Which of the following statements is true?

Solar eclipses are safe to look at without special equipment.
The International Date Line runs through Greenwich, England.
New days begin at 180° longitude.
Earth's orbit is a perfect circle.

The best choice that explains the definition of a variable is, a variable is something that can change and may affect the outcome in a scientific investigation. Option 2 is correct.

In scientific investigations, a variable is a factor or condition that can be changed or varied, and may have an effect on the outcome of the investigation. Variables are often classified into independent, dependent, and controlled variables. The independent variable is the factor that is intentionally changed by the researcher to observe its effect on the dependent variable, which is the factor that is being measured or observed.

While the other choices are related to scientific investigations, they do not accurately define what a variable is. A variable is a factor or condition that can change and potentially affect the outcome of an experiment or scientific investigation. Option 2 is correct.

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Answer:

Increase the number of loops in the coil.

Explanation:

Base on the scenario been described in the question, if the student wishes to increase the make the electromagnetic greater, the student should Increase the number of loops in the coil. By so doing, the electromagnetic force will be greater

Answer: Healthy Criticism

Explanation:

Answer:

intellectual curiosity

Explanation:

Answer:

m1=100kg

m2=6×10^24kg

r=6400km

G=6.6×10^-11

F=?

as we know that

F=G m1.m2/r²

F=6.6×10^-11×100×6×10^24/(6400)²

F=6.6×10^-11×6×10^26/4.096×10^7

F=6.6×10^-11×1.465×10^19

F=9.67×10^8N

Answer:

c, 25,100 J

Explanation:

edge2o2o

Refrigerant oil boiling pressure The boiling pressure of refrigerant oil is determined by the temperature of the system. This temperature varies depending on the pressure exerted on the oil. The refrigerant oil will boil at a different temperature for each refrigerant.

The boiling point of refrigerant oil can be estimated by determining the boiling pressure at a certain temperature of the system. The approximate boiling pressure of refrigerant oil in a system ranges from 20 to 30 psig. However, this value may vary depending on the type of refrigerant used in the system. The refrigerant oil can also be changed depending on the type of refrigerant used in the system.The type of refrigerant used in the system will also affect the boiling pressure of refrigerant oil. A refrigerant is a substance that changes from a liquid state to a gaseous state at a specific temperature. It is used in refrigeration systems to transfer heat from one location to another. The refrigerant oil is added to the system to ensure that all parts of the system are lubricated. This prevents the parts from grinding together and causing damage.

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Explanation:

Glass is the best sound absorber material.

The wave is traveling in the -z-direction.

Given:

ex=e0cos(kz+ωt),ey=ez=0.

What is the answer of Part A?

If we write the argument of the cosine function as,

kz + ωt = K (z + ct)

we see that the wave is traveling in the -z-direction.

Because E and B are perpendicular to each other and to the direction of propagation, and E is in the x-direction, B can have only y-component, with magnitude \(B_{0}\) = \(E_{0}\)/C

Thus, the wave is traveling in the -z-direction.

What is the answer of Part B?

Since,   \(E_{0}\) = C\(B_{0}\)

            \(B_{0}\) = \(E_{0}\)/C

What is the answer of Part C?

Ex- B, and V must be perpendicular to each other. So, B must be along the y-axis. Also, V is in x-z. So, B will be along -y-axis.

∴ex=e0cos(kz+ωt),ey=ez=0.

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The effect in which white light separates into different colors is called dispersion, typically observed when light passes through a prism or water droplets.

Dispersion is the process by which white light is broken down into its individual colours. This phenomenon happens when light travels through a material that, depending on the light's wavelength, bends or refracts it at various angles.

This causes the white light to break up into a rainbow of colours when different colours of light bend at various angles. This effect may be seen in natural phenomena like rainbows and halo, but it is most frequently seen when light travels through a prism.

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Answer:

14.96 amps

Explanation:

Answer:

1500 kg is mass of car

Explanation:

F = ma

F/a = m

4500n / 3 m/s^2 = 1500 kg

Answer:

A model is a simplified version of a system

Explanation:

A model is the representation of a real object, or natural phenomenon that aims to show the real object or phenomenon looks like and the manner of operation, or how the a system or phenomenon works. A model can thus be used for testing and or research

The model of a real life object is generally smaller than the object and it is assumed that within given correctional factors, the property of a model and the real object are identical in the same environmental conditions.

Answer: the answer is A.

Explanation:

brainliest please?

Answer:

A.

Cognition helps determine if a consequence is influential enough to control behavior.

Explanation:

This is right on edg. 2020

Answer: 65 ohm

Explanation:

Your weight on the moon given the data from the question is 110.5 N

Mass is simply defined as the quantity of matter present in an object. The mass of an object is constant irrespective of the location of the object.

Weight is simply defined as the gravitational pull on an object. The weight of an object varies from place to place due to gravity.

Mass and weight are related according to the following equation

Weight (W) = mass (m) × Acceleration due to gravity (g)

W = mg

W = 65 × 1.7

W = 110.5 N

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Correct option is:- C) Work is a measure of how much energy a force transfers.

Answer:

Mined materials are needed to construct roads and hospitals, to build automobiles and houses, to make computers and satellites, to generate electricity, and to provide the many other goods and services that consumers enjoy.

Explanation:

Answer:

the density is 0.301 :)

Answer:

important – mass, and distance.

Answer:

the top with the largest radius because the radius of curvature is inversely proportional to the angular velocity

Explanation:

Angular and linear velocity are related

         v = w r

         w = v / r

Therefore, if the linear velocity of the two is the same, the one with the smaller radius has the higher angular velocity.

When reviewing the answers, the correct one is:

the top with the largest radius because the radius of curvature is inversely proportional to the angular velocity

The top that has a smaller angular velocity is D. the top with the larger radius because the radius of curvature is directly proportional to the angular velocity.

It should be noted that the top that has a higher angular velocity will be the top with the smaller radius because the radius of curvature is inversely proportional to the angular velocity

On the other hand, since the two spinning tops have different radii while both have the same linear instantaneous velocities at their edges, then the top that has a smaller angular velocity is the top with the larger radius because the radius of curvature is directly proportional to the angular velocity.

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Monochromatic light falls on a slit that is 2.60 10-3 mm wide. If the angle between the first dark fringes on either side of the central maximum is 37.0° (dark fringe to dark fringe), the frequency of the light used in THz  194 THz

To determine the frequency of the monochromatic light in terahertz (THz), we can use the concept of interference and the equation relating the fringe spacing to the wavelength of light. The first dark fringe on either side of the central maximum is created due to destructive interference when the path lengths from the two edges of the slit to a point on the screen differ by half a wavelength.

The fringe spacing, denoted by "d," can be calculated using the following equation:

d = λ / sin(θ)

where λ is the wavelength of light and θ is the angle between the first dark fringes on either side of the central maximum.

Given that the angle θ is 37.0° and the width of the slit is 2.60 × 10^(-3) mm, we can convert the slit width to meters:

Slit width (w) = 2.60 × 10^(-3) mm = 2.60 × 10^(-6) m

Now we can rearrange the equation to solve for the wavelength:

λ = d × sin(θ)

Plugging in the values:

λ = (2.60 × 10^(-6) m) × sin(37.0°)

Calculating this expression, we find:

λ ≈ 1.55 × 10^(-6) m

Finally, to convert the wavelength to terahertz, we use the speed of light formula:

c = f × λ

where c is the speed of light (approximately 3 × 10^8 m/s) and f is the frequency in hertz.

Rearranging the equation to solve for frequency:

f = c / λ

Plugging in the values:

f = (3 × 10^8 m/s) / (1.55 × 10^(-6) m)

Calculating this expression, we find:

f ≈ 1.94 × 10^14 Hz

To express the frequency in terahertz, we divide the frequency by 10^12

f ≈ 194 THz

Therefore, the frequency of the monochromatic light used is approximately 194 terahertz (THz).

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Answer:

The triple point for carbon dioxide is -70°F (-57ºC) at 5.2 atm.

Explanation:

5.2 atm is 5.2 times the air pressure at sea level, the reason why this is included is because liquid CO² cannot exist below 5.2 atm, as if it were lower it would evaporate due to submilation.

Although the temperature of the triple point of carbon dioxide is -70°F (-57ºC), the pressure present is around 5. 2 atmospheres.

Carbon dioxide can adopt all three states of matter - solid, liquid, and gas - at a precise configuration of pressure and temperature. The triple point is a precise state in which the three phases exist simultaneously and are in balance.

If the triple point conditions are not obeyed, carbon dioxide may go through changes in its physical state, such as transforming into a gas or a liquid, which will be determined by fluctuations in temperature and pressure.

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Answer:

The magnetic effect of electric current is known as electromagnetic effect. :)

Explanation:

the magnetic effect which is connected with electricity is called magnetic effect of current.

Product or Satisfaction rating using number of stars is a a qualitative or categorical variable which falls under the Ordinal variable classification.

Therefore, use of star rating to depict online customer satisfaction is a categorical Ordinal variable.

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In orbit around the earth, an astronaut's mass is the same and his weight is less than what it would be on earth.

This is due to the difference in gravitational force between the earth's surface and the orbiting spacecraft. Weight is a measure of the force of gravity acting on an object, while mass is a measure of the amount of matter in an object. Since the gravitational force decreases with distance from the center of the earth, objects in orbit experience a weaker gravitational force compared to objects on the earth's surface. As a result, the weight of an astronaut in orbit is less than his weight on earth. However, since mass is a measure of the amount of matter in an object and is independent of the gravitational force, an astronaut's mass remains the same in orbit as it would be on earth.

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Answer: It has the skill to nest

sorry if I'm wrong

Answer:

B: A colorful beak

Explanation:

i hope this helped!

Take into account that the heavy man weighs more than light woman. It means that heavy man experiences a greater acceleration and then, he increases his speed more rapidly.

Consider that air resistance depends on different factors, and one of them is the speed of the object. The state of zero acceleration is reached when the force of gravity equals the air resistance force. In this case, the air resitance force reaches it maximum in equal times for both heavy man and light woman.

Althoug the light woman is less masive, the magnitude of the air resistance is lower and then it requires less time to reach the equilibrium. The air resistance force on te heavy man has a greater magnitude, however, the man accelerates more rapidly and then the time for the equilibrium is compensated.

Hi there!

We can use the work-energy theorem to solve.

Recall that:
\(E_i = E_f\)

The initial energy equals the final energy (Conservation of Energy). However, we must take into account energy dissipated due to friction in this instance.

The energy lost due to friction is equivalent to the work done by friction. Recall the following:

The work due to a force is:
\(W = F \cdot d \\\)

Since the displacement is in the same direction as the force, the dot-product becomes Fd.

The work due to friction then becomes:

\(W_f = \mu mgdcos\theta\)
The work due to friction is SUBTRACTED from the initial potential energy.

Initial energy = GPE = mgh

Final energy = KE

Therefore:

\(\boxed{mgh - \mu mgdcos\theta = KE}\)

Answ

— How can a small boy balance a big boy on a sea-saw? Show with a diagram. fast please...... Get the answers you need, now!

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Explanation: