A 50. 0-kg block is being pulled up a 15. 0 degrees slope by a force of 250 n which is parallel to the slope, but the block does not slide up the slope. What is the minimum value of the coefficient of static friction required for this to happen?.

Answer:

No

Explanation:

Electromagnetic radiation is used for communications and transmission of information. The waves that are used in this way are radio waves, microwaves, infrared radiation and light.

Values calculated are as : ω is 3160 rad/sec; R is 175 ohm;  Imax= 0.143 A  and t= 0.000331 sec.

An LRC circuit is also known as a tuned circuit, or an RLC circuit It is an electrical circuit consisting of an inductor (L), capacitor (C), and resistor (R) connected in series or parallel.

= √//( 8 *10^-3 * 12.5 * 10^-60

= 3160 rad/sec.

2. Impedance:

Z= √R² + (XL - Xc)²=

= √R²

= 175 ohm

3. Imax= V/Z

= 25/175

= 0.143 A

I = Imax cosωt

Imax/2= I max cosωt

cosωt= 1/2

t = 0.000331

v= Vcosωt= 12.5 V

VR = IRcosωt= 12.5 V

voltage across the capacito

Vc = IXc Cos(ωt - π/2)

= 3.13 V

voltage across the inductor

VL=  IXL Cos(ωt + π/2)

= -3.13V

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

Question: An L-R-C series circuit is constructed using a 175Ω resistor, a 12.5μF capacitor, and an 8.00-mH inductor, all connected across an ac source having a variable frequency and a voltage amplitude of 25.0 V.

1-At what angular frequency will the impedance be smallest?

2-What is the impedance at this frequency?

3-At the angular frequency in part A, what is the maximum current through the inductor?

4-At the angular frequency in part A, find the potential difference across the ac source, the resistor, the capacitor, and the inductor at the instant that the current is equal to one-half its greatest positive value.

All the options given should be part of solving any problem in physics.

Physics problem-solving calls for a methodical and meticulous approach. First and foremost, it's critical to attentively analyze the problem and comprehend the condition presented.

A situational drawing might aid in visualizing the issue and highlighting any crucial elements. Next, it's important to note down each and every variable that the problem provides. The next step is to consider whether physics concepts are applicable to the issue and choose the appropriate equations to apply them.

Once the calculation has been completed, it is crucial to double-check the answer's units to make sure they are formatted correctly. Finally, evaluate the reasonableness of your response and make any required modifications.

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The equation that represents the principle of the lever balance is:

The principle of moments states when a body is in equilibrium, the sum of the clockwise moment about a point equals the sum of anticlockwise moment about that point.

A see-saw represents a balanced system of moments.

The sum of clockwise moment = The sum of anticlockwise moments.

Assuming W1 and W2 are clockwise moments and W3 and W4 are anticlockwise moments.

The equation will b:  W₁ + W₂ = W3 + W4

In conclusion, a balanced see-saw illustrates the principle of the lever balance.

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Answer:

Filtration is a method for separating an insoluble solid from a liquid. When a mixture of sand and water is filtered: the sand stays behind in the filter paper (it becomes the residue ) the water passes through the filter paper (it becomes the filtrate )

Explanation:

Listo!

Answer:

h=103.528m

Explanation:

I have explained everything in the attached photo. make sure to ask me questions if you don't understand any part.

The magnitude of the magnetic force (F) on a straight conducting rod can be expressed in terms of the length (l) of the rod, current (I) flowing through it, and the magnetic field (B) it is placed in.

The formula to calculate the magnetic force is given by the equation F = BIL, where B is the magnetic field strength, I is the current, and L is the length of the rod.

This equation is derived from the Lorentz force law, which states that the force experienced by a current-carrying conductor in a magnetic field is proportional to the current, magnetic field, and length of the conductor.

By multiplying the magnetic field strength (B) by the current (I) and the length (L), we can determine the magnitude of the magnetic force acting on the rod.

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Answer:

TRUE

Explanation:

Answer:

what?

Explanation:

When one wave crest overlaps with  the crest of another and they add together and their amplitude increases. Hence, C is correct.

Amplitude of a wave is the distance from the midpoint of a crest to its top or the distance from the midpoint of a trough to its bottom. For a wave the peak to the top is called crest and peak to the bottom or decline is called troughs.

When two waves overlap by crest of one wave and trough of another wave, then their amplitude will decrease and it is called destructive interference.

Amplitude of a wave is directly related to its intensity. High amplitude waves are intense. When two waves overlaps by their crests and add up together their amplitude will be the sum of amplitudes of both waves. This is called constructive interference. Hence, option C is correct.

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The particles of a solid are in fixed positions, the particles of a liquid do not translate to a large extent while the particles of a gas has extreme degree of freedom.

