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Bernoulli's equation allows to find the correct result for wing lift is:

       1: by forcing air to move faster over the top of the wing

In fluid mechanics that studies the motion of fluids, the conservation of energy and work is given by the Bernoulli equation

          P₁ + ½ ρ g v₁² + ρ g y₁ = P₂ + ½ ρ g v₂² + ρ g y₂

Where 1 and 2 are the points of interest, above and below the wing, ρ the density, v the velocity, and y the height.

To simplify, suppose that the wing is horizontal, so the difference in height is the width of the wing, the so-called lift is the difference in pressure between the inner and upper part of the wing.

           (P₂-P₁) = ½ ρ (v₁² - v₂²) + ρ g (y₁-y₂)

For a positive lift ΔP> 0 and for the plane to climb, we must have several facts:

Let's reverse the claims:

      1. True. This makes the term of the kinetic energy be greater and there is greater lift.

     2. False. If the velocity is the same, the energy difference is zero and the substantiation is zero or negative.

     3. False. That makes the lift negative.

In conclusion using Bernoulli's equation we can find the correct result for the wing lift is:

          1: by forcing air to move faster over the top of the wing

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We need the position vectors of a particle at two points along its path and also know the time it took to move from one point to the other to find the instantaneous velocity but not the average velocity.

We need to take a moment to be able to explain to ourselves again the meaning of the term velocity. Let us recall that the term velocity would have to do with the change in the position of an object with time.

We know that the velocity is a vector quantity and as such we must have to look at the direction in which the distance that has been covered has passed through and this is something that we must keep in  mind as we work through this question.

Now, we know that the velocity is the change in position as such we need the two positions of the object and the approximate time taken to make the change.

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Answer:

A) W =250J B) Power = 125 J/s  C) Work = 250 J Power = 250 J/s

Explanation:

Work = Force*distance

A:

\(W = 10kg*10m/s^2*2.5m\\W = 250 J\\\)

B:

Power is J/s

Power = 250J/2.0s = 125 J/s

C:

Work stays the same

Power increases to 250 J/s

a) The capacitance of the ceramic capacitor is approximately 354.16 pF.

b) The potential difference between the plates of the capacitor will be approximately 3.39 x 10^6 volts.

To calculate the capacitance of the ceramic capacitor, we can use the formula:

C = (ε₀ * εᵣ * A) / d

where:

C is the capacitance,

ε₀ is the vacuum permittivity (approximately 8.854 x 10^(-12) F/m),

εᵣ is the relative permittivity of the ceramic (given as 100),

A is the effective plate area (given as 4 cm², which is equal to 4 x 10^(-4) m²),

d is the separation between the plates (given as 0.1 mm, which is equal to 0.1 x 10^(-3) m).

Let's calculate the capacitance in picofarads (pF):

a) Calculation of capacitance (C):

C = (ε₀ * εᵣ * A) / d

= (8.854 x 10^(-12) F/m * 100 * 4 x 10^(-4) m²) / (0.1 x 10^(-3) m)

= (8.854 x 100 x 4) / 0.1

= 354.16 pF

Therefore, the capacitance of the ceramic capacitor is approximately 354.16 pF.

b) To find the potential difference (PD) between the plates when the capacitor is given a charge of 1.2 μC (microcoulombs), we can use the formula:

PD = Q / C

where:

PD is the potential difference,

Q is the charge (given as 1.2 μC, which is equal to 1.2 x 10^(-6) C),

C is the capacitance (calculated in part a) as 354.16 pF, which is equal to 354.16 x 10^(-12) F).

Let's calculate the potential difference (PD):

b) Calculation of potential difference (PD):

PD = Q / C

= (1.2 x 10^(-6) C) / (354.16 x 10^(-12) F)

= 3.39 x 10^6 V

Therefore, the potential difference between the plates of the capacitor will be approximately 3.39 x 10^6 volts.

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It would take approximately 1.33 x 10^8 seconds (or about 42 years) for a light signal from Earth to reach Proxima Centauri. For a spacecraft traveling at 0.0001c, it would also take about 42 years to reach Proxima Centauri.

To calculate the time it takes for a light signal to travel from Earth to Proxima Centauri, we can use the formula:

Time = Distance / Speed

Given:Distance to Proxima Centauri = 4.0 x 10^13 km (convert to meters by multiplying by 10^3, as 1 km = 10^3 m)

Speed of light (c) = 3 x 10^8 m/s

Converting the distance to meters:

Distance = 4.0 x 10^13 km * 10^3 = 4.0 x 10^16 m

Using the formula, we can calculate the time it takes for the light signal to travel:

Time = Distance / Speed = (4.0 x 10^16 m) / (3 x 10^8 m/s)

Time ≈ 1.33 x 10^8 seconds

To calculate the number of years it would take for a spacecraft traveling at a speed of 0.0001c to reach Proxima Centauri, we need to divide the distance by the speed of the spacecraft.

Speed of spacecraft (v) = 0.0001c = 0.0001 * 3 x 10^8 m/s = 3 x 10^4 m/s

Time = Distance / Speed = (4.0 x 10^16 m) / (3 x 10^4 m/s)Time ≈ 1.33 x 10^12 seconds

To convert seconds to years, divide the time by the number of seconds in a year:

Number of years ≈ (1.33 x 10^12 seconds) / (3.1536 x 10^7 seconds/year)

Number of years ≈ 42 years

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We are given a data set and we are asked to determine what could be the origin of the errors.

The errors in measurement are usually due to the resolution of the measuring device. This means that the device with which we are doing the measurement has a resolution that makes it impossible to differentiate between small quantities.

To improve this problem what can be done is to change the instrument of measurement for one with a higher resolution.

Another cause of errors is that the measurement is done by different persons. For example, if a person measures the distance from one point to another is possible that this measurement differs from the measurement done by another person. To improve this issue, all measurements should be done by the same person.

Another problem can be the calibration of the instrument since as the instrument is used for several measurements its ability to get correct measurements decreases. To avoid this error, instruments must be calibrated regularly.

Finally, another possible source of error is human errors that could be due to poor techniques or error transcribing the data. This can be improved by being extremely careful when making the measurements.

Answer: Can't see clearly.

Explanation:

Answer:

PE = 1/2 K X^2

K = 50 N/m

X = .3 m

PE = 1/2 * 50 * .3^2 = 2.25 Joules

Answer:

Density

Explanation:

Answer:

The graph of the velocity of an object in free fall would look like a straight line sloping downward. As the object falls, its velocity increases at a constant rate, so the graph of its velocity versus time will be a straight line with a negative slope. This is because acceleration due to gravity is a constant -9.8 meters per second squared, so the velocity of a free-falling object will increase by 9.8 meters per second every second.

Therefore, the graph that shows the change in velocity of an object in free fall is a straight line with a negative slope. Here is an example of such a graph:

Free Fall Velocity Graph

The break shot speed of the player is determined as 96.5 ft/s.

use the following kinematic equation to determine the time of motion of the player.

h = vt + ¹/₂gt²

h = 0 + ¹/₂gt²

h = ¹/₂gt²

t = √(2h/g)

t = √(2 x 2.75/32.17)

t = 0.171 s

vx = x/t

vx = 16.5 ft / 0.171 s

vx = 96.5 ft/s

Thus, the break shot speed of the player is determined as 96.5 ft/s.

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The second possibility is that the firefighters can position their cannon anywhere within a range of 60.2 m from the building to hit the blaze at 10.0 m above ground level.

What is Horizontal Velocity?

Horizontal velocity is the component of velocity in the horizontal direction, perpendicular to the vertical direction. It describes the speed and direction of motion of an object in the horizontal plane. In the absence of external forces, the horizontal velocity of an object moving through the air remains constant, as there is no force acting on the object in the horizontal direction.

Let's first find the time it takes for the water to reach the maximum height:

The vertical component of the initial velocity is:

vy = v * sin(θ) = 29.0 m/s * sin(53.0°) = 22.7 m/s

Using the kinematic equation:

where Δy = 10.0 m, vyi = 22.7 m/s, and a = -9.81 m/\(s^{2}\) (the negative sign indicates that acceleration is in the opposite direction to the initial velocity).

We get:

10.0 m = 22.7 m/s * t - 1/2 * 9.81 m/\(s^{2}\) * \(t^{2}\)

Simplifying and solving for t, we get:

t = 1.61 s

Now, let's find the horizontal displacement of the water:

The horizontal component of the initial velocity is:

vx = v * cos(θ) = 29.0 m/s * cos(53.0°) = 18.7 m/s

Using the equation:

Δx = vx * t

where Δx is the horizontal displacement, vx is the horizontal component of the initial velocity, and t is the time we found above.

We get:

Δx = 18.7 m/s * 1.61 s = 30.1 m

So the firefighters should position their cannon 30.1 m away from the building.

To find the second possibility, we need to find the range of the water cannon, which is the horizontal distance traveled by the water before it hits the ground. The range can be calculated using the formula:

where R is the range, v is the initial velocity, θ is the angle above the horizontal, and g is the acceleration due to gravity.

Plugging in the values we get:

R = \(29.0^{2}\) * sin(2 * 53.0°) / (2 * 9.81) = 60.2 m

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Answer:

Explanation:

The upward force equals to the downward force. the summation force of those 2 is 0. the rightward force is the resultant force. ∴ the object moves to rightwards by speeding up. (F=ma). The object experiencing unbalanced forces.

Answer:

As thermal energy increases,there is more particle movement

Hooke's law of elasticity is a principle in physics that states that the force required to extend or compress a spring by some distance is proportional to that distance. It is named after the English physicist Robert Hooke, who first stated the law in 1678. Hooke's law is often written as F = -kx, where F is the force applied to the spring, x is the distance it is stretched or compressed, and k is the spring constant, a measure of the stiffness of the spring.

Answer:

1.4 m/s2

Explanation:

i took the test

Answer:

c for first b for second

Explanation:

so sorry if it not true

Answer: \(1302.25\ N\)

Explanation:

Given

Inclination of hill \(\theta=8^{\circ}\)

Each revolution moves 6 m along its path

Diameter of the circle \(D=30\ cm\)

the total mass of the cyclist and his bike  \(M=150\ kg\)

Suppose a single pedal cyclist gain a vertical height of  \(\Delta y\)

\(\therefore \sin \theta =\dfrac{\Delta y}{6}\\\\\Delta y=6\sin 8^{\circ}\)

Average force cause to gain in Potential energy

\(\therefore\ F_{avg}\cdot 2\pi r=Mg\Delta y\\\Rightarrow F_{avg}=\dfrac{150\times 9.8\times 6\sin 8^{\circ}}{2\pi\cdot 0.15}\\\\\Rightarrow F_{avg}=1302.25\ N\)

Thus, the average force is \(1302.25\ N\)

Answer:

Conservation of momentum

Explanation:

Out of the two options given, the more appropriate one is the law of conservation of momentum. This is particularly so because momentum deals with the velocity or speed of the car while considering its mass. So, if a large car is to collide with another car, small one, then the momentum is what is considered. Energy on the other hand is talking about the work that is done, while the momentum considers the mass of the car while it is moving and considering its speed also

Answer:

1. Option D. 1.86x10^19 electrons.

2. Option B. 4.0x10^–16C.

Explanation:

1. Determination of the number of electrons in – 3C.

This can be obtained as follow:

–1C = 6.2x10^18 electrons

Therefore, –3C = –3C/–1C x 6.2x10^18 electrons = 1.86x10^19 electrons.

Therefore, there are 1.86x10^19 electrons in –3C.

2. Determination of the number of coulomb in +2500e.

This can be obtained as follow:

1e = 1.602176x10^–19C

Therefore, 2500e =

2500 x 1.602176x10^–19 = 4.0x10^–16C

Therefore, 2500e contains 4.0x10^–16C

Given,

The mass of the block, m=51.0 kg

The angle, θ=-25°

The coefficient of static friction, μ_s=0.1

The coefficient of kinetic friction, μ_k=0.03

(a)

The minimum force that is needed to get the block moving is equal to the static frictional force that acts on the block.

Thus, the minimum force required is,

Where N is the normal force acting on the block and g is the acceleration due to gravity.

On substituting the known values,

Thus the minimum force needed to get the block moving is 49.98 N

(b)

When the block starts to move, the static friction will no longer act on the block. When the block is moving, the kinetic friction starts to act on the block.

Thus the net force on the block when it starts to move is given by,

Where f is the kinetic friction acting on the block and a is the acceleration of the block.

On substituting the known values,

Thus, the acceleration of the block once it starts to move is 0.69 m/s²

Answer:

a. If the frequency of light is increased above the threshold frequency, the energy of the electrons emitted will increase.

b. If the frequency of light is decreased to below the threshold frequency, the rate at which electrons are emitted will decrease.

c. If the intensity of light is decreased, the energy of the electrons emitted will remain the same, but fewer electrons will be emitted.

d. If the intensity of light is decreased, the rate at which electrons are emitted will decrease.

The power wasted in the transmission line connecting the power house to the consumer is 2kW.

The equation Power = Potential difference*Current, or P = VI, can be used to compute the amount of energy that is wasted.

We can see that it is given,

V1 = 600 V

V2 = 580 V

Current= I = 100 A

We need to figure out how much energy is lost in the transmission line that runs from the generator to the consumer.

In physics, power is the amount of energy that is transferred or transformed in a given amount of time.

The International System of Units uses the watt, or one joule per second, as the unit of power.

The formula for the voltage across the transmission line is V = V1 - V2.

Thus, V = 600 - 580

V = 20V

We've been told that I equals 100 A.

The power loss equation is given by P = VI, where V is the potential difference and I is the current.

Power loss = VI, therefore becomes

P = 20 × 100

P = 2000 W

P = 2kW

Therefore, 2 kW of power is lost in the transmission line that connects the power source to the customer.

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The momentum of the baseball with a mass of 0.14 kg and velocity of 41.26 m/s is determined as 5.78 kgm/s.

The momentum of the baseball is calculated by applying the following formula as shown below;

P = mv

where;

The momentum of the baseball is calculated as follows;

mass of the baseball = 0.14 kg

velocity of the baseball = 41.26 m/s

momentum, P = mv

P = 0.14 kg  x  41.26 m/s

P = 5.78 kgm/s.

Thus, the momentum of the baseball with a mass of 0.14 kg and velocity of 41.26 m/s is determined as 5.78 kgm/s by applying the formula for linear momentum.

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The complete question is below:

Imagine a baseball pitcher and a batter. The baseball has a mass of 0.14 kg. The ball is pitched to the right with a velocity of 41.26 m/s. What is the momentum of the baseball?

Answer:

C

Explanation:

Gravity is the main reason that make our planets to pull each other

Answer:

The answer is D. Here is proof . Plz mark brainliest

Explanation: