Protostars are difficult to observe because :__________.
a. the protostar stage is very short. they are surrounded by cocoons of gas and dust.
b. the protostar stage is very short, they are surrounded by cocoons of gas and dust, and they radiate mainly in the infrared.
c. they are all so far away that the light hasn't reached us yet.
d. they radiate mainly in the infrared.

Answer:

The other end is called the south pole. When two magnets are brought together, the opposite poles will attract one another, but the like poles will repel one another. This is similar to electric charges.

Explanation:

Answer: A magnet has two ends called poles the answer are the poles

North pole and South pole

Explanation:

plz mark brainliest

Answer:

The angle will be 0 . The angle between the incident ray and the mirror is called angle of incidence while the angle between reflected ray and the normal is called angle of reflection. Here, the a ray of light is incident normally on a plane mirror.

Explanation:

The Angular velocity is 54.55 rad/s

What is angular velocity?
The rate at which an angle between two bodies changes is known as angular velocity. Something changes when an object rotates or revolves around an axis. This displacement is depicted in the image by the angle formed by a line on just one body and a line on the other. Technical terms like degrees, 360-degree revolutions, as well as revolutions per minute have been frequently used to describe angles or angular displacements (rpm). Angles and angular velocities are typically expressed in radians as well as radians per second, respectively, in mathematics and physics.

These conversion factors link these measurements together:
A radian equals 1/180 (or 0.0175) of a degree, and a radian per second = 1/30 (or 0.105) of a radian.
Angular velocity W= U/r
Given V= 30m/s ; r=0.55mW=3/0.55 = 54.55 rad/s

Hence the answer is 54.55 rad/s

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It is same for both the balls. Due to the fact that balls fall freely regardless of their weight, both metallic balls take the same amount of time to reach the ground.

When two identically sized objects are dropped from a certain height, they will fall with gravitational acceleration (g). The weight of the objects will not affect how long it takes them to reach the ground. The density of the medium in which an object is dropped affects how long it takes for each object to travel there. Due to the influence of gravity and the same medium, we can therefore infer that both metal balls will take the same amount of time to reach the ground (air). Experiments have been conducted in vacuum rooms and show that when the balls are released from the top of the store, the acceleration of attraction to the floor is gravity and it has a value of 9.8 meters/square second regardless of its weight.

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The rate of change of the distance between the two particles is 10 units per second.

Let's call the distance between particle A and particle B "d". To find the rate of change of "d", we need to take the derivative of "d" with respect to time. By using the Pythagorean theorem to relate the distance between the two particles to their x and y coordinates:

d^2 = x^2 + y^2

Taking the derivative of both sides with respect to time, we get:

2dd/dt = 2x(dx/dt) + 2y(dy/dt)

where dx/dt is the rate of change of particle A's x-coordinate (which is equal to 2), and dy/dt is the rate of change of particle B's y-coordinate (which is equal to 3).

We need to find x and y in terms of time. Particle A is moving at a constant rate of 2 per second along the positive x-axis, so its x-coordinate is given by:

x = 2t

where t is time in seconds.

Similarly, particle B is moving at a constant rate of 3 per second along the positive y-axis, so its y-coordinate is given by:

y = 3t

Substituting these expressions for x and y into our equation for the rate of change of "d", we get:

2dd/dt = 2(2)(1) + 2(3)(1) = 10

So the rate of change of the distance between the two particles is 10 units per second.

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Therefore for cart to stay here on track when it arrives at point P, the net force applied to it must be greater or equal than for the heaviness of the cart.

The force is an impact that has the power to alter an object's motion. A mass-containing object's velocity can be altered by a force. An obvious way to describe force is as a pushed or a pull. A vector quantity is called a force since it has both strength and the direction.

The strongest force in existence is thought to be the strong force. The gravitation, weak, and electromagnetism forces come after it in lowest to highest.

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The correct answer is option D) When the fox eats an animal that eats plants, it receives energy indirectly from the sun.

Energy in a food chain flows from the sun, to the producers (plants), to the primary consumers (herbivores), to the secondary consumers (carnivores), and so on. Omnivores, such as foxes, consume both plants and animals, but they typically obtain more of their energy from consuming other animals.

When a fox eats an animal that eats plants, it is receiving energy indirectly from the sun. The plants that the prey animal consumed converted the energy from the sun into organic molecules through the process of photosynthesis. The prey animal then consumed those plants and converted the organic molecules into its own tissues. When the fox eats the prey animal, it is obtaining the energy stored in the prey's tissues.

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The distance between the 7th and the tenth second is 29.4 m.

We know that we can have to formulate the information that has been given here so as to obtain a proper progression and this would help us to get the common difference of the progression that we are looking at.

Now we know that the progression would look something like; 4.9, 14.7, 24.5 ....

We can see that this is an arithmetic progression that has a common difference of 9.8.

U7 = a + (n - 1)d

a = first term

n = Number of terms

d = common difference

U7 = 4.9 + (7 - 1) 9.8

= 63.7

U10 = 4.9 + (10 - 1) 9.8

U10 = 93.1

Between the 7th and 10th seconds, we have;

93.1 - 63.7

= 29.4 m

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Answer:

sum of the two forces as both point to the right is a force that points to the right,

Explanation:

The force on the cast load at point Y is given by

        F = q_y  E

force is a vector magnitude so its result is

        ∑ F = Fₐ + F_b

indicate that the charge at y is negative, we analyze the direction of the force created by each charge

Charge A

as the electric field is incoming the charge is negative and as the test charge is negative both repel each other, consequently the force points to the right

Charge B

in this case the electric field lines are salient, therefore the charge is positive, consequently the force on the charge at y is attractive and points to the right

the sum of the two forces as both point to the right is a force that points to the right, that is, in the direction of the charge located at B

Answer:

first

Explanation:

Newton's Newton's first law of motion states that for every action and there's an equal and opposite reaction

Answer:

D. Third

Explanation:

When the knob is rotated clockwise (cw), the channel 1 voltage increases while the channel 2 voltage decreases. This is because the knob controls the voltage divider network, which divides the input voltage between the two channels. As the knob is rotated clockwise, the resistance in the network decreases, allowing more of the input voltage to flow to channel 1 and less to channel 2.

Conversely, when the knob is rotated counterclockwise (ccw), the channel 1 voltage decreases while the channel 2 voltage increases. This is because the resistance in the voltage divider network increases, causing more of the input voltage to flow to channel 2 and less to channel 1.

It is important to note that the relationship between the channel 1 and channel 2 voltages is inversely proportional. This means that as one voltage increases, the other decreases, and vice versa. Additionally, the exact values of the voltages will depend on the input voltage and the resistance values in the voltage divider network.

Overall, understanding how the channel voltages change as the knob is rotated is essential for accurately measuring and analyzing signals in electronic circuits.

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Answer:

Nervous system and immune system

Explanation:

The nervous system is involved because you immediately jumped away, that ur brain and nerves initiating the fight or flight response. The immune system is involved because the tack most likely pierced your skin, so your immune system needs to work to make sure the wound does not get infected.

The tension in the cable is 156.8 N.

Weight of the sign board is mass × acceleration due to gravity

= 8 × 9.8 = 78.4 N

If T is the tension in the string, T× cos 60° is the vertical component of it.

Thus, we can conclude that the tension in the cable is 156.8 N.

Disclaimer: The question was given incomplete on the portal. Here is the complete question.

Question: A vendor hangs an 8.0 kg sign in front of his shop with a cable held away from the building by lightweight pole. The pole is free to pivot about the end where it touches the wall. What is the tension in the cable?

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Answer:

All its mass makes a combined gravitational pull on all the mass in your body.

Explanation:

Basically anything with mass has gravity

An alternative way to explain Hubble's Law without relying on the standard Big Bang idea of a universe with no center and no edge is through the concept of a "tired light" hypothesis.

According to this hypothesis, the redshift observed in distant galaxies is not due to their motion away from us in an expanding universe, but rather the result of photons gradually losing energy as they travel through space.

In the tired light scenario, the wavelength of light is thought to stretch over time due to interactions with matter or other unknown processes. As a result, the light from distant galaxies appears redshifted, mimicking the effect of cosmic expansion. This explanation implies that the universe may have a finite size and a center, challenging the notion of an infinite and uniformly expanding universe.

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Answer:

The speed is that it would take 121.05 seconds to run a kilometer.

Explanation:

Since there are 1000 meters in a kilometer, divide 400 meters by 4, and 48.42 by 4. Then you get 100 meters equals 12.105 seconds. Multiply that by ten, and you get 121.05 seconds

Finally, they rely on a variety of environmental cues such as the length of the day, the Sun's position and angle in the sky, water salinity and temperature gradients, and the Earth's magnetic field. They do this to navigate effectively.

Animal navigation refers to the ability of many animals to find their way around without the use of maps or instruments.

Birds like the Arctic tern, insects like the monarch butterfly, and fish like salmon migrate thousands of miles to and from their breeding grounds on a regular basis, and many other species navigate effectively over shorter distances.

Several animal species can use a variety of cues to help them orient and navigate effectively. Insects and birds can identify where they are and navigate by combining learned landmarks with sensed direction (from the earth's magnetic field or from the sky).

