A 31.7 kg kid, initially at rest, slides
down a frictionless water slide at 53.2º.
How fast is she moving 3.45 s later?

For LCR circuit, the Resonant frequency is 212.68kHz.

Given LCR circuit has L= 1 mH, C= 560pf

f=1/{2*22\7*√[1×10^(-3)H]*√[56*10^(-12)F]

f=212.68kHz

About Resonance frequency:

Equation f = 1 / [2π×√(LC)] can be used to calculate the resonant frequency of the RLC circuit, where:

The frequency at which the transfer function reaches its highest value is known as the resonant frequency of an electrical system. Consequently, the greatest output for a given input can be obtained. It has been demonstrated that resonance occurs when the values of the capacitive and inductive impedances are equal.

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Graph showing wave displacement versus time at a specific point in space is called a D) Line graph

A line graph is a form of a graph in which data points are connected by lines, with the horizontal axis denoting time and the vertical axis denoting wave displacement or any other pertinent parameter. When referring to waves, the term "wave displacement" describes how far a particle in the medium is from its equilibrium position at various times in time.

The behavior of waves over time is frequently represented by line graphs, which lets us see how the wave displacement changes over time. The pattern, frequency, and amplitude of the wave can be seen by graphing the displacement of the wave at various time intervals.

The wave displacement's relationship to time is depicted in a straightforward and visual manner by the line graph. It demonstrates the oscillatory nature of the wave and enables us to examine its properties, including wavelength, period, and phase.

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Physical quantities which needs only magnitude to express itself, and doesn't need any specific direction.

Example - Speed, Distance, time, mass, and so on.

Physical quantities which needs magnitude as well as direction to express itself, and follows vector law of addition.

Example - force, acceleration, velocity, and so on.

The height of the cliff is 30 m.

Between distance/height, speed and time can be understood as follows.

The formula for distance/height is speed times time or written

s = (v) (t)

The formula for time is distance divided by speed or written

t = s ÷ v.

v is the symbol for speed (velocity),

s is the distance,

and t is the time.

The formula for speed is distance divided by time or written v = s ÷ t.

To determine the height of the cliff, use the equation:

S = (v) (t)

We have,

Speed of object thrown from the cliff = 10 m/s ⇒ (v)

The time it takes the object to hit the ground = 3 s ⇒ t

So, the height of the cliff is:

S = (10) (3)

= 30 m

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Answer:fda

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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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b. The block is at maximum positive displacement from the equilibrium point.

In an oscillator consisting of a spring and a block, the kinetic energy reaches its maximum when the block is at maximum positive displacement from the equilibrium point. This occurs when the block has moved the farthest distance away from the equilibrium position in the positive direction.

At maximum displacement, the spring is stretched or compressed to its maximum extent, storing potential energy. As the block starts to move back towards the equilibrium position, this potential energy is gradually converted into kinetic energy. At the equilibrium position, the block momentarily comes to a rest and has zero kinetic energy. As the block continues its motion towards the opposite maximum displacement, the kinetic energy increases until it reaches its maximum at maximum positive displacement.

Therefore, option b, "The block is at maximum positive displacement from the equilibrium point," is the correct answer.

In an oscillator with a spring and a block, the kinetic energy reaches its maximum when the block is at maximum positive displacement from the equilibrium point. This is the point where the block has moved the farthest away from the equilibrium position in the positive direction.

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The resistance of the electric heating element can be determined using Ohm's law, which states that resistance (R) is equal to voltage (V) divided by current (I). In this case, the voltage across the element is given as 232 volts and the current flowing through it is 19 amperes. The correct option is 12 ohms.

Applying Ohm's law, we calculate the resistance as:

R = V / I

R = 232 volts / 19 amperes

R ≈ 12 ohms

Therefore, the resistance of the element is approximately 12 ohms. This means that for every ampere of current flowing through the element, there is a voltage drop of 12 volts. The resistance value of 12 ohms indicates that the element has a moderate level of electrical resistance, which allows it to generate heat efficiently when current flows through it. Thus, the correct option is 12 ohms.

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Answer:

I think it's 18 newtons.

Explanation:

Answer:
That the object is either at rest or moving with constant velocity.

Explanation:

Newton’s 1st Law of Motion tells us how an object behaves if the net force acting upon an object is equal to zero. An object at rest wants to stay at rest (or, an object in motion wants to stay in uniform motion) unless acted upon by an unbalanced force. Knowing this knowledge of Newton’s first law, if some one were to tell us that the net forces acting upon an object added to zero, we can conclude that, without seeing the object, that the object is either at rest or moving with constant velocity.

The thinnest film of magnesium fluoride that can limit the reflection of 550-nm light is approximately 9.821 × 10^-7 m or 982.1 nm.

The thinnest film of magnesium fluoride that can limit the reflection of 550-nm light can be calculated using the concept of thin film interference. The formula for the minimum thickness of the film is given by t = (λ / 4) / (n - 1), where t is the thickness of the film, λ is the wavelength of light, and n is the refractive index of the film material.

In this case, the film is designed to limit the reflection of 550-nm light. Therefore, λ = 550 nm = 5.5 × 10^-7 m. The refractive index of magnesium fluoride is given as 1.38, and the refractive index of glass is 1.52.

Using the formula, the minimum thickness of the magnesium fluoride film can be calculated as follows:

t = (5.5 × 10^-7 m / 4) / (1.38 - 1.52)

  = (1.375 × 10^-7 m) / (-0.14)

  ≈ -9.821 × 10^-7 m

Therefore, the thinnest film of magnesium fluoride that can limit the reflection of 550-nm light is approximately 9.821 × 10^-7 m or 982.1 nm.

The explanation behind this is based on the principles of interference of light waves. When light passes through a thin film, some of the light reflects from the upper surface of the film and some from the lower surface.

These reflected waves can interfere constructively or destructively, depending on the thickness of the film and the wavelength of the light. In the case of destructive interference, the reflected waves cancel each other out, resulting in minimal reflection.

To achieve this, the thickness of the film needs to be such that the reflected waves from both surfaces are exactly out of phase and interfere destructively.

The formula mentioned earlier, t = (λ / 4) / (n - 1), calculates the minimum thickness required for destructive interference. By using the given values of λ (550 nm) and the refractive index of magnesium fluoride (1.38), we can calculate the minimum thickness to be approximately 982.1 nm.

Coating lenses with this thin film of magnesium fluoride helps reduce reflections and improve image clarity in sophisticated cameras, ensuring that the maximum amount of light is transmitted through the lens rather than being reflected away.

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Answer:

Momentum = 2qEx/v

Explanation:

From the work - energy theorem, we know that;

Kinetic energy = work done

Now, formula for both are;

Kinetic energy = ½mv²

Work done = qEx

Where;

m is mass

v is velocity

q is charge

E is Electric field

x is distance covered.

Thus;

½mv² = qEx - - - - (eq 1)

Now, momentum formula is;

p = mv

Let's rewrite the left hand side of equation 1 to reflect p = mv. Thus;

½v(mv) = qEx

½vp = qEx

p = 2qEx/v

A particular automobile with an initial speed of 65 km/h will come to 120 km/h in 8.49 s

The formula for Uniformly varied rectilinear motion (UVRM) and procedure we will use to solve this exercise is:

t = (vf - vi) /a

Where:

Information about the problem:

By converting the velocity from km/h to m/s, we get:

65 km/h * (1000 m / 1 km) * (1 h / 3600 s) = 18.056 m/s

120 km/h * (1000 m / 1 km) * (1 h / 3600 s) = 33.33 m/s

Applying the time formula, we have:

t = (vf - vi) /a

t = (33.33 m/s - 18.056 m/s) / 1.8 m/s2

t = 15.274 m/s /  1.8 m/s2

t =  8.49 s

It is a physical quantity that indicates the variation of velocity as a function of time, it is expressed in units of distance per time squared e.g.: m/sec2 ; km/h2

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Answer:

60m

Explanation:

SInce we know S=d/t, plug in known values and solve

20m/s=d/3s

20m/s*3s=d

d=60m

Hi There, Buddy!

To solve this problem, let us divide the entire motion into 2 phases

1.) When the elevator is moving with an acceleration

2.) When the elevator has a deceleration

For the first half -

u = 0 , a = 0.6 , t = t1

v = 0.6(t1)  ---------- ( 1 )

s = 1/2 x 0.6 x (t1)^2 = 0.3(t1^2) -------- ( 2 )

For the second half -

u = 0.6(t1) , a = -0.8 , v = 0

0.6 x (t1) = 0.8 (t2) ----> 3(t1) = 4(t2) ---------- ( 3 )

0.36(t1)^2 = 1.6 s2 ---------- ( 4 )

Now, we know that the total time taken is 10 seconds

------- t1 + t2 =10 , 3t1 = 4t2 ---- t1 = 40/7 , t2 = 30/7

Now, substitute values of t1 and t2 in s1 and s2 and add both s1 and s2 to get total distance travelled.

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BGMI Interactive is an educational tool that allows students to learn about Earth's geological history and the different events that have occurred over time. One of the features of BGMI Interactive is the Return to EarthViewer option, which allows users to explore different time periods and learn about the causes of mass extinctions.

By clicking on each mass extinction in Return to EarthViewer, users can find out more about the causes of these events. Some of the factors that have been identified as contributing to mass extinctions include climate change, volcanic eruptions, asteroid impacts, and changes in ocean chemistry.

For example, the mass extinction that occurred at the end of the Permian period (about 252 million years ago) is thought to have been caused by a combination of factors, including massive volcanic eruptions that released large amounts of carbon dioxide into the atmosphere and led to a warming of the planet. This, in turn, caused widespread changes in ocean chemistry, leading to the extinction of many marine species.

Similarly, the mass extinction that occurred at the end of the Cretaceous period (about 66 million years ago) is thought to have been caused by a large asteroid impact, which triggered massive wildfires and a global cooling event that led to the extinction of the dinosaurs and many other species.

Overall, the causes of mass extinctions are complex and varied, and understanding these events can help us to better understand the history of life on Earth and the ways in which our planet has changed over time.

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Answer:

1:a

2:c

3:f

4:d

5:f or e

6:d

Explanation:

Hope it helps! also if im wrong sorry. but i already learned this so yeah have a nice day!

Answer:

no the moon does not rotate it only goes in circle just like the sun so I disagree with your friend

Answer:

A. That enough light of any frequency would cause electrons to flow.

Explanation:

A P E X

Scientists using classical, Newtonian physics expect to observe the photoelectric effect because enough light of any frequency would cause electrons to flow.

When a medium receives electromagnetic radiation, electrostatically charged particles are emitted from or inside it.

The emission of ions from a steel plate when light falls on it is a common definition of the effect. The substance could be a solid, liquid, or gas; and the released particles could be protons or electrons.

Scientists using classical, Newtonian physics expect to observe the photoelectric effect because enough light of any frequency would cause electrons to flow.

The flow of the electron is a must to understand the photo electric effect.

Hence option A is correct.

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Answer:

Convex lenses concentrates the light energy to one spot on the paper so that the heat energy accumulates on that one small spot of paper. ... As the heat increases, combustion will occur when the spot becomes too hot and the paper will burn.

Explanation:

Hope it helps!

If you dont mind can you please mark me as brainlest?

 The average kinetic energy of CO2 molecules with a root-mean-square speed of 629 m/s is 49.4 kJ/mol.

The   thermodynamics root-mean-square (rms) speed of gas molecules is a measure of their average speed and is related to their kinetic energy. The kinetic energy of a gas molecule is proportional to the square of its speed.

Therefore, the rms speed can be used to calculate the average kinetic energy of the gas molecules. In this case, we are given the rms speed of CO2 molecules as 629 m/s. Using this value, we can calculate the average kinetic energy of CO2 molecules using the formula:

average kinetic energy = 1/2 * m * (rms speed)^2

where m is the molar mass of CO2, which is 44.01 g/mol. Converting this to kg/mol and substituting the values, we get:

average kinetic energy = 1/2 * (0.04401 kg/mol) * (629 m/s)^2 = 49.4 kJ/mol

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The undesirable condition you are referring to is called "islanding" in the context of power systems. Islanding occurs when an interactive inverter.

Typically used in distributed energy resources (such as solar panels or wind turbines), continues to supply power to the utility grid during a utility outage.

In normal operation, an interactive inverter synchronizes its output with the utility grid, matching the grid's voltage and frequency. This synchronization is crucial for safety and stability. However, when a utility outage occurs, the interactive inverter should disconnect from the grid to avoid the risk of energizing lines being worked on by utility personnel.

If an interactive inverter fails to detect the utility outage and continues to supply power to the grid, it creates an "island" within the grid. This island can be dangerous for utility workers repairing the grid, as they may assume the lines are de-energized when, in fact, power is still being supplied.

To prevent islanding, grid-tied inverters are required to have anti-islanding protection mechanisms. These mechanisms continuously monitor the grid's voltage and frequency. If they detect a deviation beyond a certain threshold, indicating a utility outage, they quickly disconnect the inverter from the grid, ceasing power injection.

Islanding protection is essential to ensure the safety of utility workers and prevent damage to the grid. It is an important consideration in the design and operation of distributed energy resources connected to the utility grid.

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The acceleration is the same, if the initial velocity is the same, the times of going up and down are the same.

If the initial velocity is the same for both processes, the acceleration is the same and the times are the same.

The relationship between the net force, the masses, and the acceleration of the bodies is established by Newton's second law.  

∑ F = m a

In the image of the block moving up and down the ramp in the attached, a free-body can be observed; in this example, the x-axis is parallel to the ramp and the y-axis is perpendicular. The reference system is a coordinate system with respect to which the forces are depicted.

Sinθ =  Wₓ/W

Cosθ =  W_y/W

Wₓ = WSinθ

W_y = Wcosθ  

Newton's second law for each axis.

Case 1. Block slides down on x-axis

Wₓ = ma

mg sinθ = ma

a = g sin θ

Case 2. Block rises

X-axis

- Wₓ = m a

- mgsin θ = a

a = - g sin θ

Acceleration is equal in both cases, if the block has the same initial speed, the rise and fall time is the same.

y = v₀ t - ½ a t²

y = ½ a t²

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Your question is incomplete, most probably the full question is this:

(b) The block takes time tup to slide up the ramp a distance x The block then takes time down to slide back down to the bottom of the ramp, where it has speed up. Is flows greater than equal to

or less tup?

tdown >tup -tdown = tup .tdown In a clear, coherent paragraph-length response that may also contain figures and/or equations, explain your reasoning. If you need to draw anything other than what you have shown in part (a) to

assist in your response, use the space below. Do NOT add anything to the figures in part (a).

The correct option is (c). electrical grid that could be made much more energy efficient.

While the US electrical grid is extensive and reliable, it is also quite old and inefficient in some ways.

Some parts of the grid have been in operation for over a century, and a significant portion of the grid infrastructure needs to be upgraded or replaced to improve energy efficiency.

In recent years, there has been a growing effort to modernize the US electrical grid and make it more efficient and sustainable.

This includes investments in new technologies like smart grids, renewable energy sources, and energy storage systems, as well as upgrades to existing infrastructure.

While progress has been made, there is still a long way to go to make the US electrical grid truly smart and energy-efficient.

The challenge lies in upgrading the existing infrastructure while maintaining reliability and affordability for consumers, which requires a significant investment of resources and careful planning.

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20 - 5 = 15

total displacement = 15 meters

Standard sea-level pressure, by definition, equals 760 mm (29.92 inches) of mercury, 14.70 pounds per square inch, 1,013.25 × 103 dynes per square centimetre, 1,013.25 millibars, one standard atmosphere, or 101.325 kilopascals.

The frequency of electromagnetic waves is 22.32 x 10⁹ Hz or 22.32 GHz.

We need to know about electromagnetic waves to solve this problem. Electromagnetic waves can propagate without media. The speed of electromagnetic in vacuum media is equal to the speed of light. Hence, the wavelength and frequency can be determined as

c = λ . f

where c is the speed of light (3 x 10⁸ m/s), λ is wavelength and f is frequency.

From the question above, we know that

λ = 13.44 mm = 0.01344 m

By substituting the given parameter, we can calculate the frequency of microwaves

c = λ . f

f = c / λ

f = 3 x 10⁸ / 0.01344

f = 22.32 x 10⁹ Hz

f = 22.32 GHz

Hence, the frequency of radiowaves is 22.32 x 10⁹ Hz or 22.32 GHz.

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A wave is a disturbance that travels from one point to another in a medium. This disturbance can also be referred to as variation in energy. Light consists of energy derived from oscillating magnetic and electric fields. As light moves, it carries this energy from the source to another location. Also, waves have frequency and wavelength. Given these characteristics of light, we can conclude that

light is a kind of wave

Answer:

2,450

400

Explanation:

Pls brainliest me