Which statement about conduction is true?
1. Conduction uses electromagnetic waves.
2. Conduction transfers energy from one particle to another
3. Conduction from a fireplace can heat an entire room.

Answer:

Less than 7.

Explanation:

pH scale in chemistry is used to measure the concentration of hydrogen ion. In other words, it is used to measure the extent of acidity or alkalinity of any solution. The pH scale having numbers that range from 0 to 14. The acidic solution has a lower pH value while the basic solution has a higher pH. The pH value of pure water is 7.

As the name implies acid rain, it is formed by the combination of sulfur and nitrogen oxides. The pH of acid rain is less than 7. Typically its value is 4.  

Answer:

They will interfere to create a crest with an amplitude of 0.

Explanation:

It is given that,

Wave A has an amplitude of 2, and wave B has an amplitude of 2. The superposition of two waves is called interference of wave. When the resultant wave have maximum amplitude is called constructive interference while when the amplitude of resultant completely destructs, the destructive interference happens.    

When the crest of wave A meets the trough of wave B, then destructive interference occurs. the phase difference will be 180°. There resultant is given by :

[tex]R=\sqrt{A^2+B^2+2ABcos(180)}[/tex]

R = A - B

Here A = 2 and B = 2

⇒ R = 0

Hence, the correct option is (a) "They will interfere to create a crest with an amplitude of 0".

The rotational kinetic energy of the sphere in a circular path (without spinning) is calculated using given parameters such as mass, radius, and angular speed, and the resultant rotational kinetic energy is approximately 227.03 Joules.

Answer

For the sphere, when it moves in a circular path without spinning, its rotational kinetic energy (K) is zero, because there's no internal rotation where the points in the body are moving through some angle due to spinning. However, if you are considering the entire motion of the system, then you could argue that there's rotational kinetic energy due to the rotation of the center of the circle. This is really a translational motion but in a circular path. The rotational kinetic energy can then be calculated using the equation, K = 1/2 (mr^2)w^2, where m is the mass of the sphere, r is the distance from the center of the circle to the center of the sphere, and w is the angular speed (not the angular velocity of the sphere itself if it was spinning). Lastly, substituting the known values: m=6 kg, r=1.8 m, and w=5.62 rad/s, we find that K = 1/2 * (6kg) * (1.8m)^2 * (5.62 rad/s)^2 = 227.0268 Joules.

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The rotational kinetic energy of the sphere is 30.03 Joules. This is calculated using the formula [tex]KE_{rot} = 0.5 \times I \times w^2[/tex], where I is the moment of inertia of the sphere and w is its angular speed.

To find the rotational kinetic energy of the sphere, we use the formula for rotational kinetic energy: [tex]KE_{rot} = 0.5 \times I \times w^2[/tex].

Where:

For a solid sphere, the moment of inertia is given by:

[tex]I = (2/5) \times m \times R^2[/tex]

Substituting the given values:

[tex]I = (2/5) \times 6 kg \times (0.89 m)^2\\I = (2/5) \times 6 kg \times 0.7921 m^2\\I = 1.901 kg\cdot m^2[/tex]

Now, using the angular speed w = 5.62 rad/s:

[tex]KE_{rot} = 0.5 \times 1.901 kg\cdot m^2 \times (5.62 rad/s)^2\\KE_{rot} = 0.5 \times 1.901 kg\cdot m^2 \times 31.5844 rad^2/s^2\\KE_{rot} = 30.03 J[/tex]

Therefore, the rotational kinetic energy of the sphere is 30.03 Joules.

A hazardous sign on a truck means that the load on the truck is potentially dangerous.

A hazardous sign on a truck means that the load on the truck is potentially dangerous. These signs are part of a system of hazard communication that includes symbols, labels, and placards to quickly and effectively convey information about the hazards of the materials being transported. The use of such signs is essential for the safety of everyone on the road, including the truck driver, other motorists, emergency responders, and the general public. It helps to ensure that appropriate precautions are taken when handling, transporting, and in the event of an accident involving, these materials.

Answer:

If an element has 10 electrons, 8 of them will be in the second energy level.

Explanation:

There are 7 energy levels, numbered from 1 to 7, and in which electrons are distributed, logically in order according to their energy level.

Each level is divided into sub-levels. These sub-levels into which each level is divided can be up to 4, which are called: s, p, d, f. In the sub-level s there can only be a maximum of 2 electrons, in p there can be a maximum of 6 electrons, in the sub-level d 10 electrons and finally in the sub-level f there can be a maximum of 14 electrons.

In level 1 there is only one sub-level, which will be the s. In level 2 there are 2 sub-levels, the s and the p. At level 3 there are 3 sub-levels s, p and d. And at level 4 there are 4 sub-levels, the s, the p, the d and the f.