Thus, this is why an animal might use more than one type of clue to find its way.

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The equation F ≤ mg gives the vertical force he must apply to the pole. The magnitude of the force is 90.0 times the acceleration if the mass of the firemen is 90kg.

The given data is:

Mass of firemen = m

Acceleration = a

a.

There are two forces acting on the fireman. They are his weight (mg) acting downwards, and the force of friction (F) between the pole and the fireman acting upwards.

The fireman is sliding down the pole, and the force of friction must be less than the force of gravity acting toward the fireman or equal. Therefore, the equation giving the vertical force he must apply to the pole is,

F ≤ mg.

b.

If the fireman's mass is 90.0 kg and he accelerates at a rate of a.

The magnitude of his applied force can be calculated by:

a = F/m

To calculate the Forec, we can rearrange the equation as:

F = ma

F = (90.0 kg) x (a)

Therefore we can conclude that the magnitude of the force is 90.0 times the acceleration a.

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Answer:

60kg

Explanation:

F= ma

96 = m ×1.6

m= 96/1.6

=60 kg

An 8 AWG gray insulated neutral conductor is a type of wire that is commonly used in electrical systems. In this case, it is being used to supply a 120-volt electrical heater. The AWG (American Wire Gauge) refers to the thickness of the wire, and in this case, 8 AWG is a relatively thick wire that can handle a significant amount of electrical current.

The gray insulation on the wire is used to help identify it as the neutral conductor. The neutral conductor is an essential part of the electrical circuit, as it provides a path for the electrical current to return to the source. Without a neutral conductor, the circuit would not be complete, and the electrical device would not work.

Overall, the use of an 8 AWG gray insulated neutral conductor to supply a 120-volt electrical heater is a common and safe practice. It ensures that the electrical system is properly grounded and that the heater is receiving the appropriate voltage and current to operate safely and efficiently.

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Answer:

I can msg it toyou

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Explanation:

We have the next formula to calculate the kinetic energy

where m is the mass and v is the velocity

For the kinetic energy of ball 50 kg traveling at 10 m/s

For the kinetic energy of ball 50 kg traveling at 20 m/s

A 50 kg ball traveling at 20 m/s would have 4 times kinetic energy.

For kinetic energy of the ball 50 kg at 5m/s

A 50 kg ball traveling at 5 m/s would have 4 times less kinetic energy

For the person 50kg falling 10 m/s

A 50 kg person falling at 10 m/s would have the same kineticenergy}.

The solution is

A 50 kg ball traveling at 20 m/s would have 4 times more kinetic energy.

A 50 kg ball traveling at 5 m/s would have 4 times less kinetic energy.

A 50 kg person falling at 10 m/s would have the same kinetic energy.

Answer:

\( \huge{ \boxed{44 \: \: \text{inches}}}\)

Explanation:

To find the perimeter of the rectangle, we must first find the width of the rectangle given it's length and area then use it to find the perimeter of the rectangle.

Let the width be represented by w

Area of a rectangle = length × width

From the question.

Area = 105 sq. in

length = 7 in

\(105 = 7 \times w \\ 105 = 7w \: \: \: \: \: \: \\ \\ \frac{105}{7} = \frac{7w}{7} \\ w = 15\)

width = 15 in

Perimeter of a rectangle(p) = 2l + 2w

l is the length of the rectangle

w is the width of the rectangle

\(p = 2(7) + 2(15) \\ p = 14 + 30 \\ \\ p = 44\)

We have the final answer as

In conclusion, the light source in a fluorescence microscope is ultraviolet (UV) light, which is used to excite fluorophores and capture emitted light for imaging.

The light source in a fluorescence microscope is ultraviolet (UV) light. In this type of microscope, UV light is used to excite fluorophores, which are molecules that emit light of a different color when excited.
1. Fluorescence microscopes use UV light because it has a shorter wavelength than visible light, allowing for higher resolution imaging.
2. The UV light source emits a specific wavelength that matches the absorption properties of the fluorophores used in the sample.
3. When the UV light interacts with the fluorophores, they absorb the energy and enter an excited state.
4. The excited fluorophores then release the excess energy as light of a longer wavelength, typically in the visible range.
5. This emitted light is then captured by the microscope's objective lens and detected, producing an image.
In conclusion, the light source in a fluorescence microscope is ultraviolet (UV) light, which is used to excite fluorophores and capture emitted light for imaging.

