what is lighting effect of current electricity​
help me

Option b. I and II only.During the process of freezing, energy is released (statement I), and the heat transfer is greater than zero (statement II).

I. H2O(l) > H2O(s) + energy:

This statement is true. When water freezes, it transitions from a liquid state (H2O(l)) to a solid state (H2O(s)). The process of freezing is exothermic, meaning it releases energy. The energy released during freezing is known as the latent heat of fusion.

II. Q > 0:

This statement is also true. The symbol "Q" represents the heat transfer during a process. In the case of freezing water, heat is transferred out of the system (water) into the surroundings. Since freezing is an exothermic process, Q, the heat transfer, is greater than zero.

III. Molecular attractions are weakened:

This statement is false. When water freezes, the molecular attractions between water molecules become stronger, not weaker. As the temperature decreases, the kinetic energy of the water molecules decreases, and they arrange themselves in a more ordered structure. This leads to the formation of hydrogen bonds, which are stronger than the intermolecular forces present in liquid water.

In conclusion, statements I and II are true about freezing water. Statement III, however, is false. During the process of freezing, energy is released (statement I), and the heat transfer is greater than zero (statement II). Additionally, the molecular attractions between water molecules become stronger, not weaker, as the water transitions from a liquid to a solid state.

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The energy absorbed by Hydrogen atom to transit an electron from n = 3 to n = 6 is 1.815x10-19 Joules

Energy Level: According to the Bohr atomic model, energy levels—also known as electron shells—are thought of as the orbits that electrons in an atom's nucleus take. Electrons must always be in one of the energy levels and never in the space between them since the energy levels represent defined distances.

According to the given information

Change in energy = \(-13.6eV \frac{1}{n_{f} ^{2} }-\frac{1}{n_{i} ^{2} }\)

                              = -13.6 × 1.6 × \(10^{-19}\) ( \(\frac{1}{6^{2} }\) - \(\frac{1}{3^{2} }\) )

                              = 21.76 × \(10^{-19}\) × 0.084

                              = 1.815 × \(10^{-19}\) J

Change in Energy level = 1.815 × \(10^{-19}\) J

The energy absorbed by Hydrogen atom to transit an electron from n = 3 to n = 6 is 1.815x10-19 Joules

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The second plane started at 3:30 P.M.t = (300/D) + (6/5)Second plane overtakes after t hours after 3:30 P.M.

Hence, the time taken to overtake will be 5:30 P.M.

The second plane overtook the first plane at 5:30 P.M. (local time).Explanation:

Given,

At 3 P.M. a plane left Kennedy Airport for Los Angeles traveling at 600 m.p.h. At 3:30 P.M. another plane left the same airport on the same route traveling at 650 m. p. h. To find:

Let the distance traveled by both planes until they meet be D. At 3:00 P.M. the first plane has traveled for 0.5 hours. Then the distance covered by it is D1 = 0.5 * 600 = 300 miles. At 3:30 P.M. the second plane has started, but it is behind the first plane by D1 miles. So, the relative speed between the planes is 650 - 600 = 50 mph.When the second plane overtakes the first, they both will have covered the same distance (D). Let us calculate the time it takes for the second plane to reach that distance.

The relative speed of the planes is 50 mph. Thus, 50 * t = D Substitute D = 300 + D in the above equation to find the value of t.50t = 300 + Dt = (300/D) + (6/5)At

To find that, we need to add the above value of t to the time at which the second plane started. The second plane started at 3:30 P.M.t = (300/D) + (6/5)Second plane overtakes after t hours after 3:30 P.M.

Hence, the time taken to overtake will be 5:30 P.M.

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Answer:

11×10⁵ J

Explanation:

From the question given above, the following data were obtained:

Mass (m) = 1000 kg

Height (h) = 110 m

Acceleration due to gravity (g) = 10 m/s²

Potential energy (PE) =?

The potential energy of the roller coaster can be obtained as follow:

PE = mgh

PE = 1000 × 10 × 110

PE = 11×10⁵ J

Therefore, potential energy of the roller coaster is 11×10⁵ J

Answer:

When you burned the skewer tip coated with sodium chloride, you should have seen that the flame was pure yellow-orange (without any blue). This is because when the metal sodium is burned, it makes intense yellow-orange light. ... This is because when the metal copper is burned, it makes bluish-green light.

hope this helps

Two locomotives approach each other on parallel tracks. Each has a speed of v with respect to the ground. When two trains are travelling towards each other, the effective speed at which they are approaching is the sum of their velocities.

This is since the distance between them is decreasing at the pace of the sum of their speeds. Since the two trains are travelling at the same speed, we can say that they are moving towards each other at a combined speed of 2v. Since the initial distance between them is 8.5 km, the time it takes for them to meet can be calculated by dividing the initial distance by the combined speed.

Therefore,time required = 8.5 km / 2v. If we want to express the time in terms of hours, we must first convert the distance from kilometres to metres and the speed from km/h to m/s.1 km = 1000 m 1 h = 3600 sSo, 8.5 km = 8500 m and v km/h = (1000 v)/3600 m/sHence, the time required = 8500 m / (2 (1000 v)/3600 m/s)) = (15/2) (v/c) seconds, where c is the speed of light. Therefore, the two locomotives will meet in (15/2) (v/c) seconds.

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Answer:

dryer, scissors, ramp, axe, metal detector, rake, stairs, lid, soccer ball, and egg beater

Explanation:

btw its in that exact order plz make me brainliest

The type of simple machines which are shown in the following image include the wheel and axle, pulley, inclined plane, screw, wedge, and lever.

A simple machine is a mechanical device which is responsible for the changes in the direction or magnitude of a force. In general, simple machines can be defined as the simplest mechanisms which can use mechanical advantage to multiply force.

Simple machines which are widely used in daily works include the wheel and axle, pulley, inclined plane, screw, wedge, and lever.

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The claim that there is at least one number that is three greater than twice its fifth power can be proven using the Intermediate Value Theorem.

To apply the Intermediate Value Theorem, we need to show that the function f(x) = \(2x^5\)+ 3 is continuous on a closed interval [a, b] and takes on both positive and negative values.

1. Continuity:

The function f(x) = \(2x^5\) + 3 is a polynomial function, and polynomial functions are continuous for all real numbers. Therefore, f(x) is continuous on the entire real number line.

2. Positive and Negative Values:

To show that f(x) takes on both positive and negative values, we can consider the limits of f(x) as x approaches positive and negative infinity:

- As x approaches positive infinity, the term \(2x^5\) dominates the function, and f(x) approaches positive infinity.

- As x approaches negative infinity, the term \(2x^5\) dominates the function, and f(x) approaches negative infinity.

Since f(x) approaches both positive and negative infinity as x approaches infinity and negative infinity respectively, it must take on all values in between, including positive and negative values.

By the Intermediate Value Theorem, since f(x) is continuous on the real number line and takes on both positive and negative values, there must exist at least one number c for which f(c) = 0. In other words, there is at least one number that is three greater than twice its fifth power.

In conclusion, by satisfying the hypotheses of the Intermediate Value Theorem, we can prove the claim that there is at least one number that is three greater than twice its fifth power.

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Answer:

\(\huge\boxed{\sf F= 350 \ N}\)

Explanation:

Considering pivot as the central point,

Key:

\(F_1r_1=F_2r_2\)

Here,

Substitute the givens in the above formula.

\(F(1.2)=600(0.7)\\\\F(1.2)=420\\\\Divide \ 1.2 \ to \ both \ sides\\\\F=420/1.2\\\\F= 350 \ N\\\\\rule[225]{225}{2}\)

Hello!

We can use Ohm's Law to solve for the potential difference across a resistor given the current and resistance:

\(V = iR\)

V = Potential Difference (? V)
i = Current (1.5 A)

R = Resistance (12 Ω)

Plug in the known values and solve.

\(V = (1.5)(12) = \boxed{18 V}\)

Microwaves are used for heating because they are able to quickly and evenly heat food items without the need for a physical contact source, like a sand bath.

The microwave uses electromagnetic radiation to excite the water molecules in the food, which then generate heat. This process is much faster and more efficient than heating with a sand bath, as the heat source is more evenly distributed throughout the food item. On the other hand, a sand bath uses conduction to transfer heat, which can be slower and less consistent in comparison. Additionally, microwaves offer more precise temperature control, allowing for specific heating times and power levels to be set for different food items. Overall, the convenience and speed of the microwave make it the preferred method for heating food in most situations.

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Answer:

below

Explanation:

To find dx we can use this formula :

     dx = Vx(t)

     dx = 4.33m/s (9.11)

     dx =39.4463 m

     dx = 39.4 m

Hope this helps!

Answer:

here's the answers!

Explanation:

A mover carries a box up a flight of stairs.

A mover carries a box across a room.

A weightlifter lifts a barbell off the ground.

hope it helps u!

Answer:

A, D, E

Explanation:

Did it

1.25m

hope this is what you needed

On analysis of the figure

1)- B, D

2. B , D

3. A, , C At bath position :- acceleration due to centripetal gravity - acceleration. Hence; net acceleration is zero.

When a point or object accelerates or decelerates, it is moving forward directly. While moving at the same speed, a circle moves faster because its direction is constantly shifting. All of these effects hasten the progress of every other movement.Acceleration is a vector quantity since it has both a magnitude and a direction. A vector quantity is also velocity. The change in velocity vector during a time interval divided by the time interval is the definition of acceleration. The instantaneous acceleration is given by the upper bound of the ratio of the change in velocity during the instantaneous period (at a certain time and location).

