The ambient air temperature considered in relation to a conductor ampacity is the temperature of the _____.

Animals eat seeds, then those seeds are spread by animals.

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Vector V is a vector with a magnitude of 6 miles per hour in a northwesterly direction on the coordinate plane. The magnitude of vector V is 6, and its direction is northwesterly.

cos θ = x / r, sin θ = y / r,

tan θ = y / x,

where θ is the angle between the vector and the x-axis, x and y are the coordinates of the vector on the coordinate plane, and r is the magnitude of the vector.

The magnitude of vector V: The magnitude of vector V is 6 miles per hour.

Therefore, r = 6.

The direction of vector V: the angle θ, the x and y components of vector V must be determined.

The angle between vector V and the x-axis is 45 degrees since the vector is going northwesterly, so the angle is halfway between 90 degrees for directly up and 0 degrees for directly to the right. Because the angle is 45 degrees, the x and y components are equal.

Therefore, the x and y components are both 6 / √2. Using

cos θ = x / r and sin θ = y / r,

The values of cos θ and sin θ.cos θ

 = 6 / √2 / 6

 = 1 / √2, and

sin θ = 6 / √2 / 6

       = 1 / √2.

Since cos θ = 1 / √2 and sin θ = 1 / √2, θ

                  = 45 degrees.

Tan θ = y / x

        = 1 / 1, so θ

        = tan⁻¹(1)

       = 45 degrees.

Therefore, the magnitude of vector V is 6, and its direction is northwesterly.

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Explanation:

this might help you i think so

Answer:

B. they must be intrinsically far more luminous than the brightest galaxies.

Explanation:

Quasar is famous for being an intergalactic object which is billions of years away from the earth yet can still be seen, unlike the other star body, unlike giant galaxies.

Hence, the fact that quasars can be detected from distances where even the biggest and most luminous galaxies cannot be seen means that "they must be intrinsically far more luminous than the brightest galaxies."

This condition, including other related evidence gotten in recent years concerning our galaxy, has shown that quasars are probably the central nuclei of very distant, very active galaxies.

Answer:

6.25 N

Explanation:

F = ma

F = 2.5 × 2.5

F = 6.25 Newtons

The starter motor consumes 1500 watts of power.

To calculate the power consumed by the starter motor, we can use the formula:

Power (P) = Current (I) × Voltage (V)

Given that the starter motor draws 150 amperes (I) at 10 volts (V), we can substitute these values into the formula:

P = 150 A × 10 V

P = 1500 watts

Therefore, the starter motor consumes 1500 watts of power.

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Answer:

14, 85 J

Explanation:

The formula of potential Energy (P.E.) is

P.E. = m * g * h, where m is the mass in kilograms, g is the acceleration due to gravity (about 10 m / \(s^{2}\) at the surface of the earth) and h is the height in meters.

Here P.E. is 0,55 kg * 10 m/s * 2,7 m = 14, 85 J

The stars of the milky way are all near a great circle on the celestial sphere. This great circle is called milky circle.

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The stars of the milky way are all near a great circle on the celestial sphere. This great circle is called milky circle.

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Answer: Yes, because the force of air resistance must be equal to the force of gravity, since the ball is not accelerating (constant velocity). Since the net forces acting on the object is zero, the object is in translational equilibrium.

No, a ball falling with constant velocity is not in translational equilibrium.

Translational equilibrium means that the net force acting on an object is zero, and this is not the case for a ball falling with constant velocity. Gravity is still acting on the ball, so there is a force pulling it downwards. However, the ball is moving at a constant velocity because the force of gravity is balanced by the force of air resistance. So, while the ball is not in translational equilibrium, it is in a state of dynamic equilibrium where the forces acting on it are balanced, resulting in a constant velocity.

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The magnitude of the force that the object exerts on the child is 100 N.

option C is the correct answer.

Newton's third law of motion states that for every action there is an equal and opposite reaction. In other words, action and reaction are equal and opposite.

