Within a species of fish, sizes often range from large to small. some fishing practices exclude small fish from a species from being caught, but allow capture of larger fish in the same population. 1. if commercial fishermen use practices that exclude small fish from being caught, what effect do you think this will have on the size of fish over time? 2. explain how natural selection would cause that effect. 3. if fishermen stopped using the practices that exclude smaller fish, it is hypothesized that fish sizes will not return to the original range. explain why they would not return to their original size range.

The most commonly used source as a continuum source in ultraviolet (UV) spectroscopy is a Deuterium lamp.

A Deuterium lamp, which contains a discharge tube filled with Deuterium gas, emits light over a broad spectral range, particularly in the UV region. The lamp operates by applying a high voltage across the discharge tube, which ionizes the Deuterium gas and produces a plasma. As the ions recombine, they emit light in the UV region.

The emission spectrum of a Deuterium lamp covers a wide range of wavelengths in the UV region, typically from around 180 nm to 400 nm. Due to its continuous and broad spectrum, a Deuterium lamp is commonly used as a continuum source in UV spectroscopy for various applications, including absorbance, fluorescence, and wavelength calibration.

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The angle of incidence at which the reflected light is fully polarized can be determined using the formula:

\(\tan(\theta_p) = \frac{{n_2 - n_1}}{{n_2 + n_1}}\)

where \(\theta_p\) is the angle of polarization, \(n_1\) is the refractive index of the first medium (1.38), and \(n_2\) is the refractive index of the second medium (1.67).

To find the angle of incidence, we substitute the given refractive indices into the formula:

\(\tan(\theta_p) = \frac{{1.67 - 1.38}}{{1.67 + 1.38}}\)

Simplifying the expression:

\(\tan(\theta_p) = \frac{{0.29}}{{3.05}}\)

To calculate the angle of polarization, we take the arctan of the resulting fraction:

\(\theta_p = \arctan\left(\frac{{0.29}}{{3.05}}\right)\)

Using a calculator, we find:

\(\theta_p \approx 5.41^\circ\)

Therefore, the angle of incidence at which the reflected light is fully polarized is approximately \(5.41^\circ\).

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\(velocity = \frac{distance}{time} \)

\( \frac{(30 + 10 + 80) \times 1000}{83 \times 60} \)

\( = 0.024m.{s}^{ - 1} \)

Answer:

Explanation:

Physical properties are used to perceive and express matter and they can be preserved or regulated without varying the configuration of matter ( which involves shape, texture, color, odor, melting point, boiling point, density, solubility, polarity, e.t.c.).

Our final position will be -5m left from the origin while the initial position was 3m right from the origin.

We are standing at 3.0 m right from the origin and we start walking towards left with a speed of 2.0 m/s.

The position after 4.0 seconds can be found as.

Speed = Displacement/time

Displacement = X, initial position is +3.0 m

Putting all the values,

2 = X/4

X = 8m

X is the magnitude of the displacement.

Displacement  = -8m

Negative sign shows the direction of displacement.

Displacement = final - initial position.

-8m = Final position - 3m

Final position = -5m

So, the final position will be -5m on the left of the origin.

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If the force applied is 4cm away from the elbow, torque = 1417.3 N

Solution:

Torque = Force * Displacement

1063 = F * 0.03

F = 35433.3 N

New Torque = 35433.3 * 0.04

                     = 1417.3 N

The force that can cause an object to rotate along an axis is measured as torque. Similar to how force accelerates an item in linear kinematics, torque accelerates an object in an angular direction. A vector quantity is a torque.

Rotational force or torque, as the name implies, causes an item to rotate. Thus, it denotes the force that the rotating drive shaft of the vehicle experiences. On the other hand, linear acceleration is caused by force (N). The sum of a force's force and its speed determines an engine's power.

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The minimum kinetic energy of a confined proton is 4.88 × 10⁻¹¹ J when it is confined within a nucleus.

The given radius of an atomic nucleus = r = 5.3 × 10⁻¹⁵ m

(a) The minimum uncertainty in the momentum of a proton when it is confined within the nucleus can be calculated using Heisenberg's Uncertainty Principle. According to Heisenberg's uncertainty principle, the minimum uncertainty in the momentum of a confined particle is given as follows:

\(Δp . Δx >= h/2π\), where Δp is the minimum uncertainty in the momentum of the particle, Δx is the minimum uncertainty in the position of the particle h is the Planck's constantπ is a mathematical constant

The minimum uncertainty in the momentum of a confined proton = Δp = (h/2π) / r

Where h = 6.626 × 10⁻³⁴ J s is Planck's constant

Π = 3.1416

Therefore, Δp = (6.626 × 10⁻³⁴ J s / 2 × 3.1416 × 5.3 × 10⁻¹⁵ m)

Δp = 3.72 × 10⁻²¹ kg m/s(b) Since the proton is confined within the nucleus, the minimum kinetic energy of the proton can be calculated as follows:\(K.E(min) = p²/2m\)

where p = Δp = 3.72 × 10⁻²¹ kg m/s is the minimum uncertainty in momentum of the confined proton

m = 1.67 × 10⁻²⁷ kg is the mass of a proton

K.E(min) = (3.72 × 10⁻²¹ kg m/s)² / 2 × 1.67 × 10⁻²⁷ kg

K.E(min) = 4.88 × 10⁻¹¹ J

Thus, the minimum kinetic energy of a confined proton is 4.88 × 10⁻¹¹ J when it is confined within a nucleus.

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Answer:

I = 16amp

Explanation:

Charge coulomb ( Q ) = It

Where I =current in ampere

t = time = 5 seconds

80 = I × 5

I = 80/5

I = 16amp

The current through the circuit will be I = 16amp

Answer:

J = 500 kg-m/s

Explanation:

Given that,

Initial speed of the motor, u = 5 m/s

Final speed of the motor, v = 7 m/s

Mass of the boat, m = 250 kg

We need to find the impulse applied by the motor. We know that impulse is equal to the change in momentum. It is represented by letter J.

J = m(v-u)

J = 250 (7-5)

J = 500 kg-m/s

Hence, the impulse applied by the motor is 500 kg-m/s.

Out of the given situations, the one that exhibits positive feedback and can cause a further increase in temperature is option C - An increase in temperature causes methane ice in the oceans to melt,

releasing this methane, a greenhouse gas to the atmosphere. This situation results in a positive feedback loop where an increase in temperature causes more methane to be released,

which further increases the temperature, causing more methane to be released. Methane is a potent greenhouse gas that traps heat in the atmosphere, thus leading to an increase in temperature.

As the temperature increases, more methane is released, causing a further increase in temperature, leading to a never-ending cycle of positive feedback.

It is important to note that this situation can have severe consequences as it can lead to a runaway greenhouse effect, which can have catastrophic effects on the climate.

Therefore, it is crucial to take steps to mitigate the release of greenhouse gases into the atmosphere and work towards reducing the global temperature.

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Answer:

LOL! couldnt be me either bestieeeee

Answer:

-_-

Explanation:

i dont know What was XD??

Answer:

The collision speed of the two cars is 8.8 m/s.

In the dry and extremely hot conditions of Southern California during summer, at approximately 1 pm, one would expect to see that the stomata of plants are closed. This is because to avoid excessive water loss through transpiration, plants tend to close their stomata, which are tiny openings on the surface of leaves responsible for gas exchange. Closing the stomata helps to conserve water by reducing the loss of water vapor from the plant's leaves.

Stomata play a crucial role in gas exchange during photosynthesis. However, when plants are exposed to hot and dry conditions, the closure of stomata becomes essential to prevent excessive water loss. By closing their stomata, plants can reduce transpiration and conserve water. Transpiration is the process through which water vapor escapes from the plant through the stomata.

Closing the stomata helps in minimizing water loss by reducing the evaporation of water from the plant's leaves into the surrounding dry air. This is particularly important in drought conditions when water availability is limited. By conserving water, plants can better withstand the dry and hot environment.

While the closure of stomata helps in water conservation, it also has an impact on photosynthesis. When the stomata are closed, the exchange of gases, including carbon dioxide (CO2) for photosynthesis, is restricted. As a result, the rate of photosynthesis decreases. However, in extremely hot and dry conditions, the priority for the plant is to conserve water rather than carry out photosynthesis. Therefore, it is expected that the stomata will be closed to limit water loss, even though this reduces the availability of CO2 for photosynthesis.

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Answer:

Hello, Rotting, burning, cooking, and rusting are all further types of chemical changes because they produce substances that are entirely new chemical compounds. For example, burned wood becomes ash, carbon dioxide, and water. When exposed to water, iron becomes a mixture of several hydrated iron oxides and hydroxides.

Explanation:

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The mass of the weight, W is equal to (F - B) / g.

The mass of the weight, W is determined as given below:

The force F supports the weight of box W and the weight of the mass B

Hence, F = B + W

W = F - B ---- (1)

However, the weight of an object is the product of its mass and the acceleration due to gravity, g

Hence, W = mg --- (2)

where;

m is the mass of the weight, W

Equating the two values

mg = F - B

m = (F - B) / g

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Answer:

It's B C D E are maintaining a constant velocity

Answer:

29.4N is a 3.0kg bag of bolts weigh.

The force by gravitation is called the weight of a body. The weight of the body with a mass of 3 Kg is 29.4 N.

Gravitational force is a kind of force by which an object attracts other objects into its center of mass. Earth attracts every objects into its center and thereby we are all standing on the surface.

Gravitational force is acting downward on a body and it depends on the mass of the body. Greater the mass, greater will be the fore of gravitation and its weight experienced on earth.

Given that, mass of the bag = 3 Kg.

force by gravitation  = Mg = 3 × 9.8 m/s² = 29.4 N.

where, g is the acceleration due to gravity. Therefore, the weight of the bag is 29.4 N. Hence, option D is correct.

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Answer:

Given,

Object distance, u=25cm

Focal length, f=20cm

From mirror formula

f

1

​

=

v

1

​

+

u

1

​

−20

1

​

=

v

1

​

−

25

1

​

⇒

v

1

​

=−

20

1

​

+

25

1

​

v=100cm

The image will be real, inverted magnified

Explanation:

Given,

Object distance, u=25cm

Focal length, f=20cm

From mirror formula

f

1

​

=

v

1

​

+

u

1

​

−20

1

​

=

v

1

​

−

25

1

​

⇒

v

1

​

=−

20

1

​

+

25

1

​

v=100cm

The image will be real, inverted magnified

Answer:

it is less dense than the liquid it is placed in.  Explanation:

Answer:

The density of an object determines whether it will float or sink in another substance. An object will float if it is less dense than the liquid it is placed in. An object will sink if it is more dense than the liquid it is placed in.

A solid object will float on a liquid if the solid is less dense than the liquid.

We don’t often think about this, but ice floats on liquid water, because ice is less dense than water. It is one of the few substances whose solid is less dense than its liquid. If it weren’t, ice would drop to the bottom of the oceans and lakes, and these bodies of water would remain frozen year round. Life would almost certainly not have evolved on Earth if this were the case.

Explanation:

The landform that was most affected by erosion and experienced the highest amount of sediment displacement is the riverbed. This is due to the constant flow of water, which exerts a significant force on the riverbed.

Among various landforms, rivers are particularly susceptible to erosion and sediment displacement. The continuous flow of water in rivers exerts hydraulic pressure, which plays a crucial role in erosion. As water moves downstream, it carries sediments and debris along with it. The force of the flowing water can dislodge rocks, soil, and other loose materials from the riverbed, resulting in erosion.

Additionally, the velocity and volume of water in rivers can vary significantly, especially during heavy rainfalls or floods, further increasing the erosive power. This continuous erosion and transport of sediment contribute to the formation and reshaping of river valleys, as well as the deposition of sediment in delta regions and floodplains. Consequently, the riverbed stands out as the landform most affected by erosion and the one with the highest amount of sediment displaced.

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C. a decrease in energy.

When water vapor cools, its molecules lose energy, causing them to move closer together. As the molecules become more closely packed, they eventually form liquid water. This change in the state of matter is known as condensation.

When water vapor loses energy through cooling, its molecules become closer together and eventually form liquid water. This process is called condensation.

Therefore, the correct answer to the question is C. a decrease in energy.

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The minimum and maximum braking distances needed to ensure that all vehicles traveling at the posted speed limit can stop before reaching the intersection are as follows:

- For small cars: Minimum ≈ 1773.028 m, Maximum ≈ 1568.850 m

- For large trucks: Minimum ≈ 3285.760 m, Maximum ≈ 2409.595 m

To calculate the minimum and maximum braking distances, we can use the equations of motion for a decelerating vehicle.

The equation for the braking distance of a vehicle is given by:

d = (v^2) / (2 * μ * g)

where d is the braking distance, v is the initial velocity of the vehicle, μ is the coefficient of friction between the tires and the road, and g is the acceleration due to gravity.

Let's calculate the minimum and maximum braking distances separately for small cars and large trucks.

For small cars with a mass of 563 kg:

- Minimum braking distance:

  v = 8989 km/h = (8989 * 1000) / 3600 m/s = 2496.944 m/s

  μ_min = 0.536

  d_min = (v^2) / (2 * μ_min * g) = (2496.944^2) / (2 * 0.536 * 9.8) ≈ 1773.028 m

  Maximum braking distance:

  μ_max = 0.599

  \(d_max = (v^2) / (2 * μ_max * g) = (2496.944^2) / (2 * 0.599 * 9.8) ≈ 1568.850 m\)

For large trucks with a mass of 3951395 kg:

- Minimum braking distance:

  v = 8989 km/h = 2496.944 m/s (same as for small cars)

  μ_min = 0.350

 \(d_min = (v^2) / (2 * μ_min * g) = (2496.944^2) / (2 * 0.350 * 9.8) ≈ 3285.760 m\)

  Maximum braking distance:

  μ_max = 0.480

 \(d_max = (v^2) / (2 * μ_max * g) = (2496.944^2) / (2 * 0.480 * 9.8) ≈ 2409.595 m\)

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Answer:

middle ear has three bones! the hammer, anvil, stirrup, and ear drum

Explanation:

Answer:

D

Explanation:

The most suitable testable question. in this case, would be that 'are there more home runs during the more humid months of the  summer?'

Since the aim of the investigation is to find the relationship between humidity and the number of home runs, measuring the number of home runs during the more humid months in the summer and comparing the data to the number of home runs during the less humid months in the same summer would provide the answer.

Only option D raises a valid question that is relevant to the aim of the investigation.

Answer:

Explanation:

Exercise controls weight. Exercise can help prevent excess weight gain or help maintain weight loss. ...

Exercise combats health conditions and diseases. ...

Exercise improves mood. ...

Exercise boosts energy. ...

Exercise promotes better sleep. ...

Exercise puts the spark back into your sex life. ...

Exercise can be fun … and social!

It would take 1.556 seconds for the barrier to crumple and safely slow down the person with a force of 1180 N.

To calculate the time required to crumple the barrier and safely slow down the person, we can use the concept of impulse.

The impulse, denoted by J, is defined as the product of force and time, and it represents the change in momentum of an object. In this case, the impulse required to safely slow down the person can be calculated using the maximum force and the person's initial momentum.

The momentum of a person is given by the product of their mass and velocity:

Momentum = mass × velocity

Given that the person's mass is 68 kg and their velocity is 27 m/s, the initial momentum is:

Initial momentum = 68 kg × 27 m/s

To safely slow down the person, the impulse provided by the barrier should be equal to the change in momentum.

Therefore, we have:

Impulse provided by barrier = Final momentum - Initial momentum

Since the person is brought to rest, the final momentum is zero. Thus, we have:

Impulse provided by barrier = -Initial momentum

Now we can express the impulse in terms of force and time:

Impulse provided by barrier = Force × Time

Plugging in the known values, we can solve for time:

-Initial momentum = Force × Time

68 kg × 27 m/s = 1180 N × Time

Simplifying the equation, we find:

Time = (68 kg × 27 m/s) / 1180 N

Evaluating the expression:

Time = 1836 kg·m/s / 1180 N

Finally, converting kg·m/s to seconds, we get:

Time ≈ 1.5559 seconds

Therefore, it would take approximately 1.556 seconds for the barrier to crumple and safely slow down the person with a force of 1180 N.

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The emf of the larger inductor is 6 V.

When two inductors are connected in series, the total inductance of the combination is the sum of the individual inductances. In this case, the 3.5 mH and 4.5 mH inductors are connected in series.

Using the formula for the total inductance of inductors in series:

1/L_total = 1/L1 + 1/L2

Substituting the given values:

1/L_total = 1/3.5 mH + 1/4.5 mH

To simplify the calculation, we can convert the inductance values to a common unit, such as henries (H):

1/L_total = 1/(3.5 × 10^-3 H) + 1/(4.5 × 10^-3 H)

Calculating the values:

1/L_total = 0.2857 H^-1 + 0.2222 H^-1

1/L_total = 0.5079 H^-1

Taking the reciprocal of both sides:

L_total = 1/0.5079 H

L_total = 1.9697 H

Now we can find the emf of the larger inductor using the formula for the emf in an inductor:

Emf = L × di/dt

Given that the total emf of the combination is 16 V, and the total inductance (L_total) is 1.9697 H, we can rearrange the formula to solve for the emf of the larger inductor (Emf_larger):

Emf_larger = Emf_total - Emf_smaller

Emf_larger = 16 V - Emf_smaller

Substituting the values:

Emf_larger = 16 V - 10 V

Emf_larger = 6 V

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