Which device is not used to effectively fly lower more stable approach speeds?
a. Winglets
b. Vortex Generators
c. Boundary Layer Control
d. Trailing Edge Flaps
e. None of the above

ANSWER:

7 m/s

STEP-BY-STEP EXPLANATION:

Given:

Initial velocity (u) = 4 m/s

Acceleration (a) = 1.5 m/s^2

Time (t) = 2 s

We can calculate the final velocity using the following formula:

We replace and calculate the value of the final velocity:

The final velocity is equal to 7 m/s.

The qualities that help reduce drag are sleek body, V-shaped flight, and aerodynamic design. The correct option is D.

A dolphin's sleek shape lowers drag by minimising the surface area exposed to the water, allowing it to travel through the water more easily.

During long migratory journeys, birds' V-shaped flight reduces drag by taking advantage of the aerodynamic benefits of flying in formation, where each bird can benefit from lower air resistance by flying slightly behind and to the side of the bird in front.

Aeroplanes are similarly constructed with narrow wings and a rounded tip to reduce drag by minimising air resistance and providing smooth airflow over the aircraft's surface.

These characteristics work together to reduce drag and improve overall locomotor efficiency.

Thus, the correct option is D.

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To find the Fourier series representation of the periodic function v(t) defined by v(t) = 6(t - 2n)[u(t - 2n) - u(t - 2n - 2)], where n belongs to the natural numbers and v(t) is zero for t < 0, we can use the following steps:

Determine the fundamental period of v(t): In this case, the function v(t) has a period of 2. This means that v(t) repeats itself every 2 units of time.

Express v(t) as an odd periodic function: We can rewrite v(t) as v(t) = 6(t - 2n)[u(t - 2n) - u(t - 2n - 2)] = 6(t - 2n)u(t - 2n) - 6(t - 2n)u(t - 2n - 2). Since u(t) is the unit step function, u(t) - u(-t) is an odd function.

Calculate the Fourier series coefficients: For an odd periodic function, the Fourier series coefficients can be obtained using the formula:

cn = (1/T) * ∫[0 to T] v(t) * sin((2πn/T)t) dt

Since the fundamental period T is 2 in this case, the coefficients can be calculated as:

cn = (1/2) * ∫[0 to 2] v(t) * sin((2πn/2)t) dt

= (1/2) * ∫[0 to 2] v(t) * sin(πnt) dt

We need to evaluate this integral separately for the two terms of v(t).

For the first term, 6(t - 2n)u(t - 2n), the integral will be non-zero only when t is in the range [2n, 2n + 2]. Thus, the integral can be written as:

cn1 = (1/2) * ∫[2n to 2n+2] 6(t - 2n) * sin(πnt) dt

Similarly, for the second term, 6(t - 2n)u(t - 2n - 2), the integral will be non-zero only when t is in the range [2n+2, 2n + 4]. Thus, the integral can be written as:

cn2 = (1/2) * ∫[2n+2 to 2n+4] 6(t - 2n) * sin(πnt) dt

Finally, the Fourier series representation of v(t) can be written as:

v(t) = ∑[n = -∞ to +∞] (cn1 - cn2) * sin(πnt)

Note that the actual calculations of the Fourier series coefficients require evaluating the integrals, which may result in specific values depending on the value of n.

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As shoes are worn down, there is a decrease in the coefficient of friction, that increases the risk of injury from a slip and fall for the one wearing it

Wearing off shoes decreases the coefficient of friction that increases the risk of slip.

Rubber-soled shoes on a concrete surface can generate a coefficient of friction over 1.0µ. Generally, a coefficient of friction of 0.4µ to 0.5µ is considered a good traction offering.

One of the easiest and do-it-yourself ways to make shoes slip-resistant is to scuff the soles with sandpaper, a nail file, or with any rough surface, such as brick, gravel or rock. You have to simply rub the rough item on the sole of your shoe until small grooves appear.

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Answer:

0.4m/s

Explanation:

It is given speed so it is scalar.

distance covered in 1 round = 180m

therefore, distance covered in 4 rounds = 180*4 = 720m

time = 30 mins = 30*60 = 1800 seconds

average speed = total distance/total time taken

= 720/1800

= 0.4m/s

EAC( Low-energy lightbulb )=18.47 EAC( Conventional lightbulb )=7.33 Conventional lightbulb is cheaper to operate. Option D

To calculate the Equivalent Annual Costs (EAC), we need to consider the initial cost, maintenance costs, and the present value of future costs, taking into account the discount rate.

The EAC (Equivalent Annual Cost) is calculated by summing up the annual costs of the lightbulb over its lifetime, discounted at the real discount rate of 4%.

For the low-energy lightbulb:

EAC = Cost of bulb + Present value of annual electricity cost

= $3.60 + ($2.00 / (1 + 0.04)^1) + ($2.00 / (1 + 0.04)^2) + ... + ($2.00 / (1 + 0.04)^9)

≈ $18.47

For the conventional lightbulb:

EAC = Cost of bulb + Present value of annual electricity cost

= $0.60 + ($7.00 / (1 + 0.04)^1) + ($7.00 / (1 + 0.04)^2) + ... + ($7.00 / (1 + 0.04)^1)

≈ $7.33

Since the EAC for the low-energy lightbulb is $18.47 per year and the EAC for the conventional lightbulb is $7.33 per year, the conventional lightbulb is cheaper to operate assuming a burnt-out bulb is replaced by an identical bulb.

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Answer: \(2666.67 \text{ (or in 2 sigfigs, }2.7\times10^{3})\)

Explanation: \(1\text{ }\dfrac{\text{N}}{\text{m}^2} = 1 \text{ Pa}\\\\P=\dfrac{F}{A}\\\\P=\dfrac{800\text{ N}}{0.3\text{ m}^2} = 2666.\overline6 \text{ N/m}^2 \approx 2666.67 \text{ Pa} \approx 2.7 \text{ kPa}\)

Don't know if you need to convert to other units but typically in physics it's left as N/m^2 or Pa.

Answer:

The temperature  change in the calorimeter will be lower

Explanation:

Water is an example of a molecular substance. They have relatively low melting points and boiling points usually below 300° C . Water reacts with metals to a degree varying with their position in the electrochemical series.

The specific heat of water is 4179.6 Joules which is relatively high . This typically implies that water absorbs a larger amount of heat but the increase in temperature of its boiling points is relatively low. Thus; in the 200-mm test tube that contains water and was subsequently added to the calorimeter , the heat present was initially absorbed by the water and that does not result to an increase in the temperature change in the calorimeter. Thus the temperature change in the calorimeter will be lower.

Answer:

Meteoroids are objects in space that range in size from dust grains to small asteroids. Think of them as “space rocks." When meteoroids enter Earth's atmosphere (or that of another planet, like Mars) at high speed and burn up, the fireballs or “shooting stars” are called meteors.

Explanation:

thx to the internet

The temperature at which a line intersects the x-axis can be determined by setting the dependent variable to zero and solving the equation, while the corresponding volume can be found by substituting the temperature back into the equation and solving for the volume.

In general, when a line intersects the x-axis, it means that the dependent variable (usually represented on the y-axis) has a value of zero.

To find the temperature at which this occurs, we need to identify the equation or relationship between temperature and another variable.

Once we have the equation, we can set the dependent variable (usually volume in this case) equal to zero and solve for the temperature. This will give us the temperature at which the line intersects the x-axis.

To determine the corresponding volume, we substitute the temperature value obtained from the previous step back into the equation and solve for the volume. This will give us the volume corresponding to the temperature at which the line intersects the x-axis.

It's important to note that without specific information about the equation or relationship, we cannot provide numerical values for the temperature or volume.

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As the balls reach their maximum displacement, their kinetic energy reaches a minimum.  a maximum zero neither a maximum nor zero. This is because, at the maximum displacement point, the balls have come to a momentary stop and are changing direction, therefore their velocity is momentarily zero.

As kinetic energy is inversely related to the mass and velocity of an object, it will be zero if the velocity is zero. The balls' velocity and kinetic energy will rise once more when they start to move in the other direction. As a result, the kinetic energy is not at its greatest or its minimum at the moment of maximum displacement, but rather it is there.

The balls' kinetic energy depletes when they approach their maximum displacement. The balls' velocity is zero when they have reached their maximum displacement because they briefly stop traveling before turning in a new direction. A velocity of 0 yields zero kinetic energy because kinetic energy is computed as (1/2)mv2, where m represents mass and v is velocity.

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Answer:

(a) The total weight of the climber is equal to her mass multiplied by the acceleration due to gravity. Therefore, W = mg = 62 kg x 10 m/s^2 = 620 N.

(b) The two conditions needed for equilibrium are that the net force acting on the climber is zero and the net torque acting on the climber is zero.

(c)(i) The moment about her feet due to her weight is equal to the weight of the climber multiplied by the distance between her feet and the cliff. Therefore, M = W x d = 620 N x 0.9 m = 558 Nm.

(ii) To determine the tension in the rope, we need to resolve the forces acting on the climber in the horizontal and vertical directions. In the horizontal direction, the tension in the rope is balanced by the force of friction between the climber's feet and the cliff. Therefore, T = F.

In the vertical direction, the climber's weight is balanced by the normal force of the cliff and the tension in the rope. Therefore, N + Tcos(60) = W.

Since the climber is in equilibrium, the net torque acting on her must be zero. Therefore, the torque due to the tension in the rope must be equal and opposite to the torque due to the climber's weight. Therefore, Tsin(60) x 1.2 = M.

Substituting the values we have, we get:

N + Tcos(60) = W

Tsin(60) x 1.2 = M

Solving for T, we get:

N = W - Tcos(60) = 620 N - T(0.5)

Substituting this into the second equation, we get:

Tsin(60) x 1.2 = M

Tsin(60) = M / 1.2 = 558 Nm / 1.2 m = 465 N

Substituting this value of T into the first equation, we get:

N = 620 N - T(0.5) = 620 N - 465 N(0.5) = 388 N

Therefore, the tension in the rope is 465 N and the normal force of the cliff on the climber is 388N

Answer:

it can kill you cell and win you kill you no cell no life

Explanation:

Answer:

Our bodies are designed to deal with the low levels we're exposed to everyday due to evolution. But, too much radiation can damage tissues by changing cell structure and damaging DNA.  

Explanation:

This can cause serious health problems, including cancer.

Explanation:

The relationship among u, v, and f in the context of a lens can be described by the lens formula:

1/v - 1/u = 1/f

where:

- u is the object distance (distance between the object and the optical center of the lens),

- v is the image distance (distance between the image and the optical center of the lens), and

- f is the focal length of the lens.

According to the lens formula, the reciprocal of the image distance subtracted from the reciprocal of the object distance is equal to the reciprocal of the focal length.

According to the given statement, the coefficient of friction between the block and the surface is approximately 0.000772.

The coefficient of friction is a measure of the interaction between two surfaces in contact. It represents the amount of resistance or friction between the surfaces. In the given problem, we need to find the coefficient of friction between the block and the surface.

To find the coefficient of friction, we can use the equation:

μ = (k * x) / (m * g)

where:
- μ is the coefficient of friction
- k is the stiffness constant of the spring
- x is the distance the spring is compressed
- m is the mass of the block
- g is the acceleration due to gravity (approximately 9.8 m/s²)

Given values:
- k = 500.0 N/m
- x = 5.0 cm = 0.05 m
- m = 3.3 kg

First, let's convert the distance x to meters by dividing it by 100:
x = 0.05 m

Now, we can substitute the given values into the equation:

μ = (500.0 N/m * 0.05 m) / (3.3 kg * 9.8 m/s²)

Calculating this expression:

μ = 0.025 / 32.34

μ ≈ 0.000772

Therefore, the coefficient of friction between the block and the surface is approximately 0.000772.

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Answer: Prize for Physics

Explanation: Together with her husband, she was awarded half of the Nobel Prize for Physics in 1903, for their study into the spontaneous radiation discovered by Becquerel, who was awarded the other half of the Prize. In 1911 she received a second Nobel Prize, this time in Chemistry, in recognition of her work in radioactivity.

In 1903, Marie Curie became the first woman to win a Nobel Prize in the field of physics. She was awarded the prize alongside her husband, Pierre Curie, and Henri Becquerel for their research on radioactivity.

Marie Curie's contributions to the study of radioactivity were groundbreaking and she continued to make significant advancements in the field, leading to her second Nobel Prize win in 1911, this time in chemistry. She remains the only person to have won Nobel Prizes in multiple sciences. Curie's work has had a lasting impact on scientific research and paved the way for future discoveries. Despite facing discrimination as a woman in the male-dominated field of science, she persevered and made significant contributions to the scientific community. Today, Marie Curie is remembered as a trailblazer and a pioneer in the study of radioactivity, and her legacy continues to inspire future generations of scientists.

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The rotational kinetic energy when she pulls in her arms is 0.7 joule.

We need to know about kinetic energy to solve this problem. Kinetic energy is the energy from a moving object. It can be determined as

KE = 1/2 . I . ώ²

where KE is kinetic energy, I is the moment of inertia and ώ is the angular speed.

From the question above, we know that

ώ = 1 rad/s

I = 1.4 kgm²

Let's assume that the angular velocity does not change. The kinetic energy should be

KE = 1/2 . I . ώ²

KE = 1/2 . 1.4 . 1²

KE = 0.7 joule

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The diagram that represents the directions of the velocity, v, and acceleration, a, of a toy car as it moves in a clockwise, horizontal, circular path at a constant speed is Diagram B.

In a circular motion, the velocity is always tangential to the circular path, while the acceleration is always directed towards the center of the circle. This means that the velocity and acceleration are always perpendicular to each other.

In Diagram B, the velocity is shown as a vector pointing in the tangential direction to the circular path, while the acceleration is shown as a vector pointing towards the center of the circle. This is the correct representation of the directions of the velocity and acceleration of a toy car moving in a clockwise, horizontal, circular path at a constant speed.

Therefore, the correct answer is Diagram B

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the light ray will be refracted towards the normal.

Answer:

Torque is the rotational equivalent of linear force. Torque is the engine's rotational force.

Hope this helps..

Explanation:

Answer:

ballance

i just took the quiz

To develop a sampling plan for LSI circuit chips, an electronics firm should consider the AQL (Acceptable Quality Level) of 0.15 specified by the LSI manufacturing department and the LTPD (Lot Tolerance Percent Defective) of 0.40 acceptable by the assembly department.

The sampling plan should involve selecting a representative sample of LSI circuit chips from the manufacturing department and conducting tests to determine their quality. The AQL of 0.15 means that the manufacturing department will tolerate no more than 15% defective chips in a given sample. Therefore, the sampling plan should ensure that the sample size is large enough to provide statistical confidence in determining the quality level of the chips.

The assembly department's LTPD of 0.40 indicates the maximum allowable defective rate for the chips after assembly. This implies that the sampling plan needs to consider the overall quality of the chips and their performance in the final analog devices.

To execute the sampling plan, one could follow these steps:

1. Determine the appropriate sample size based on statistical calculations, taking into account the desired confidence level and the acceptable quality levels specified by both departments.

2. Randomly select the required number of LSI circuit chips from the manufacturing department.

3. Perform thorough testing and inspection on the selected chips to identify any defects or anomalies.

4. Calculate the defect rate based on the number of defective chips found in the sample.

5. Compare the defect rate with the specified AQL and LTPD to assess if the chips meet the required quality standards.

6. Provide feedback to the manufacturing and assembly departments based on the results, taking necessary actions if the quality standards are not met.

By following this sampling plan, the electronics firm can ensure that the LSI circuit chips meet the required quality standards and are suitable for use in analog devices.

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Answer:

70

Explanation:

right...

Answer:

120

………………..........................................

No atomic  model is a picture of an atom but only helps explain the behavior of one

We know that the atom is the smallest particle of a substance that is able to take part in a chemical reaction. We know that in the atom there are certain smaller particles that we can be able to refer to as the subatomic particles.

In this case, we are talking about the different models that we can be able to use to show the atom. None of these models can be said to show the atom exactly but can approximate how the atom behaves.

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Answer:

Calculating the question of whether or not to take it serious

In two-dimensional motion in the x-y plane, the x part of the motion is independent of the y part of the motion. the correct option is B The x part of the motion is independent of the y part of the motion.

This is because the x and y directions are perpendicular to each other, and the motion in one direction does not affect the motion in the other direction. Therefore, the motion of an object in the x-direction can be analyzed separately from its motion in the y-direction.

The x and y components of motion are related to each other through trigonometric functions such as sine and cosine. For example, if an object is moving at an angle θ to the x-axis with a speed of v, then its x and y components of velocity are given by:

vx = v cos(θ)
vy = v sin(θ)

In this case, the x and y components of motion are dependent on the angle θ, which determines the direction of motion.

The correct option is B.

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We expect the last colour of the sunset to be on the red end of the visible spectrum because of the dispersion of light.  Due to the particles present in the atmosphere, the light rays undergo scattering and the light of shorter wavelengths like blue gets dissipated but light rays of longer wavelengths travel long distances without getting dissipated.

Dispersion of light is the phenomenon in which the light from the sun is split into its constituent colours which are Violet, Indigo, Blue, Green, Yellow, Orange, and Red when it passes through a prism or due to the particles present in the earth's atmosphere.  

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Answer:

m - 200 kg

ti - 0⁰c

clF - 79,7kcal, kg ( calor latente de fusión)

pf - 0⁰c

formulas:

QL- cL.m

solución - Ap camosla ecqación.

QL- (79,7 kcal,kg) .200 kg

Resultado ,la cantidad de calor absorbe lamasa de hieloes

Q2 -15,940 kcal

Answer:

The motion of a ball falling down through the atmosphere, or a model rocket being launched up into the atmosphere are both examples of Newton's first law. The motion of a kite when the wind changes can also be described by the first law

Ps ......

Is that the kind of newtons law you were looking for because your question doesn't really make sense