Mathematically, Newton's third is given as;

Fa = Fb

where;

If the child exerts 100 N force on the object, the reaction of the object or the upward force exerted on the child by the object is 100 N in opposite direction.

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Answer:

Range describes the upper and lower limits of a thermometers' measurement scale

Answer:

reflection of the moon, or just reflection

Explanation:

when the sunlight hits the moon, it refects back to earth making the moon appear to glow          

Answer:

reflecting

Explanation:

the sun's light reflects off the moon, making the moon visible

The maximum percentage of error in the measurement of X is 10%.

So, the correct option is (c) 10%.

To find the maximum percentage of error in the measurement of X, we need to determine how the errors in the measurements of A, B, C, and D affect the calculation of X.

Let's assume that X is calculated using the formula:

X = A + B - C × D

To find the maximum percentage of error in X, we need to consider the worst-case scenario where all the errors add up in the same direction.

Let's calculate the maximum percentage of error step by step:

Percentage error in A = 1%

Percentage error in B = 2%

Percentage error in C = 3%

Percentage error in D = 4%

To calculate the maximum percentage error in X, we'll add up the absolute values of the errors:

Maximum percentage error in X = |1%| + |2%| + |3%| + |4%|

= 1% + 2% + 3% + 4%

= 10%

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Rotational velocity is the rate at which an object rotates, expressed in radians per second or revolutions per minute.

Rotational motion refers to the movement of an object around a fixed point, such as an axis. Rotational velocity is defined as the speed at which an object rotates around its axis. It is calculated by dividing the angular displacement by the time it takes to complete that rotation.

Rotational velocity is expressed in radians per second (rad/s) or revolutions per minute (RPM). The direction of rotational velocity is determined by the direction of rotation, with counterclockwise rotation having positive velocity and clockwise rotation having negative velocity.

Rotational velocity is a crucial concept in understanding the behavior of rotating systems, such as engines, turbines, and wheels. It helps to determine the amount of torque required to achieve a certain rotation speed, and it also plays a role in determining the angular momentum and energy of the system.

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Amphibians retain a set of gills their whole lives that help them to breathe in the water. So, the correct option is D.

Amphibians are defined as the class of cold-blooded vertebrates which is made up of frogs, toads, salamanders, newts, and caecilians. All amphibians that spend part of their lives in water and part of their lives on land.

Amphibians are born with gills, and some outgrow them when they become adults while others retain them for their entire lives.

Thus, the correct option is D.

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Answer: a) 200 miles because your doing 2 hours and each hours is 100 miles  :)

The rate of ventricular conduction is best determined by the QRS complex on an ECG:

An electrocardiogram (ECG) is a non-invasive test that records the electrical activity of the heart over time using electrodes placed on the skin.

The QRS complex is one of the components of the ECG waveform.

It represents the depolarization of the ventricles, which is the electrical activity that causes the ventricles to contract and pump blood out of the heart.

The duration of the QRS complex can be measured in milliseconds (ms) using calipers or a ruler on the ECG tracing.

The QRS complex duration should be less than 0.12 seconds (120 ms) in a normal ECG.

The heart rate or the rate of ventricular conduction can be determined by measuring the time interval between successive QRS complexes.

This time interval is called the R-R interval, and it represents the time it takes for the ventricles to depolarize and contract again.

The heart rate can be calculated by dividing 60 seconds by the R-R interval in seconds. For example, if the R-R interval is 0.8 seconds, the heart rate would be 75 beats per minute (60/0.8=75).

In addition to the QRS complex, other components of the ECG waveform can also be used to determine the heart rate, such as the P wave (which represents the depolarization of the atria) and the T wave (which represents the repolarization of the ventricles).

However, the QRS complex is considered the most reliable and accurate indicator of the rate of ventricular conduction.

Overall, the QRS complex on an ECG is the best indicator of the rate of ventricular conduction because it represents the electrical activity that causes the ventricles to contract and pump blood out of the heart.

By measuring the duration and timing of successive QRS complexes, the heart rate or the rate of ventricular conduction can be accurately determined.