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IF all the pairs are separated by the same distance, then it's the car and the bowling ball.

If I can move them as far apart as I want, then I can make ANY of them have the greatest gravitational attraction between them.

A significant amount of energy comes to Earth from the sun every year, not all of it can be used to meet our energy needs. This is because the amount of energy that can be converted into usable forms (electricity or heat) is limited by the technology we currently have available.

The 5.6x10^21 kJ of energy from the sun indeed provides an immense amount of energy to Earth every year. However, we cannot use this energy to meet all of our energy needs due to several factors, such as:
1. Inefficiency in energy conversion: Current solar technologies cannot convert all the incoming sunlight into usable electricity, resulting in a significant amount of energy loss.
2. Uneven distribution: Sunlight is not evenly distributed across the Earth's surface, leading to varying levels of solar energy availability.
3. Storage challenges: Solar energy production is intermittent, which requires efficient storage solutions to provide a consistent energy supply, and current storage technologies are still improving.
4. Infrastructure and investment: Transitioning to a solar-powered society requires large investments in infrastructure and technology, which can be challenging for many regions.

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Answer: In the Newton's ring experiment, the diameter of the 4th dark ring is 0.30 cm and the diameter of the 10th dark ring is 0.62 cm. We can use this information to find the diameter of the 15th dark ring and calculate the wavelength of the light.

Explanation:

In the Newton's ring experiment, the diameter of the 4th dark ring is 0.30 cm and the diameter of the 10th dark ring is 0.62 cm. We can use this information to find the diameter of the 15th dark ring and calculate the wavelength of the light.

a) To find the diameter of the 15th dark ring, we can use the formula for the diameter of the nth dark ring:

d_n = sqrt(n * λ * R)

where d_n is the diameter of the nth dark ring, n is the order of the ring, λ is the wavelength of the light, and R is the radius of curvature of the lens.

Since we want to find the diameter of the 15th dark ring, we can substitute n = 15 into the formula and solve for d_15:

d_15 = sqrt(15 * λ * R)

b) To calculate the wavelength of the light, we can use the formula:

λ = (\(d_10^2 - d_4^2\)) / (\(10^2 - 4^2\))

where d_10 is the diameter of the 10th dark ring and d_4 is the diameter of the 4th dark ring.

Substituting the given values, we have:

λ = (\(0.62^2 - 0.30^2\)) / (\(10^2 - 4^2\))

Simplifying this expression will give us the value of the wavelength of the light used in the experiment.

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When you sit in your desk chair, the reaction force to your weight is the normal force from the chair, which is a true statement. Suppose that a book is sliding against a rough table, then a constant force is needed to maintain its velocity, which is also a true statement.

The normal force is an example of the contact force, which is the force that arises when two objects are in physical contact with each other. It acts perpendicular to the surface of contact and opposes the force of gravity.The force of friction acts against the relative motion of the surfaces in contact, and the net force is the difference between the two opposing forces.

When a book is sliding on a rough table, a force is needed to balance the force of friction acting on it so that its velocity can be maintained at a constant level. The book's velocity decreases over time if the force applied is less than the force of friction on the book. If the force applied is greater than the force of friction on the book, its velocity increases over time. Therefore, a constant force is needed to maintain its velocity

.According to Newton's laws of motion, a body remains at rest or in uniform motion in a straight line unless acted upon by an external force. A constant force is required to maintain uniform motion in the absence of any external force acting on the body.

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The amount of energy needed to raise the temperature of 1 gram of a substance by 1 degree Celsius

Answer:

To find the work done in moving the particle from the origin to x = 2, we need to integrate the force over the given interval.

The work done (W) is calculated by integrating the force function with respect to displacement (dx) from the initial position (0) to the final position (2):

W = ∫(0 to 2) (10x³ - 5) dx

Integrating the force function, we get:

W = ∫(0 to 2) (10x³ - 5) dx = [2.5x⁴ - 5x] evaluated from 0 to 2

Now, substituting the upper limit (2) and lower limit (0) into the equation:

W = [2.5(2)⁴ - 5(2)] - [2.5(0)⁴ - 5(0)]

 = [2.5(16) - 10] - [0 - 0]

 = 40 - 10

 = 30

Therefore, the work done in moving the particle from the origin to x = 2 is 30 units of work.

Explanation:

At a fixed location, the phase changes by 55.04 radians during a time interval of 0.01 s.

First use the formula to find the wavelength of the wave:

wavelength = speed/frequency

Use the fact that the speed of a wave is related to its wavelength and frequency by the formula:

speed = wavelength x frequency

Rearrange this to get:

wavelength = speed/frequency

Now find the speed. Use the fact that the wave has a frequency of 880 Hz to find the wavelength using the formula:

speed = wavelength x frequency

speed = wavelength x 880

Use the given information that the difference in phase between two positions is π/3 radians.

The difference in phase between two positions is related to the difference in distance between those positions by the formula:

phase difference = 2π(distance difference)/wavelength

Rearrange this formula to get:

distance difference = wavelength(phase difference)/(2π)

Now substitute in the values:

distance difference = (speed/frequency)(π/3)/(2π)

Simplifying this expression gives:

distance difference = speed/(6frequency)

Find the speed to answer part (a). Using the earlier equation that relates speed, wavelength, and frequency:

speed = wavelength x frequency

substitute in the frequency and rearrange to get:

wavelength = speed/frequency

wavelength = (speed)/(880 Hz)

Use the given information in part (b) to find how much the phase changes during a time interval of Δt = 0.01 s.

The phase of a traveling wave changes over time according to the formula:

phase change = 2π(frequency)(time interval)

Substituting the given values gives:

phase change = 2π(880 Hz)(0.01 s) = 55.04 radians

Therefore, at a fixed location, the phase changes by 55.04 radians during a time interval of 0.01 s.

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The exact position of an electron cannot be known. Instead, we can calculate the probability that an electron is in a specific area based on electron cloud model.

The electron cloud model is a model of an atom in which the atom consists of a small but massive nucleus surrounded by a cloud of rapidly moving electrons.

The electron cloud model says that we cannot know exactly where an electron is at any given time, but the electrons are more likely to be in specific areas.

Thus, the exact position of an electron cannot be known. Instead, we can calculate the probability that an electron is in a specific area based on electron cloud model.

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Answer:

Density = 2.66 g/cm³

Explanation:

Density = Mass / Volume

Since, the units are same as of kg/m³

==> Density = 400 / 150

==> Density = 2.66

Density = 2.66 g/cm³

\(\\ \sf\longmapsto Density=\dfrac{Mass}{Volume}\)

\(\\ \sf\longmapsto Density=\dfrac{400}{150}\)

\(\\ \sf\longmapsto Density=2.6g/cm^3\)

The binding energy per nucleon of the 16O nucleus is 15.713375 amu.  

The binding energy of a nucleus is the energy required to separate the nucleus into its constituent protons and neutrons. The binding energy per nucleon (B.E. / N) is the binding energy of a nucleus divided by the number of nucleons in the nucleus.

The binding energy of a nucleus can be calculated using the following formula:

binding energy = mass of nucleus - (mass of nucleon) x (number of nucleons)

The mass of a nucleon can be found using the atomic mass of the element and the number of nucleons in the nucleus. The atomic mass of oxygen is 15.999 amu, and the number of nucleons in 16O is 8. Therefore, the mass of a nucleon is:

mass of nucleon = 15.999 amu / 2 = 7.9995 amu

The mass of the 16O nucleus can be calculated using the number of nucleons in the nucleus:

mass of nucleus = 16 x 7.9995 amu = 129.968 amu

The mass of the 16O nucleus is 129.968 amu.

The number of nucleons in the 16O nucleus is 8, so the binding energy of the 16O nucleus can be calculated as:

binding energy = mass of nucleus - (mass of nucleon) x (number of nucleons)

binding energy = 129.968 amu - (7.9995 amu) x 8

binding energy = 129.968 amu - 6.7096 amu

binding energy = 123.259 amu

Therefore, the binding energy of the 16O nucleus is 123.259 amu.

The binding energy per nucleon (B.E. / N) of the 16O nucleus can be calculated as:

B.E. / N = binding energy / number of nucleons

B.E. / N = 123.259 amu / 8

B.E. / N = 15.713375 amu

Therefore, the binding energy per nucleon of the 16O nucleus is 15.713375 amu.  

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Answer:

Thanos went *snap*

Explanation:

Answer:

100 foot

Explanation:

Using the formula for calculating range to calculate the speed first as shown;

U is the speed

theta is the observe angle

g is the acceleration due to gravity.

200 = U²sin 2(45)/9.8

Usin90 = 200 * 9.8

U² = 1960

U = √1960

U = 44.27 m/s

Get the required altitude

Altitude H = u²/2g

H = 44.27²/2(9.8)

H = 1,959.8329/19.6

H = 99.99 feet

Hence the altitude of the rocket to the nearest foot is 100 foot

The most extreme sum of weight that can hang from the conclusion of the pole is 8.66 N.

The most extreme sum of weight that can hang from the conclusion of the bar is calculated as follows.

Apply the equation for pressure utilizing Newton's moment law of movement.

Newton's moment law of movement states that the constrain experienced by a question is specifically relative to the item of the mass and speeding up of the question.

T sinθ = W

Where T is maximum tension in cable

θ is angle of inclination of cable

W is weight of cable

10 sin (60) = W

8.66 N = W

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