Which term describes the rate at which charge passes a point in a circuit?
O A. Voltage
O B. Power
O C. Resistance
O D. Current

Answer:

the answer is C ----- it is the rate of change of velocity per unit time

Explanation:

acceleration

\( = \frac{velocity(v)}{time(t)} \)

Given data

*The given resistor is R = 12 ohms

*The given voltage is V = 120 V

The formula for the current flows in the circuit is given as

Substitute the values in the above expression as

Thus, the amount of current flows in the circuit is I = 10 A

Answer:

B

Explanation:

direction is literally the only difference between speed and velocity

Taking into account the definition of speed and velocity, the correct answer is option b. Unlike acceleration and velocity, speed is NOT a quantity that accounts for direction.

Speed ​​refers to the distance an object travels in a given time and is a scalar quantity.

On the other hand, velocity is a magnitude that expresses the relationship between the space traveled by an object, the time used for it and its direction. In other words, velocity refers to the interval of time it takes for an object to move towards a certain direction. Since velocity considers the direction in which an object moves, it is considered a vector character magnitude.

In summary, speed does not take into account the direction of movement, while speed implies the change of position of an object in space within a certain amount of time, that is, speed plus the direction in which said movement is produced.

Finally, the correct answer is option b. Unlike acceleration and velocity, speed is NOT a quantity that accounts for direction.

Learn more:

the average velocity is given by the change in displacement divided by the change in time: average velocity = (change in displacement) / (change in time) = 8 ft / 1 sec = 8 ft/sec.

To determine the average velocity of the particle over the time interval [1, 2], we need to find the change in displacement and divide it by the change in time.

Given that the displacement function is s(t) = 5t^2 - 7t + 2, we can find the displacement at the endpoints of the interval:

s(1) = 5(1)^2 - 7(1) + 2 = 5 - 7 + 2 = 0

s(2) = 5(2)^2 - 7(2) + 2 = 20 - 14 + 2 = 8

The change in displacement is s(2) - s(1) = 8 - 0 = 8 feet.

The change in time is 2 - 1 = 1 second.

Therefore, the average velocity is given by the change in displacement divided by the change in time:

average velocity = (change in displacement) / (change in time) = 8 ft / 1 sec = 8 ft/sec.

Therefore, the correct answer is 3. average vel. = 8 ft/sec.

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When a fan is switched on, it achieves an angular acceleration of 250 rad/s2. after 1.2 s, the angular velocity in revolutions per minute would be 1989 rev/minute.

The total displacement covered by any object per unit of time is known as velocity. The velocity of an object depends on the magnitude as well as the direction of the object.

velocity = total displacement /time

As given in the problem When a fan is switched on, it achieves an angular acceleration of 250 rad/s2. after 1.2 s,

By using the equation of motion for the rotational motion,

α = ω₀ + ωt

250 = 1.2 ω

ω = 250/1.2

   = 208.33 rad/s

2π radian = 1 revolution

1 radian = 1/2π revolution

208.33 rad = 208.33 /2π revolution

                   =33.15 revolution

The number of revolutions in one minute = 33.15 ×60

                                                                =1989

Thus, the angular velocity comes out to be 1989 rev/minute.

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Answer:

Mirror angle:

0°

25°

50°

Angle of incidence (θi):

0°

25°

50°

Angle of reflection (θr)

0°

25°

50°

Explanation:

The mirror angle is the same as the angles of incidence and reflection.

Brainlist Pls!

The moment of inertia of this combination about an axis perpendicular to the bar and through one of the balls is 5.71 kgm².

The moment of inertia is a measure of how resistant an object is to changes in its rotational motion.

The moment of inertia of any object is obtained from the product of mass and square of radius of the object.

Mathematically, the moment of inertia of the rod and the points masses is calculated by apply the following equation.

I = ¹/₁₂ML²  +  2m(L/₂)²

where;

The moment of inertia of this combination about an axis perpendicular to the bar and through one of the balls is calculated as follows;

I = ¹/₁₂(2.6)(3.5)²  +  2(0.5)(3.5/₂)²

I = 2.65 + 3.0625

I = 5.71 kgm²

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Sally drove from New York to Washington and back again. The distance between New York and Washington is 490.91 miles.

The average speed is = Distance/time,

x/50 + x/60 = 18

6x/300 + 5x/300 = 18

11x / 300 = 18

11x = 18 × 300

11x = 5400

x = 5400 / 11

x = 490.91 Miles.

Hence, the distance between New York and Washington is 490.91 miles.

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The wavelength of light emitted from the tube  is 103,122,658 nm.

To determine the wavelengths of light emitted as the hydrogen atoms return to the ground state, we need to use the Balmer series formula:

1/λ = R(1/2² - 1/n²)

where λ is the wavelength of the emitted light, R is the Rydberg constant (1.097 x 10^7 m⁻¹), and n is an integer representing the energy level of the excited hydrogen atom.

The maximum excitation energy gained by an atom is 12.5 eV. We can use this energy to find the value of n for the highest energy level:

12.5 eV = 1/2 mv² = -13.6 eV (1/2² - 1/n²)

1/n² = 1/2² + (12.5 eV + 13.6 eV)/(-13.6 eV)

n = 4

So the highest energy level of the excited hydrogen atom is n = 4. As the atom returns to the ground state (n = 1), it will emit photons with wavelengths given by the Balmer series formula:

1/λ = R(1/2² - 1/n²)

1/λ = (1.097 x 10⁷ m⁻¹)(1/4 - 1/1)

λ = 103,122,658 nm

Therefore, the only wavelength of light emitted from the tube as the hydrogen atoms return to the ground state is 103,122,658 nm.

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2800 m

Given

time = 80 s

average velocity = 35 m/s

Required

total distance before it broke down

Solution

Average velocity : total displacement : total time

Can be formulated

avg velocity = Δx : Δt

Input the value :

Δx=avg velocity x Δt

Δx = 35 m/s x 80 s

Δx = 2800 m

In addition, if we are asking for velocity, we must know the starting and ending points (displacement)

But if we calculate the total distance, what is written is the average speed

avg speed = total distance : total time

Answer: Velocity = v = 35 m/s

Explanation:

Kinetic energy of an object is defined as the energy possess by an object due to its motion. Kinetic energy K.E of an object is equal to the half of the mass of that object multiplied by square of the object's velocity.

Mathematically,

v = 35 m/s

An incline plane makes loading a piano into a truck easier by reducing the amount of force required.

When loading a piano onto a truck, an inclined plane, such as a ramp, can significantly ease the process. The incline plane reduces the effort needed to lift the piano vertically by allowing it to be moved up gradually along the ramp. This transformation of the lifting task into a more manageable horizontal pushing or pulling task reduces the force required. As the piano sits on the ground, it possesses gravitational potential energy due to its height above the ground. However, as it is moved up the incline, some of the potential energy is converted into kinetic energy, specifically the energy of motion. Once the piano is fully loaded into the truck, it will remain there with the potential energy unchanged, but with a lower kinetic energy, as it comes to a stop.

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The radioactivity of the element after 5 minutes is 75 Bq.

Radioactivity is a phenomenon exhibited by radioactive elements or isotopes by emitting energy and subatomic particles spontaneously.

The radioactivity of a radioactive element or isotope in  becquerels is denoted by decay per second.

The radioactivity of the isotope in  becquerels is calculated as follows;

Bq = decay / time

Half life = 10 min

This implies that after 10 minutes, the activity of the element will be;         ¹/₂(100 Bq) = 50 Bq

The given time, 5 minutes is not up to 10 minutes, so the element will not be reduced to 50 Bq.

5 minutes = half of 10 minutes

half of 50 Bq = 25 Bq

So after 5 minutes, the element will decay 25 Bq, and the activity will be 75 Bq.

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The energy of a photon of amber light with a wavelength of 584 nm is  approximately 3.39979726 ×\(10^-^1^9\)Joules.

When developing photochemical film in a darkroom, it was common practice to use amber light to prevent damage to the film. Amber light is characterized by a specific wavelength, which in this case is 584 nm. To determine the energy of a photon of amber light, we can employ the equation E = hc/λ, where E represents the energy, h is Planck's constant (6.62607015 ×\(10^-^3^4\) J·s), c denotes the speed of light (2.998 ×\(10^8\)m/s), and λ represents the wavelength.

Plugging in the given values, we have:

E = (6.62607015 ×\(10^-^3^4\)J·s × 2.998 ×\(10^8\) m/s) / (584 nm × \(10^-^9\) m/nm)

Simplifying the equation:

E = (1.98644582 ×\(10^-^2^5\) J·m) / (5.84 × \(10^-^7\) m)

E = 3.39979726 ×\(10^-^1^9\) J

Therefore, the energy of a single photon of amber light with a wavelength of 584 nm is approximately 3.39979726 × \(10^-^1^9\) Joules.

It is worth noting that photons are discrete packets of energy associated with electromagnetic radiation. The energy of each photon is directly proportional to the frequency (or inversely proportional to the wavelength) of the light. In the case of amber light, which has a longer wavelength, the energy of the photons is relatively low compared to shorter wavelength light such as blue or ultraviolet light. This property makes amber light suitable for use in a darkroom, as it minimizes the risk of damaging photosensitive materials.

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The use of a hose stream in firefighting can protect firefighters and property from heat caused by the fire by providing a cooling effect and reducing the temperature of the surrounding area.

When firefighters use a hose stream, the water from the hose absorbs the heat from the fire and evaporates, which helps to cool down the immediate environment. This reduces the radiant heat that can cause burns and helps protect firefighters as they approach the fire.

Additionally, the water from the hose can also suppress the fire, preventing it from spreading and causing further damage to the property. Overall, the use of a hose stream is an effective method for protecting both firefighters and property from the heat of a fire.

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The question asks about the advantage of a metal film resistor over a carbon resistor.

Metal film resistors offer several advantages over carbon resistors.

One major advantage is their higher precision and stability. Metal film resistors are manufactured using a thin layer of metal alloy, typically nickel-chromium or tin-oxide, deposited onto a ceramic substrate. This deposition process allows for precise control of the resistance value and ensures more accurate resistance tolerances compared to carbon resistors. Metal film resistors also exhibit better long-term stability, meaning their resistance value remains relatively constant over time and under varying temperature conditions. This stability is important in applications where precise and consistent resistance values are required.

Another advantage of metal film resistors is their lower noise level. Noise in resistors refers to the random variations in resistance value that can introduce unwanted signal distortions in sensitive circuits. Metal film resistors have inherently lower noise levels compared to carbon resistors due to their uniform and tightly controlled resistive film. This makes metal film resistors particularly suitable for applications where low noise is critical, such as in audio circuits or high-gain amplifiers.

In summary, metal film resistors offer advantages over carbon resistors in terms of precision, stability, and lower noise levels. These characteristics make them more suitable for applications that require accurate resistance values, long-term stability, and minimal signal distortion.

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Answer:

One-dimensional

Explanation:

Answer:

Final velocity = 19 m/s

Explanation:

Initial velocity (u) = 4 m/s

Acceleration (a) = 0.5 m/s²

Time (t) = 30 s

Final velocity (v) = ?

In this question, you must use the formula:

v = u + at

Substitute the values into the formula.

v = 4 + (0.5 × 30)

v = 4 + 15

v = 19 m/s

Answer: please find the attached file for the solution.

Explanation:

In a velocity time graph for the motion of the body, the total distance covered by the body is area under the graph.

Please find the attached file for the solution.

How fast sound travels through water at sea level and how deep the ocean is  1.432 x 10³m.

Given

Bulk modulus ( B ) = 0.21 x 10¹⁰ N/ m²

density of sea le ) = 1024 kg / m³

Speed of sound In sea water ( v ) = √B/е

V =√0. 21 x 10¹⁰/1024

V = 1-.432 x 10³ m/s

The Speed of sound has to travel at the bottom of sea and get reflected back to ship itself the distance travel by Sound is 2x

So

(t = 2 see )

2x = vt

2x = 1 . 432 x 10³ x 2

x = 1.432 x 10³m

By observing the velocity of this compressed area as it passes through the medium, we can determine the speed of sound. The sound wave travels at a speed of approximately 343 meters per second, or 767 miles per hour, in dry air at 20 degrees Celsius.

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Answer:

36 J

Explanation:

Let's start off with the Kinetic Energy formula: 1/2m\(v^{2}\)

So to find the change in Kinetic Energy, you would first have to find the Kinetic Energy in the beginning and in the end.

*Note: Mass: you incorrectly wrote weight = 6 kg- because weight is a force you have to write 6 Newtons. If you are talking about the mass, you would write 6 kg. If you are talking about weight, you would write 6 Newtons. The difference will make significant changes to the answer, so I will give you the answer for both.

If 6 kg is the MASS:

Beginning: find the kinetic energy.

Plug in all parts of the formula: 1/2mv^2 = \(\frac{1}{2}\)(6)(2 squared)= \(\frac{1}{2}\)(6)(4)= 12 J

End: find the kinetic energy.

Plug in all parts of the formula: 1/2mv^2=\(\frac{1}{2}\)(6)(4 squared)=\(\frac{1}{2}\)(6)(16)= 48 J

Answer:

36 J

If 6 kg is the WEIGHT:

We know that the weight formula is mg, or mass times acceleration due to gravity (which is always 9.8 m/s^2). Plug in the numbers:

Weight = mass x acceleration due to gravity

6 = mass x 9.8

6 = 9.8m

*Divide both sides*

mass = 0.6 kg

Now, we can use the mass to find the kinetic energy.

Beginning: find the Kinetic Energy

Plug in all parts of the formula: 1/2mv^2 = \(\frac{1}{2}\)(0.6)(2 squared)= \(\frac{1}{2}\)(0.6)(4)= 1.2 J

End: find the Kinetic Energy

Plug in all parts of the formula: 1/2mv^2=\(\frac{1}{2}\)(0.6)(4 squared)=\(\frac{1}{2}\)(0.6)(16)= 4.8 J

Answer:

3.6 J

(this answer is not very feasible, so 36 J is the way to go. But just remember, don't mix up weight and mass again- as you can see, they lead to different answers!)

i. The gravitational force between the earth and sun can be obtained as follow:

F = GM₁M₂ / r²

F = (6.67×10¯¹¹ × 5.987×10²⁴ × 1.989×10³⁰) / (1.5×10¹¹)²

F = 3.53×10²² N

Thus, the gravitational force between the earth and sun is 3.53×10²² N

ii. The gravitational force between the earth and moon can be obtained as follow:

F = GM₁M₂ / r²

F = (6.67×10¯¹¹ × 5.987×10²⁴ × 7.347×10²²) / (3.844×10⁸)²

F = 1.99×10²⁰ N

Thus, the gravitational force between the earth and moon is 1.99×10²⁰ N

Comparison = G₁ / G₂

G₁ / G₂ = 3.53×10²² / 1.99×10²⁰

G₁ / G₂ = 177

Cross multiply

G₁ = G₂ × 177

Thus, we can say that the gravitational force between the earth and sun is 177 times bigger than the gravitational force between the earth and moon

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After traveling 200 m, the tire's rotation has increased to 6.9 revs , 0.76rad/s was the tire's angular acceleration

What is the definition of angular acceleration?

A spinning object's change in angular velocity per unit of time is expressed quantitatively as angular acceleration, also known as rotational acceleration. It is a vector quantity with either one of two predetermined directions or senses and a magnitude component. Spin angular velocity and orbital angular velocity are the two different types of angular velocity.

v o =3.3 rev s * 2 pi rad 1rev = 20.73 rad / s

v f =6.4 rev s * 2 pi rad 1rev = 40.21 rad / s

D= x*r

x = D/r i.e. 250/0.64 = 781.25rads

w3 - w² = 2a *x

α= w3-w2 /2x  = (40.21)2-(20.73)2 /2*781.25

 =  0.76rad/s

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The concentration of salt in water affects the specific heat capacity by changing the thermal properties of the solution, causing it to require less heat to be raised in temperature.

The specific heat capacity of water is the amount of heat required to raise the temperature of a certain mass of water by 1 degree Celsius. The concentration of salt in water affects its specific heat capacity because the presence of ions in the solution changes the thermal properties of the water.

As the concentration of salt in water increases, the specific heat capacity of the solution decreases. This is because the ions in the salt solution require less heat to be raised in temperature than pure water molecules. Additionally, the ions in the salt solution also increase the mobility of water molecules, causing them to transfer heat more efficiently and therefore, the heat energy required to raise the temperature of the solution is reduced.

It should be noted that the effect of salt concentration on specific heat capacity is small, and significant changes in specific heat capacity usually require very high salt concentrations. Nevertheless, the change in specific heat capacity can have a significant impact on the thermal dynamics of systems such as oceans, which contain high salt concentrations.

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B. Ice-skating - Ice-skating can be explained with the help of conservation of angular momentum. When an ice skater pulls their arms inwards, their angular momentum decreases and their rotational velocity increases.

Momentum is a physical concept that describes the tendency of a body in motion to stay in motion, or an object at rest to stay at rest, unless it is acted upon by an external force. It is a measure of an object's mass multiplied by its velocity, and is typically represented by the letter "p". Momentum is a conserved quantity, meaning that the total momentum of a system remains constant, no matter how the system is altered. This property makes momentum an important factor in many physical processes, including collisions, explosions, and the motion of fluids. Momentum also plays a role in the motion of celestial bodies, such as planets, stars, and galaxies.

This is because when the skater reduces their moment of inertia by bringing their arms in, the angular momentum must decrease to conserve angular momentum.

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Explanation:

CON EL TEOREMA DE PITÁGORAS

v = \(\sqrt{(12 km/h)^{2} + (25 km/h)^{2}}\) = 27.7 km/h