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Refer to the photo taken. Note: I rounded to three significant figures, if you need more or less just replug in the equations I used.

Answer: For 1, 1070 N. For 2, 835 N.

1. The upward force when the elevator is accelerating upward is 1067N

2. The upward force when the elevator is accelerating downward is 834.2N

An upward force measures the total force acting on an object in the vertical direction. This is typically determined by subtracting the total upward force by the total force due to gravity.

When an elevator is moving upward, the upward force F = m(a+g)

where a is the acceleration of the elevator and g is the acceleration due to gravity

therefore F= 97( 1.2+9.8)

F = 97× 11

F = 1067N

When an elevator is moving downward, the upward force is :

F = m (g-a)

F = 97(9.8-1.2)

F = 97× 8.6

F= 834.2N

therefore the upward force when the elevator is accelerating upward and downward are 1067N and 834.2N respectively.

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Answer:

15 miles per hour

Explanation:

velocity = distance / time = 30 miles / 2 hours

The boat experiences a net force of 200 N in the forward direction, resulting in an acceleration of 0.2 m/s². Starting from rest, the boat will travel a distance of 1 m in 10 seconds. At the end of 10 seconds, the boat will have a velocity of 2 m/s.

The net force acting on the boat can be calculated by subtracting the resistive force from the propeller force:

Net force = Forward push - Resistive force

= 2000 N - 1800 N

= 200 N

The acceleration of the boat can be determined using Newton's second law of motion, which states that the net force acting on an object is equal to the mass of the object multiplied by its acceleration:

Net force = mass × acceleration

Rearranging the equation to solve for acceleration:

Acceleration = Net force / mass

= 200 N / 1000 kg

= 0.2 m/s²

Therefore, the boat's acceleration is 0.2 m/s².

To calculate the distance the boat will travel in 10 seconds, we can use the kinematic equation:

Distance = (1/2) × acceleration × time²

Substituting the given values:

Distance = (1/2) × 0.2 m/s² × (10 s)²

= 1 m

Hence, the boat will move a distance of 1 meter in 10 seconds.

Finally, to determine the boat's velocity at the end of 10 seconds, we can use another kinematic equation:

Velocity = acceleration × time

Substituting the values:

Velocity = 0.2 m/s² × 10 s

= 2 m/s

Thus, the boat's velocity at the end of 10 seconds will be 2 m/s.

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Answer:

As you increase in elevation, there is less air above you thus the pressure decreases. As the pressure decreases, air molecules spread out further (i.e. air expands) and the temperature decreases.

Rotation curves of galaxies imply the existence of dark matter because they show unexpected and anomalous behavior in the distribution of mass within galaxies.

The rotation curve of a galaxy describes the rotational velocity of stars or gas clouds at various distances from the galactic center. According to Newtonian physics, the rotational velocity should decrease with increasing distance from the center, as the gravitational pull weakens. However, observations have revealed that the rotational velocities remain constant or even increase with distance from the center, indicating the presence of additional mass beyond what is accounted for by visible matter. This discrepancy between the predicted and observed rotational velocities suggests the existence of unseen matter, commonly referred to as dark matter.

Dark matter does not emit or interact with light, making it invisible and difficult to detect directly. However, its gravitational effects can be observed through its influence on the motion of visible matter. The presence of dark matter provides the additional gravitational pull required to explain the observed high rotational velocities of stars and gas clouds in galaxies. Various astrophysical and cosmological studies, such as gravitational lensing and the cosmic microwave background radiation, further support the existence of dark matter.

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The period of oscillation of a spider hanging on a silk thread, tapped once every second, is one second.

What is the period of oscillation of a spider hanging on a silk thread when tapped once every second?

The time it takes for one complete up-and-down motion of the spider on the silk thread is called the period of oscillation, denoted by T. We know from the problem statement that the spider has the largest amplitude on its bungee cord when tapped exactly once every second.

If the tapping is done exactly once every second, then the spider is experiencing a periodic force with a frequency of 1 Hz. In this case, the period of oscillation T is equal to the reciprocal of the frequency, which is:

T = 1/f = 1/1 Hz = 1 second

Therefore, the spider completes one full oscillation (i.e., up-and-down motion) every second.

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In a photoelectric-effect experiment, the work function for the material is approximately 1.713 × 10^-19 J, and the implied value of Planck's constant h is approximately 6.626 × 10^-34 J·s.

The work function for the material can be determined using the equation:

hf = Φ + eV

where hf is the energy of a photon, Φ is the work function, e is the elementary charge, and V is the stopping potential. Rearranging the equation, we get:

Φ = hf - eV

To find the value of Planck's constant h, we can use the relationship:

c = λf

where c is the speed of light, λ is the wavelength of the light, and f is the frequency. Rearranging the equation, we have:

f = c / λ

Now, let's calculate the work function and the value of Planck's constant h for the given data.

For a light of wavelength 600 nm (600 × 10^-9 m), the stopping potential is 1.0 V. Plugging these values into the equation, we have:

Φ = (hc / λ) - eV

  = (6.626 × 10^-34 J·s × 3.0 × 10^8 m/s) / (600 × 10^-9 m) - (1.6 × 10^-19 C × 1.0 V)

  = 3.313 × 10^-19 J - 1.6 × 10^-19 J

  = 1.713 × 10^-19 J

For a light of wavelength 400 nm (400 × 10^-9 m), the stopping potential is 2.0 V. Plugging these values into the equation, we have:

Φ = (hc / λ) - eV

  = (6.626 × 10^-34 J·s × 3.0 × 10^8 m/s) / (400 × 10^-9 m) - (1.6 × 10^-19 C × 2.0 V)

  = 4.939 × 10^-19 J - 3.2 × 10^-19 J

  = 1.739 × 10^-19 J

For a light of wavelength 300 nm (300 × 10^-9 m), the stopping potential is 3.0 V. Plugging these values into the equation, we have:

Φ = (hc / λ) - eV

  = (6.626 × 10^-34 J·s × 3.0 × 10^8 m/s) / (300 × 10^-9 m) - (1.6 × 10^-19 C × 3.0 V)

  = 6.571 × 10^-19 J - 4.8 × 10^-19 J

  = 1.771 × 10^-19 J

Therefore, the work function for the material is approximately 1.713 × 10^-19 J, and the implied value of Planck's constant h is approximately 6.626 × 10^-34 J·s.

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Answer:

The walker travelled 3.6 miles.

Explanation:

d = vt

(v is velocity or speed and t is time, and d is distance.)

d=(3.0 mph)(1.2)

Leave the time in hours, since the unit for the speed is miles per hour.

d=3.6 miles

The distance will the walker travel if he walks at 3.0 miles per hour for 1 hour and 20 minutes is 3.6 km.

Distance is defined as the entire path traveled by an object in motion, regardless of path direction. The distance is symmetric, which means that for any two points P1 and P2, the distance between them is equal to the distance between them, or d(P1, P2) = d(P2, P1). 3. The triangle inequality is a less visible feature of the distance function. P1 for any point. The quantity of meters in a vector unit is the distance factor.

Distance = velocity x time

Given velocity = 3.0 miles per hour

Time = 1.2 hour

Distance = 3.0 x 1.2

Distance = 3.6 km/hour.

Thus, the distance will the walker travel if he walks at 3.0 miles per hour for 1 hour and 20 minutes is 3.6 km.

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The radio wave's wavelength is 1.0 m. A waveform signal that is carried in space or down a wire has a wavelength, which is the separation between two identical places (adjacent crests) in the consecutive cycles.

The following formula was used to determine the frequency:

radio wave speed, c = radio wave frequency / radio wave length

c = f x λ

Because a radio wave is an electromagnetic wave and travels at the same speed as light, its speed, c = 3 x 108 m/s, is equal to the speed of light in this case.

When the formula

3 x 108= f x 1.0

f = 3 x 108/1

f = 3 x 108 Hz is used,

Radio waves therefore have a frequency of 3 x 108 Hz.

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