We have to refer to the kinetic molecular theory at this point. We would recall from the theory that the particles that compose a substance are said to be in a constant random motion. As such, the molecules of a gas do have the greatest degree of freedom thus they move about freely. On the other hand, the molecules that compose a solid have the least degree of freedom as they remain in their fixed positions and can only vibrate.

Billiard balls are free to have about and they move at high speeds since they are spaced from each other. This is the nature of the interaction between the molecules of a gas.

Students in a hall way that is crowded can be used to approximate liquid particles because they do not posses a high degree of freedom but the molecules could move a few inches away from each other.

For a solid. an apt approximation is the  audience in a movie theater. This is because, they can only remain on their seats just as the particles in a solid retain a fixed position and do not translate.

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Answer:

zero work is done by the worker

The average thrust of the rocket engine to burnout is 4308.8 kN, the burnout time of the rocket is 140 seconds, and the speed at burnout is 8.91 km/s.

The force generated by the engine of the rocket is thrust. For the movement of the rocket, thrust is required. The rocket's mass and the acceleration it achieves as a result of the thrust are directly proportional.The initial weight of the single stage rocket is 500 kN, of which 420 kN is fuel, the weight of payload weight is 40 kN and the structural mass of the booster is 40 kN.Thus, the weight of the rocket is the sum of the weight of the fuel, the weight of the payload, and the weight of the structural mass of the rocket, which is 420 + 40 + 40 = 500 kN. Since the rocket starts from rest, the initial velocity of the rocket is zero and the distance covered by the rocket is also zero. Thus, the initial acceleration of the rocket is zero. When the rocket engine is ignited, it exerts a force called thrust, which is equal to the rate at which the rocket engine expels mass multiplied by the exhaust velocity. The mass of fuel ejected per second is the fuel burn rate, which is 3 kN/s. The exhaust speed is 3 km/s, so the thrust exerted by the rocket engine is given by the product of fuel burn rate and exhaust speed. Thus, the average thrust of the rocket engine to burnout can be determined by the formula: T = * + / * , where T is the average thrust of the rocket engine to burnout, is the mass of the rocket at any time t, is the acceleration due to gravity, is the exhaust velocity, and is the time taken to burn the entire fuel. = 500 – 3 (mass of the rocket after time t), = 9.6 m/s², and = 3 km/s or 3000 m/sThus, T = (500 – 3) * 9.6 + 3 * 10³ = 4800 – 28.8 + 3000The burnout occurs when the fuel runs out. = 500 – 3 = 0t = 500/3 seconds = 166.67 seconds Therefore, the average thrust of the rocket engine to burnout is T = 4800 – 28.8(166.67) + 3000 = 4308.8 kN. The burn time of the rocket is the time it takes to burn all of the fuel and reach burnout. The rocket's burnout time can be determined using the fuel burn rate, which is 3 kN/s and the mass of fuel in the rocket, which is 420 kN. Since the mass of fuel ejected per second is constant, the burn time of the rocket is obtained by dividing the mass of fuel by the fuel burn rate. = 420 kN, / = 3 kN/st = // = 140 seconds Thus, the burnout time of the rocket is 140 seconds

The velocity of the rocket at burnout is obtained by integrating the thrust of the rocket engine with respect to time. = 500 – 3 = 80 kN, = 9.6 m/s², and = 3 km/s or 3000 m/sT = * + / * = 768 + 240000/The velocity of the rocket at burnout is the integral of the thrust from zero to the time of burnout, divided by the mass of the rocket at burnout. = 1/80 * ∫₀¹⁴₀ (768 + 240000/) = 8.91 km/s Thus, the speed at burnout is 8.91 km/s.

The average thrust of the rocket engine to burnout is 4308.8 kN, the burnout time of the rocket is 140 seconds, and the speed at burnout is 8.91 km/s.

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Erik Erikson believes that midlife involves a psychosocial crisis characterized by generativity versus stagnation. This stage focuses on establishing and nurturing the next generation, contributing to society, and finding a sense of accomplishment.

This crisis occurs in the stage of adulthood known as middle adulthood, typically between the ages of 40 and 65 years old. Generativity refers to a sense of productivity and accomplishment in one's work, family, and community, while stagnation refers to a lack of growth and development in these areas.

During this stage, individuals may reflect on their past accomplishments and failures and begin to focus on leaving a legacy for future generations. They may also experience a sense of loss or regret if they feel they have not achieved their goals or contributed meaningfully to their communities. Erikson believed that successfully navigating this crisis requires finding a balance between caring for oneself and others, maintaining productivity and creativity, and developing a sense of purpose and meaning in life.

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Answer:

Radio waves

Explanation:

Answer:

The bear is actually sharpening his claws. That's the only reason he scratches a tree with his claws

Explanation:

Option A. The absolute brightness of a star depends on its size and temperature

The absolute brightness of a star is the amount of light it emits at a standard distance from Earth, regardless of how far away it actually is.

The size and temperature of a star are the primary factors that determine its absolute brightness. The size of the star affects the amount of light it emits, with larger stars emitting more light. The temperature of a star affects the color of the light it emits, with hotter stars emitting bluer light and cooler stars emitting redder light. Both of these factors play a significant role in determining a star's absolute brightness.

Distance and color can also affect a star's brightness, but in different ways. The distance of a star affects its apparent brightness as seen from Earth, but not its absolute brightness. The color of a star can provide information about its temperature and composition, but does not directly determine its absolute brightness.

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The prove of  Angle XYZ- Angle NYM is given below:

Note that from the image given;

Since ∠XYZ is said to be congruent to ∠NYM it can be proven by the use of the reflexive property.

The reflexive property is one that informs that any shape is regarded congruent to itself.

Since ∠NYM has a different way to call ∠XYZ that uses a different vertexes, but the sides are made up of the two angles which are said to be the same.

Therefore , ∠XYZ ≡ ∠NYM are proved by the reflexive property.

Since ΔXYZ is the same with Δ NYM, it can be proven by the AA (angle-angle) similarity theorem.

We have 2 angles Δ XYZ and Δ NYM:

Note that ∠YXZ ≡ ∠YNM

              ∠XYZ ≡ ∠NYM

So,  ΔXYZ is said to be the same to ΔNYM and it is proven by the AA similarity theorem.

Therefore, The prove of  Angle XYZ- Angle NYM is given below:

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Answer:

1. parrael

2. corresponding angles theorem

3. NYM

4. AA

Explanation:

just took it

Answer:

10

Explanation:

300 ÷ 30 = 10

Answer - 10

Hope this helps!!!

The number of bright stars in a nearby cluster can also be determined from a single photograph by analyzing the cluster's luminosity function.

It is impossible to measure the rate at which a variable star brightens and dims from a single photograph. The rate at which a variable star brightens and dims cannot be measured from a single photograph. A variable star is a star that changes brightness over time, and their light curves are often used to study them. Light curves are plots of brightness over time, and they are used to study the properties of variable stars.

It is difficult to measure the rate at which a variable star brightens and dims from a single photograph because it is necessary to observe the star over a long period to obtain a complete light curve. Variable stars can be used to study a variety of phenomena in astronomy, including the evolution of stars, the structure of galaxies, and the expansion of the universe. The brightness of a star in our sky can be measured from a single photograph by measuring its apparent magnitude.

The apparent magnitude of a star is a measure of its brightness as seen from Earth. The general shape of an interstellar gas cloud can also be determined from a single photograph by analyzing its morphology. The color of a planet can also be determined from a single photograph by analyzing the wavelengths of light reflected by its atmosphere. Finally, the number of bright stars in a nearby cluster can also be determined from a single photograph by analyzing the cluster's luminosity function.

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Answer:

earlier when there is no pandemic ( corona virus ) then rarely people give time to fitness/ excercise routine. But now, because of pandemic many people give more enthusiasm in fitness . In India we are motivated to do yoga. In this case, our culture has been back u can say. Lot of people startted doing yoga . Because of fitness in this pandemic no one will feel isolated with this u will be healthy .

Explanation:

pls like it ️

The electric field inside the Nichrome wire can be calculated using Ohm's law:

V = IR
where V is the voltage (1.7 V), I is the current, and R is the resistance of the wire. The resistance of a wire is given by:

R = ρL/A

where ρ is the resistivity of the material (for Nichrome, it is 1.10 x 10^-6 Ωm), L is the length of the wire (88 cm = 0.88 m), and A is the cross-sectional area of the wire (πd^2/4, where d is the diameter of the wire). Plugging in the values:

R = (1.10 x 10^-6 Ωm)(0.88 m) / (π(0.25 x 10^-3 m)^2 / 4) = 11.18 Ω

From Ohm's law:

I = V / R = 1.7 V / 11.18 Ω = 0.152 A

The electric field inside the wire can then be calculated using the equation:

E = V / L

where L is the length of the wire. Plugging in the values:

E = 1.7 V / 0.88 m = 1.93 V/m

For the wire with the same length and diameter but with electron mobility 4 times as large as that of Nichrome, the resistivity of the material will be different. However, since the mobile electron density is the same, the resistance of the wire will remain the same. Therefore, using the same calculations as above, the electric field inside the wire will also be the same:

E = 1.93 V/m.

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Answer: The answer is 120 Newton.

Answer:

distance travelled is 80

When the volume of a container is doubled while the temperature remains constant, the entropy of the gas increases by R * ln(2).

In an isothermal process, the entropy change of an ideal gas can be calculated using the formula ΔS = nR * ln(V2/V1), where ΔS is the change in entropy, n is the number of moles, R is the universal gas constant, and V2 and V1 are the final and initial volumes, respectively.

In this case, V2 = 2V1. Since the number of molecules is given as 6.5 × 10^22, we first need to convert it to moles using Avogadro's number (6.022 × 10^23 molecules/mol).

The number of moles, n = (6.5 × 10^22) / (6.022 × 10^23) = 0.108 moles. Plugging these values into the formula, we have ΔS = 0.108R * ln(2).

Summary: When the volume of a container with a gas is doubled while the temperature remains constant, the entropy of the gas increases by approximately 0.108R * ln(2).

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To ensure maximum reflectance of normally incident 530 nm wavelength light in a soap bubble with an index of refraction of 1.33, the minimum thickness of the bubble can be calculated using the formula for the thickness of a thin film that exhibits maximum reflectance:

t = (m + 0.5)λ / (2 * n)

Where:
t = thickness of the film
m = an integer (0, 1, 2, ...)
λ = wavelength of the incident light (530 nm)
n = refractive index of the film (1.33)

Plugging in the values, we get:

t = (m + 0.5) * 530 nm / (2 * 1.33)

To find the minimum thickness that ensures maximum reflectance, we can use the smallest value of m, which is 0. Thus, the minimum thickness is:

t = (0.5) * 530 nm / (2 * 1.33) = 99.62 nm

Therefore, a soap bubble with a minimum thickness of 99.62 nm will ensure maximum reflectance of normally incident 530 nm wavelength light.


1. Recall that maximum reflectance occurs when the optical path difference between the reflected rays is equal to an odd multiple of half the wavelength. This can be represented as:
  (2 * thickness * index of refraction) = (2n + 1) * (wavelength / 2)

2. For minimum thickness, we will use n = 0:
  (2 * thickness * 1.33) = (2(0) + 1) * (530 nm / 2)

3. Solve for thickness:
  thickness = (1 * 530 nm) / (2 * 1.33)

4. Calculate the value:
  thickness ≈ 199.25 nm

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R=10+15+30

55 is the answer to the question

Potential contamination or changes in the atmospheric carbon-14 levels over time can affect the accuracy of the age estimation. To determine the age of the fire pit, we need to use the concept of the half-life of carbon-14 and its decay equation.

The half-life of carbon-14 is 5,730 years, which means that after 5,730 years, half of the carbon-14 in a sample will have decayed.

Carbon-14 dating relies on measuring the activity of carbon-14 in a sample. The activity is given in becquerels (Bq), which represents the number of radioactive decays per second.

Given that the carbon-14 activity of the charcoal from the fire pit is 0.121 Bq per gram of carbon, we can use this information to determine the age of the fire pit.

First, we need to convert the carbon-14 activity into a decay constant. The decay constant (λ) can be calculated using the formula:

λ = ln(2) / half-life

λ = ln(2) / 5730 years (using the half-life of carbon-14)

Next, we can use the decay equation to find the age of the fire pit. The decay equation is given by:

N(t) = N₀ * e^(-λt)

where N(t) is the current amount of carbon-14, N₀ is the initial amount of carbon-14, λ is the decay constant, and t is the time in years.

We can rearrange the equation to solve for t:

t = -ln(N(t) / N₀) / λ

Given that the current activity (N(t)) is 0.121 Bq/g and assuming the initial activity (N₀) was higher (as carbon-14 decays over time), we can estimate an initial activity and calculate the age:

N₀ = 10 * N(t) (assuming an initial activity that is roughly ten times higher)

t = -ln(0.121 Bq/g / (10 * 0.121 Bq/g)) / λ

Now we can calculate the age using the above equation.

Please note that this calculation assumes certain simplifications and approximations. Additionally, other factors such as potential contamination or changes in the atmospheric carbon-14 levels over time can affect the accuracy of the age estimation. Advanced techniques and further analysis are often employed in radiocarbon dating to obtain more precise results.

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Answer:

This question is incomplete

Explanation:

This question is incomplete because of the absence of the figure. However, wavelength can be described as the distance between two crests (identical points) of a wave (as illustrated in the picture attached). Thus, a wave with a large/great wavelength must have a long distance between the two crests and has nothing to do with the number of crests/wavelengths since distance between crests could also be small.

Hence, what appears to be the correct option is the last option (Wavelength shown with 1 wavelength stretched over a long distance).

Answer:

Its B.

Explanation:

Im took the exam.

Answer:

The answer is B

Explanation: