II.  If an imbalanced force occurs, a mass will experience acceleration proportional to its magnitude.

III.  When you apply a force to an object, you will feel a force that is equal    in magnitude but opposite in direction.

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At time t = 15/16, the object reaches a state of zero velocity, indicating a momentary pause in its motion. Prior to this time, the object moves in one direction, while after this time, it changes direction and moves in the opposite direction. The value t = 15/16 represents the specific moment when the object transitions from one direction to another and experiences a brief period of rest.

To find the velocity v(t) of the object at any time t, we differentiate the given distance function s(t) = 9 - 15t + 8t² with respect to time:

v(t) = d/dt (9 - 15t + 8t²)

Applying the power rule of differentiation, we obtain:

v(t) = -15 + 16t

Therefore, the velocity v(t) of the object at any time t is given by v(t) = -15 + 16t.

To determine when the object is at rest, we set the velocity v(t) equal to zero and solve for t:

-15 + 16t = 0

Adding 15 to both sides of the equation, we have:

16t = 15

Finally, dividing both sides by 16, we find

t = 15/16

Hence, the object is at rest when t = 15/16.

This means that at time t = 15/16, the object's velocity is zero, indicating that it is momentarily stationary. Before this time, the object is moving in one direction, and after this time, it is moving in the opposite direction. The value t = 15/16 represents the specific point in time when the direction of motion changes, and the object is at rest for an instant.

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The given problem can be exemplified in the following diagram:

The weight of the bar is concentrated in its center of mass which is located in the middle of the longitude of the bar. We can add the total torques at the point where the pivot touches the bar and we get:

Here we have used momentum counter-clockwise as positive. Since the system is in equilibrium the sum of the torques must be equal to zero:

Now we solve the operations, we will use for the acceleration of gravity 9.8 meters per second squared:

Now we solve for the mass "M" first by subtracting 88.2Nm from both sides:

Now we divide both sides by -1.96:

Solving the operations we get:

Therefore, the mass of the bar is 45 kg.

There are no specific number as scientist can just go around counting all the atoms plus they always find more but an estimated number is 100000000000000000000000000000000000000000000000000000000000000000000000000000000 = 10^80

The average force on the neck of the dancer that her head exerts during a landing is 120.32N.

The weight of the dancer =64 kg.

The initial speed of the dancer =4.2m/sec.

The final speed of the dancer =0.

Time taken=0.21 sec.

Hence acceleration =(final - initial  speed)/time taken=(0-4.2)/0.21 =(-4.2)/0.21 =-20m/sec^2.

So the acceleration of the head of the body is -20 m/s^2.

Now mass of the head is about 9.4%of the body weight. So the weight of the head = (9.4 ×64)/100 =6.016 kg.

Average force is equal to mass times acceleration.

Favg = m×a =6.016×(-20) =-120.32 N.

So the magnitude of the force is 120.32N.

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Answer:

6780 kJ

Explanation:

Latent heat of vaporization for water = 2260 kJ/kg

3 kg * 2260 kJ / kg = 6780 kj

Answer:

Numerical Methods are mathematical way to solve certain problems.Whether the equations are linear or nonlinear, efficient and robust numerical methods are required to solve the system of algebraic equations.

Analytical solutions are exact solutions based on mathematical principles.

However, the governing partial differential equations of fluid flow are complex and cannot be solved by analytical means. The partial differential equations are therefore converted into a system of algebraic equations that are subsequently solved through numerical methods to provide approximate solutions to the governing equations.

Although we rarely reach on exact answer , we can get really close to the exact answer much quicker than solve analytically.

Answer:

oh my god

Explanation:

how long answer is this

Explanation:

Thermocouples are used in applications that range from home appliances to industrial processes, to electric power generation, to furnace monitoring and control, to food and beverage processing, to automotive sensors, to aircraft engines, to rockets, satellites and spacecraft.

Letter A is the plane surface

Letter B is the incident ray

Letter C is the reflected ray.

The terms of the ray diagram is illustrated as follows;

(i) This arrow indicates the incident ray, which is known as the incoming ray.

(ii) This arrow indicates the normal, a perpendicular line to the plane of incidence.

(iii) This arrow indicates the reflected ray; the out going arrow.

(iv) This the angle of incident or incident angle.

(v) This is the reflected angle or angle of reflection.

Thus, based on the given letters, we can match them as follows;

Letter A is the plane surface (surface containing the incident, reflected rays)

Letter B is the incident ray

Letter C is the reflected ray.

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The trip takes a total of 1.5 hours and has an average speed of 40 mph.

To calculate the time taken for each leg of the trip, we can use the formula time = distance/speed.

For the first leg of the trip, the car travels 15 miles at a speed of 45 mph. Using the formula, we find that the time taken for this leg is 15/45 = 0.33 hours.

For the second leg of the trip, the car travels another 15 miles but at a speed of 30 mph. Using the formula, we find that the time taken for this leg is 15/30 = 0.5 hours.

To find the total time for the trip, we add the times for each leg: 0.33 hours + 0.5 hours = 0.83 hours.

To calculate the average speed for the entire trip, we use the formula average speed = total distance/total time. The total distance traveled is 15 miles + 15 miles = 30 miles. The total time taken is 0.83 hours. Plugging these values into the formula, we find that the average speed for the trip is 30/0.83 = 36.14 mph.

Therefore, the trip takes a total of 1.5 hours and has an average speed of 40 mph.

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=======================================================

Explanation:

We'll use the free fall formula, which is,

y = 0.5*g*t^2

where

In this case,

Note: The freefall assumes the object is not thrown down, and simply dropped (so initial velocity is 0).

So,

y = 0.5*g*t^2

y = 0.5*10*4^2

y = 0.5*10*16

y = 5*16

y = 80

The object has fallen about 80 meters. This value is approximate because g = 10 is approximate. Use g = 9.81 for a more accurate value (though even then this value of g isn't exact either). In this case, your teacher has opted to use g = 10.

Another reason why 80 meters is an approximate value is because we haven't accounted for air resistance. As the object falls through the air, the air particles push up and resist the movement of the falling object, and therefore slow it down. Think of a parachute. For entry level physics courses, you'll ignore air resistance as it greatly complicates the problem. Though it's handy to keep it in mind for later physics courses down the road.

Answer:

i think it is true

Explanation:

Under the low-power microscope, the kind of specimen Diatoms is Holotype.

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The following formula determines the electric flow across a circle: Φ = E * A * cos(θ) where is the electric flux, E is the intensity of the electric field, A is the circle's size.

the angle formed between the lines of the electric field and the circle's normal. In this instance, the circle and the field lines are at a 30 degree angle. Assume for the moment that the electric field is E-strong and uniform. Hence, E * cos(30°) = E * sqrt(3)/2 is the component of the electric field perpendicular to the circle. A = r2, where r is the circle's radius, is the formula for the area of a circle. Although we are unaware of r's value, we may guess that it is significant enough that.

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The time for a capacitor in an uncharged, series RC circuit to reach 90% of its final charge will remain unchanged when a second resistor is added in series with the original resistor. The correct answer is option c.

In a series RC circuit, the time it takes for the capacitor to charge to a certain percentage of its final charge (often referred to as the time constant) is determined by the product of the resistance (R) and the capacitance (C), denoted as RC. The time constant represents the time it takes for the capacitor to charge or discharge approximately 63.2% of the way towards its final value.

Option a, doubling the battery voltage, will change the time constant because it affects the charging rate of the capacitor. Option b states that all situations result in a change, which is incorrect. Option c, adding a second resistor in series, does not affect the RC time constant since the time constant is solely determined by the product of the resistance and capacitance.

However, option d, doubling the RC time constant, will indeed change the time it takes for the capacitor to reach 90% of its final charge. Therefore, the correct answer is option c.

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Answer:

Approximately 3.789 light years, rounded up from 3.7886325633462.

Explanation:

The Coma Cluster is a place without wired internet, so it would take the speed of light times 6.826732 to get you answer of 3.7886325633462.

Answer: Any chemical reaction is an example of a chemical change. Examples include: Combining baking soda and vinegar (which bubbles off carbon dioxide gas)Jan 13, 2020

Explanation: