An atom with 4 protons and 3 electrons has what overall charge?
a. +7
b. 0
c. -1
d. +1
GIVING BRAINLIEST- PLS HELP I ONLY HAVE A FEW MINUTES

Answer:

Speed of wave = 2.5 m/s

Explanation:

Given:

Time taken by wave = 6 second

Height (Distance) of wave = 15 meter

Find:

Speed of wave

Computation:

⇒ Speed = Distance / Time taken

⇒ Speed of wave = Height (Distance) of wave / Time taken by wave

⇒ Speed of wave = 15 / 6

Speed of wave = 2.5 m/s

Answer:

The star's luminosity rises above its previous level. Because it is so cool, the surface will be red, and it will be much farther away from the center than it was during the earlier stages of star evolution. Despite its lower surface temperature, the red giant has a large surface area, which makes it very luminous.

Answer:

3 seconds

Explanation:

Applying,

Applying,

v = u±gt................ Equation 1

Where v = final velocity, u = initial velocity, t = time, g = acceleration due to gravity.

From the question,

Given: v = 0 m/s ( at the maximum height), u = 30 m/s

Constant: g = -10 m/s

Substitute these values into equation 1

0 = 30-10t

10t = 30

t = 30/10

t = 3 seconds

Explanation:

u=60

t=90s

a=

v=0

v=u+at

0=60+90a

90a=-60

a=-3/2

Answer:

0.25m/s

Explanation:

m1v1 =m2 v2. law of conservation the of momentum. since they smash together to form a big drop M2 =2m1

m1*0.50m/s=2m1*v2

V2= m1*0.50m/s÷2m1

V2= 0.25m/s

Answer:

fiber

Explanation:

An electric motor draws an rms current of 1.41 a when operating at an rms voltage of 132 v. the motor has a resistance of 17.4 ω and zero capacitor reactance

To find the motor's inductive reactance,

1. Calculate the apparent power (S) using the formula: S = V rms * I rms, where V rms is the RMS voltage, and I rms is the RMS current.

2. Calculate the true power (P) using the formula: P = V rms * I rms * cosθ, where cosθ is the power factor. In this case, since there is no capacitive reactance, cosθ = R/Z, where R is the resistance and Z is the impedance.

3. Calculate the impedance (Z) using the formula: Z = R / cosθ.

4. Calculate the inductive reactance (XL) using the formula: XL = √(Z^2 - R^2).

Let's apply these steps to the given values:

1. S = Vrms * Irms = 132V * 1.41A = 186.12 VA

2. To find P, we first need to find cosθ. Since there is no capacitive reactance, cosθ = R/Z. We don't know Z yet, so we'll move to step 3.

3. Calculate the impedance (Z) using the formula: Z = √(S^2 / (Vrms^2 * Irms^2)) = √(186.12^2 / (132^2 * 1.41^2)) = 22.068 Ω

4. Now, we can find the inductive reactance (XL) using the formula: XL = √(Z^2 - R^2) = √(22.068^2 - 17.4^2) = √(487.3936) ≈ 22.08 Ω

So, the motor's inductive reactance is approximately 22.08 Ω.

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We converted the 15 minutes to an equivalent fraction of an hour: 0.25 hour. Now we solve for x: x = 75 km/h

To arrive in time for the interview, the least speed needed for the rest of the trip is 75 km/h.

The total distance to be covered is 303 km.

Let x be the speed required for the rest of the trip.

We can use the formula:

Time taken = Distance/Speed

On the first part of the trip, you traveled 100 km at 100 km/h.

So the time taken for the first part of the trip is:

Time taken for first part = 100/100

= 1 hour

Now, the remaining distance is (303 - 100 - 40) km

= 163 km

The time taken to travel this distance at x km/h is given by:

Time taken for the rest of the trip = 163/x

If you add the time taken on the first part of the trip, it should equal 3 hours and 15 minutes.

So we can write:

1 hour + 40/45 hour + 163/x hour

= 3.25 hours

We converted the 15 minutes to an equivalent fraction of an hour: 0.25 hour. Now we solve for x: x = 75 km/h.

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A 150-lb man carries a 25-lb can of paint up a helical staircase that encircles a silo with radius 30 ft. If the silo is 120 ft high and the man makes exactly three complete revolutions, the work done by the man against gravity in climbing to the top is 48,832 ft-lb.

The work done by a person in lifting an object against gravity is given by the formula W = F × d where W is the work done, F is the force applied, and d is the distance moved in the direction of the force. Since the man is moving up the helical staircase, the distance moved by him is equal to the height of the silo, which is 120 ft. The force applied by the man is equal to the weight of the man and the can of paint. This is given by F = 150 + 25 = 175 lb. The man makes exactly three complete revolutions, which means that the vertical distance covered by him is three times the height of the silo. This is equal to 3 × 120 ft = 360 ft. However, the vertical component of this distance is equal to the height of the silo, which is 120 ft. This means that the man moves horizontally by a distance of 360 − 120 = 240 ft. This distance is covered by the man in moving around the silo. The circumference of the silo is given by 2πr, where r is the radius of the silo. Therefore, the circumference of the silo is given by 2π × 30 ft = 60π ft. The man makes three complete revolutions, which means that he moves a horizontal distance of 3 × 60π ft = 180π ft. Therefore, the total distance moved by the man is given by d = √(120² + 180π²) ft ≈ 372.77 ft. Now, substituting the values of F and d in the formula for work, we getW = F × d= 175 lb × 372.77 ft= 65,216.75 ft-lbHowever, the man is carrying the can of paint in one hand. This means that he is doing work against gravity not only for himself but also for the can of paint. Therefore, the work done against gravity by the man for himself is 65,216.75 ft-lb, and the work done against gravity for the can of paint isW = 25 lb × 120 ft= 3,000 ft-lbTherefore, the total work done against gravity is given by 65,216.75 ft-lb + 3,000 ft-lb = 68,216.75 ft-lb ≈ 48,832 ft-lb.

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Answer:

True

Explanation:

Given data

*The ball is thrown straight upwards at a speed is u = 20 m/s

*The value of the acceleration due to gravity is g = 9.8 m/s^2

*The value of the final velocity of the ball at maximum height is v = 0 m/s

The formula for the time taken by the ball to lose its speed is given by the equation of motion as

Substitute the known values in the above expression as

The current in a 12V circuit if the resistance is 20ohms is 0.6A.

Current (I) is the amount of electric charge flowing in each unit of time. It is measured in amperes (A).

The current passing through a circuit can be calculated using the following formula:

I = V/R

Where;

According to this question, a 12V circuit has a resistance is 20 ohms. The current is calculated thus;

I = 12V ÷ 20ohms = 0.6A.

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Answer:

i) Power = Force * Velocity = 1100 * 15 = 16500 W = 16.5 kW(ii)  Find the value of k first: F = 400 + k(15^2)                                              k = 28/9    F = 400 +(28/9)(30^2) = 320

Explanation:

Answer:

Look below.

Explanation:

If additives are having negative effects on health and the environment, it would be wise to not use detergents containing these additives. These additives could threaten living things such as humans and animals.

There is concern that extra additives in detergents can have negative health and environmental impacts, then it would be very unwise to use detergents containing these additives

It can be defined as the origination of the contaminant substance that poisonous or harmful to our natural environment.

There are several types of pollution that exist in our nature depending on the state and composition of the contaminant, for example, water pollution can exist due to the eutrophication process.

It would be quite unwise to use surfactants that include these additional ingredients since there is fear that they might have a harmful influence on your well-being and the environment.

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Answer:

50 grams is 0.05 kilograms.

Explanation:

1,000 grams equals 1 kilograms. Divide 1,000 by 50 and you will get 0.05.

Answer:

Its true

Explanation:

i don't know what to put

The block drops 1 meter before momentarily coming to rest, and the angular frequency of its vibrations is approximately 12.68 rad/s.

(a) To determine how far the block drops before momentarily coming to rest, we can use the principle of conservation of mechanical energy. At the highest point, the block has only potential energy, and at the lowest point, it has only kinetic energy. Therefore, the potential energy at the highest point is equal to the kinetic energy at the lowest point.

At the highest point:

Potential Energy (PE) = mgh

At the lowest point:

Kinetic Energy (KE) = (1/2)mv²

Since the block momentarily comes to rest, the velocity (v) at the lowest point is zero. Equating the potential and kinetic energies, we have:

mgh = (1/2)mv²

Simplifying, we find:

gh = (1/2)v²

To find the distance dropped (h), we can use the equation for gravitational potential energy:

PE = mgh

Solving for h, we get:

h = PE / (mg)

Now we can substitute the given values:

mass (m) = 0.579 kg

acceleration due to gravity (g) = 9.8 m/s²

Using these values, we can calculate h.

h = PE / (mg)

h = (mgh) / (mg)

h = gh / g

h = 1h / 1

h = 1

Therefore, the block drops 1 meter before momentarily coming to rest.

(b) The angular frequency (ω) of the block's vibrations can be calculated using the formula:

ω = √(k / m)

where:

k = spring constant

m = mass of the block

Substituting the given values:

k = 93.0 N/m

m = 0.579 kg

ω = √(93.0 / 0.579)

ω = √160.827

ω ≈ 12.68 rad/s

Therefore, the angular frequency of the block's vibrations is approximately 12.68 rad/s.

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Answer:

Air moves from the areas of higher temperature to areas of lower temperature.

Explanation:

this is because hotter temperatures seek out colder temps.

hope this helped!

When a teacher opens a window on a cold day. the room starts to feel cooler because air moves from the areas of higher temperature to areas of lower temperature.

The transfer of heat between two bodies by currents of moving gas or fluid is known as convective heat transfer. In free convection, air or water rises and is replaced by a cooler parcel of air or water as it moves away from the hot body.

As air moves from the areas of higher temperature to areas of lower temperature, when the teacher opens a window on a cold day, the air in the room moves out side and cold air takes the position inside the room. So, it feels cooler then.

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A potential difference applied across a circuit drives an electric current, which is the flow of charged particles. In a conductor, such as a metal wire, the charged particles that carry the current are electrons.                                              

Protons are positively charged particles, but they are much larger and less mobile than electrons in a conductor. Therefore, they do not contribute significantly to the current flow. In fact, the protons in a conductor are generally held in place by the atomic nuclei, so they cannot move through the material. Thus, there is no proton current in a conductor with a potential difference applied across the circuit.
Protons, being part of the atomic nucleus, are held firmly within the atoms of the conductor and cannot move as freely as electrons. This difference in mobility leads to the absence of proton current in a typical conductor when a potential difference is applied across the circuit.

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Its average luminance is around 100 times that of the sun.

As Henrietta Swan Levitt discovered, a Cepheid's variability period relates directly to its luminosity. The longer the variability period, the more luminous the Cepheid.

A star that is inherently variable and has a long period would have somewhat regular brightness changes that take months or years to complete one cycle. Without exception, they are all red giant and supergiant stars.

Luminous intensity is the quantity of visible light emitted per solid angle in a unit of time. Lumens are a unit of measurement for the quantity of light emitted by a source in a specific time interval (also known as luminous power or luminous flux). In connection to visual perception, the luminance is evaluated.

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Answer:

The solution is unsaturated.

Explanation:

Saturated solutions are those solutions with the maximum amount of solute completely dissolved by the solvent. This indicates that although more solute is added, it does not dissolve. In this case the amount of solute is equal to the solubility coefficient.

The supersaturated solution  is one in which the amount of solute exceeds the solubility of the solvent, that is, it has a greater amount of dissolved solute than that which it admits at that temperature. In this case a solution contains solute above the solubility coefficient.

A solution is considered to be unsaturated if the mass of dissolved solute is less than that corresponding to that of saturation. This indicates that it is possible to add more solute and that it dissolves. In this case the solution contains solute below the solubility coefficient.

The solubility of barium nitrate is 9.02 g/100 g H₂O at 20°C.

A 15.2 g sample of barium nitrate is added to 200.0 g of water at 20°C. This is: 15.2 g /200 g H₂O.  Dividing by two you get: 7.6 g /100 g H₂O

Comparing with the solubility of barium nitrate, you can see that the mass of dissolved solute is less than the corresponding one. This indicates that the solution is unsaturated.

Answer:

The flat Earth model is an archaic conception of Earth's shape as a plane or disk. Many ancient cultures subscribed to a flat Earth and due to this people still belive earth is flat but scientist proven earth is round .

Explanation:

According to Kepler's first law, the orbit is circular with the star at the center of the circle.

A planet is a celestial frame that (a) is in orbit across the sun, (b) has sufficient mass for its self-gravity to triumph over inflexible body forces so that it assumes a hydrostatic equilibrium (almost spherical) shape, and (c) has cleared the community around its orbit.

Neptune is an exquisite 3 billion miles far from the solar. but, the coldest planet isn't always Neptune, but Uranus – despite the fact that Uranus is a billion miles closer to the sun than Neptune. Uranus holds the file for the coldest temperature ever measured inside the solar device: a completely chilly -224℃.

The order of the planets within the solar system, starting nearest the solar and working outward is the following: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and then the viable Planet 9.

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According to Kepler's first law the orbit of the planet around the star is elliptical, with the star at one focus of the ellipse.

According to Kepler's first law, the orbit of the planet around the star is elliptical, with the star at one focus of the ellipse. This means that the planet's distance from the star varies over the course of its orbit, with the point at which it is closest to the star called the "perihelion" and the point at which it is farthest from the star called the "aphelion." The shape of the orbit is determined by the mass of the star and the planet, as well as the distance between them and the velocity of the planet as it orbits. The other answer choices are not correct.

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Considering the definition of speed and velocity, the difference is that speed has no direction while velocity does take direction into account.

Speed ​​is a quantity that expresses the relationship between the space traveled by an object.

In other words, speed can be defined as the amount of space traveled per unit of time with which a body moves .

Velocity is a physical magnitude that relates the displacement of an object, the time it takes to make this change in position and direction.

Because the speed also considers the direction in which the displacement of an object occurs, it is considered a vector magnitude.

The difference between speed and velocity is that speed has no direction, that is, speed is a scalar, while velocity does take direction into account, being a vectorial magnitude.

In, summary, the difference is that speed has no direction while velocity does take direction into account.

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To calculate the amount of heat transferred into the 10-kg piece of aluminum, we can use the formula:

Q = mcΔT

where Q is the amount of heat transferred, m is the mass of the aluminum (10 kg), c is the specific heat of aluminum (900 J/kg×°C), and ΔT is the change in temperature (5.0°C).

Substituting these values into the formula, we get:

Q = (10 kg) x (900 J/kg×°C) x (5.0°C)

Q = 45,000 J

Therefore, the amount of heat transferred into the 10-kg piece of aluminum is 45,000 J.

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Answer:

hey

Explanation:

hey

Answer:

Unlike hard disks, which use magnetic charges to represent 1s and 0s, Compact Disks, DVD's or Blue Rays use reflected light.

Explanation:

The way CD's work is that they are hit by a laser beam which is reflected on the surface of the disc. These disks have some valleys and mountains that reflect light differently so the CD player will interpret these differences in reflection as data which will then be turned into music, videos or computer files.