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The maximum speed of the mass during its oscillations is 1.21 m/s (approx)

Mass (m) = 1.9 kg

Spring stiffness (k) = 180 N/m

Initial displacement (x) = 17.1 cm = 0.171 mInitial velocity (v) = 2 m/s

The maximum speed of the mass during its oscillations can be calculated using the formula:v_max = Aω

Where A is the amplitude of oscillations and ω is the angular frequency of oscillations.

Amplitude of oscillations can be calculated as:

A = x = 0.171 m

The angular frequency of oscillations can be calculated as:ω = √(k/m)

Where k is the spring constant and m is the mass of the object.ω = √(180/1.9) = 7.09 rad/s

Therefore, the maximum speed of the mass during its oscillations will be:

v_max = Aω = 0.171 × 7.09 = 1.21 m/s (approx).

Oscillation of a system can be defined as a type of motion that repeats itself after a regular interval of time. Simple harmonic motion is the type of oscillatory motion in which the motion is repeated after a fixed interval of time and this type of motion is found in a system in which the restoring force is directly proportional to the displacement of the object from the equilibrium position.

An oscillatory system can be created using a mass and spring arrangement. This arrangement is widely used in various mechanical systems such as suspension systems, shock absorbers, etc.

The maximum speed of the mass during its oscillations is equal to the product of amplitude of oscillations and angular frequency of oscillations.

The amplitude of oscillations is equal to the initial displacement of the mass from its equilibrium position and the angular frequency of oscillations is calculated using the formula, ω = √(k/m), where k is the spring constant and m is the mass of the object.

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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:

\(\vec{A} + \vec{B} = \vec{A} - \vec{B}\) if and only if \(\vec{B}\) is a zero vector.

Explanation:

An equation is true if and only if adding the same value to both sides of the equation (the value needs to be compatible) gives an equation that is also true.

Start with the \(\vec{A} + \vec{B} = \vec{A} - \vec{B}\).

This equation is true if and only if \(\left(\vec{A} + \vec{B}\right) + \vec{B} = \left(\vec{A} - \vec{B}\right) + \vec{B}\) (\(\vec{B}\) is added to both sides of the original equation.)

Vector addition and subtraction are associative. Therefore, \(\left(\vec{A} + \vec{B}\right) + \vec{B} = \left(\vec{A} - \vec{B}\right) + \vec{B}\) if and only if \(\vec{A} + \left(\vec{B} + \vec{B}\right) = \vec{A} + \left(- \vec{B} + \vec{B}\right)\), which is equivalent to \(\vec{A} + 2\, \vec{B} = \vec{A}\).

\(\vec{A} + 2\, \vec{B} = \vec{A}\) if and only if \(\left(-\vec{A}\right) + \vec{A} + 2\, \vec{B} = \left(-\vec{A}\right) + \vec{A}\) (\(\left(-\vec{A}\right)\)is added to both sides of this equation,) which is equivalent to \(2\, \vec{B} = \vec{0}\).

\(2\, \vec{B} = \vec{0}\) if and only \(\displaystyle \frac{1}{2} \cdot \left(2\, \vec{B}\right) = \frac{1}{2} \cdot \vec{0}\), which is equivalent to \(\vec{B} = \vec{0}\). That is: \(\vec{B}\) is the zero vector.

In other words:

\(\begin{aligned}& \vec{A} + \vec{B} = \vec{A} - \vec{B}\\ &\iff \left( \vec{A} + \vec{B}\right) + \vec{B} = \left(\vec{A} - \vec{B}\right) + \vec{B} \\ &\iff \vec{A} + \left(\vec{B} + \vec{B}\right) = \vec{A} + \left(- \vec{B} + \vec{B}\right) \\ & \iff \vec{A} + 2\, \vec{B} = \vec{A} \\ & \iff \left(-\vec{A}\right) + \vec{A} + 2\, \vec{B} = \left(-\vec{A}\right) + \vec{A} \\ &\iff 2\, \vec{B} = \vec{0} \\ &\iff \frac{1}{2} \cdot 2\,\vec{B} = \frac{1}{2} \cdot \vec{0} \\ &\iff \vec{B} = \vec{0}\end{aligned}\).

Hence, \(\vec{A} + \vec{B} = \vec{A} - \vec{B}\) if and only if \(\vec{B}\) is the zero vector.

We can see here that after turning on the light switch the level that you set the rheostat is to the lowest level.

A rheostat is a variable resistor that is used to control the amount of current flowing through a circuit. In a lighting circuit, the rheostat is used to control the brightness of the light.

When the rheostat is set to the lowest level, the most resistance is present in the circuit, which reduces the amount of current flowing through the light bulb. This results in a dimmer light.

As the rheostat is turned up, the resistance in the circuit decreases, which allows more current to flow through the light bulb. This results in a brighter light.

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