Then, in level 1 there is only a maximum two electrons. In level 2 there are a maximum of 8 electrons. At level 3 there are a maximum of 18 electrons. And at level 4 there are a maximum of 32 electrons.

The filling of the orbitals occurs in increasing order of energy, that is, from the orbitals of lower energy to those of higher energy.

So, considering that at level 1 there can only be two electrons and that it is the lowest energy level, 2 of the 10 electrons that the element has will be located at that level. So 8 electrons remain to be located.

The next level to fill with electrons is 2. As this level can enter a maximum of 8 electrons, the electrons that remained to be located in level 1 will be located in level 2.

If an element has 10 electrons, 8 of them will be in the second energy level.

Answer: B.)by consuming plants

Explanation:

There is about 78% nitrogen is available in the atmosphere. But living beings such as plants does not absorb it directly from the air. Instead they absorb the compounds of nitrogen from the soil. The soil bacteria convert the nitrogen oxides into ammonia, nitrates and nitrites in the soil in this way these bacteria fix atmospheric nitrogen into the soil. The plants absorb these forms of nitrogen, which are essentially required for the synthesis of proteins and nucleic acids. Nitrogen as an element becomes essential ingredients in all biomolecules. We humans and animals eat plants and through them the usable form of nitrogen in the form of biomolecules enters the body.

Answer:

the correct answer is B. by consuming plants

Explanation:

Answer: The correct answer is D.      

Explanation:

The object weigh less on the moon than Earth. The weight of the object on the moon is one sixth the weight of the object on the Earth.

Greater the mass of the object, greater will be the gravitational force. Then more will be the weight of the object. The mass of the moon is less than the mass of the earth. The object weigh less on the moon than Earth.

As you go away from the Earth's surface, the weight of the object will get reduce.

An object in space closer to the moon than the earth.

Therefore, an object in space closer to the moon than the Earth would weigh the least.

What best describes Latitude is ;  The measure of the angular distance North and south of the equator at zero degrees

Latitude lines are horizontal lines which measures the angular distance north and south of the equator which is set at zero degrees, the latitudes measures the distance between th north pole and the south pole of the earth.

Hence we can conclude that What best describes Latitude is ;  The measure of the angular distance North and south of the equator at zero degrees.

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Answer:

The correct answer is "is directed toward the center of motion".

Explanation:

When an object moves in a uniform circular motion, the centrifugal acceleration of the object is directed toward the center of the motion. This acceleration is the only acceleration of the object experiences when it has constant velocity on a circular path. This causes the body to be attracted to the center of the trajectory by a centripetal force that prevents the body from entering a rectilinear trajectory.

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(a) The final angular velocity [tex](\(\omega_2\))[/tex] of the neutron star is approximately [tex]\(1.42 \times 10^{-5}\)[/tex] rad/s.

(b) The final angular velocity [tex](\(\omega_2'\))[/tex] of the neutron star is approximately [tex]\(3.54 \times 10^{-6}\)[/tex] rad/s.

**(a) Assume that the thrown-off mass carries off no angular momentum:**

1. Calculate the initial moment of inertia [tex](\(I_1\)):[/tex]

[tex]\[I_1 = \frac{2}{5} \cdot (8 \cdot \text{mass of the Sun}) \cdot (\text{radius of the Sun})^2\][/tex]

  The mass of the Sun is approximately [tex]\(2 \times 10^{30}\)[/tex] kg, and the radius of the Sun is approximately 6.96 x [tex]10^8[/tex] meters. Calculate [tex]\(I_1\): \[I_1 = \frac{2}{5} \cdot (8 \times 2 \times 10^{30} \text{ kg}) \cdot (6.96 \times 10^8 \text{ m})^2\][/tex]

  This gives [tex]\(I_1 \approx 3.06 \times 10^{40}\) kg m^2.[/tex]

2. Calculate the initial angular velocity [tex](\(\omega_1\)):[/tex]

  The rotation period is 12 days, which is equivalent to [tex]\(12 \times 24 \times 60 \times 60\)[/tex] seconds. Calculate

[tex]\(\omega_1\): \[\omega_1 = \frac{2\pi}{12 \times 24 \times 60 \times 60} \text{ rad/s}\][/tex]

  This gives [tex]\(\omega_1 \approx 1.99 \times 10^{-7}\) rad/s.[/tex]

3. Calculate the initial angular momentum [tex](\(L_1\)): \[L_1 = I_1 \cdot \omega_1 = (3.06 \times 10^{40}\, \text{kg·m²}) \cdot (1.99 \times 10^{-7}\, \text{rad/s})\][/tex]

  This gives [tex]\(L_1 \approx 6.11 \times 10^{33}\) kg m^2/s.[/tex]

4. Calculate the final moment of inertia [tex](\(I_2\)):[/tex]

  The final radius of the neutron star is 12 km, which is equivalent to 12,000 meters. Calculate [tex]\(I_2\):[/tex]

[tex]\[I_2 = \frac{2}{5} \cdot (3/4 \cdot \text{mass of the Sun}) \cdot (12,000 \text{ m})^2\] \[I_2 = \frac{2}{5} \cdot (3/4 \cdot 2 \times 10^{30}\, \text{kg}) \cdot (12,000\, \text{m})^2\][/tex]

  This gives [tex]\(I_2 \approx 4.32 \times 10^{38}\)[/tex] kg·m².

5. Use the conservation of angular momentum [tex](\(L_1 = L_2\))[/tex] to find the final angular momentum [tex](\(L_2\)): \[L_2 = L_1 = 6.11 \times 10^{33}\, \text{kg·m²/s}\][/tex]

6. Calculate the final angular velocity [tex](\(\omega_2\))[/tex] of the neutron star:

[tex]\[\omega_2 = \frac{L_2}{I_2} = \frac{6.11 \times 10^{33}\, \text{kg·m²/s}}{4.32 \times 10^{38}\, \text{kg·m²}}\][/tex]

  This gives [tex]\(\omega_2 \approx 1.42 \times 10^{-5}\)[/tex] rad/s.

**(b) Assume that the thrown-off mass carries off its proportional share (3/4) of the initial angular momentum:**

1. Calculate the final angular momentum [tex](\(L_2'\))[/tex] considering that 3/4 of the initial angular momentum is carried away by the mass that is thrown off during the collapse:

[tex]\[L_2' = (1 - \frac{3}{4}) \cdot L_1 = (1 - 0.75) \cdot 6.11 \times 10^{33}\, \text{kg·m²/s}\][/tex]

  This gives [tex]\(L_2' \approx 1.53 \times 10^{33}\, \text{kg·m²/s}\).[/tex]

2. Calculate the final angular velocity [tex](\(\omega_2'\))[/tex] of the neutron star:

[tex]\[\omega_2' = \frac{L_2'}{I_2} = \frac{1.53 \times 10^{33}\, \text{kg·m²/s}}{4.32 \times 10^{38}\, \text{kg·m²}}\][/tex]

  This gives [tex]\(\omega_2' \approx 3.54 \times 10^{-6}\)[/tex] rad/s.

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A satellite in an elliptical orbit around Earth moves slowest at its apogee, which is the point farthest from the Earth, due to the weaker gravitational force and conservation of angular momentum.

An earth satellite in an elliptical orbit travels slowest when it is at the point farthest from the Earth, known as the apogee.

In an elliptical orbit, satellites experience varying speeds. The speed is greatest at the point closest to Earth, called perigee, and lowest at the apogee. This is due to the conservation of angular momentum and energy: while the gravitational pull is strongest at the perigee resulting in higher velocity, it is weakest at the apogee, hence causing the satellite to move slower.

Orbital dynamics, such as the one described, are dictated by Kepler's laws of planetary motion where among others, it states that a planet or satellite will sweep out equal areas in equal times, leading to a change in speed depending on its position along the orbit. Thus, as a satellite moves away from the Earth, to the apogee of its orbit, its orbital speed decreases due to the weaker gravitational force at that point.

Final answer:

The diver's potential energy relative to the water surface, calculated using the formula PE = mgh with given values, is 2058 Joules.

Explanation:

To calculate the diver's potential energy relative to the water surface, we use the formula for gravitational potential energy, which is PE = mgh, where PE is the potential energy, m is the mass of the object, g is the acceleration due to gravity (approximately 9.8 m/s2), and h is the height above the reference point (in this case, the water surface).

Given a diver with a mass of 70.0 kg standing 3.0 m high above the water, the calculation would be as follows:

PE = (70.0 kg) * (9.8 m/s2) * (3.0 m) = 2058 Joules.

Therefore, the diver's potential energy relative to the water surface is 2058 Joules.

Increasing the distance between two objects decreases the gravitational force between them because the force is inversely proportional to the square of the distance.

According to the equation fg = G m1 m2 / d2, when examining the gravitational force (fg) between two objects, we look at two key factors: the product of their masses (m1 and m2) and the square of the distance between them (d2). The gravitational force is directly proportional to the product of their masses, meaning if the masses increase, the force increases. However, it is inversely proportional to the square of the distance between them, meaning if the distance (d) increases, the gravitational force decreases.

To illustrate this principle, if the distance between two objects is increased, the gravitational force between them decreases. This is because the force diminishes with the square of the distance increase, which is demonstrated by the 1/d2 factor in the equation. For example, if you increase the distance by a factor of 3, the gravitational force would decrease by a factor of 32 (or 9).

Therefore, as the distance between two objects increases, the gravitational force between them will indeed decrease, highlighting the importance of distance when considering gravitational interactions.

On Edge, the answer is D.