if a typical family of four uses electric energy at an average rate of 700 w , how many kwh would their electric bill show for one month (30 days)?

Answer:

I = 50 A

Explanation:

The magnetic field created by a wire with a current can be calculated as:

Where μ is a constant equal to 4π x 10^(-7) T m/A, I is current, and r is the distance from the wire. So, replacing the values, we get:

Then, solving for I, we get:

Therefore, the current that is traveling through the wire is 50 A.

On the other hand, if the current is moving upward, the direction of the magnetic field can be found by the rule of the right hand, so the magnetic field will have the following direction:

Your question doesn't look right, so lemme assume you meant this.

A heater marked 60w evaporate 6x 10^-³kg of boiling water in 60 seconds. What is the specific latent heat of vaporization of water in jkg?

so you can understand it better..

Latent heat of evaporation is the heat required required to change water to vapor at the same temperature.(100°C)

eg. water boils at 100°C and in presence of more heat it turns to vapor at that Same temperature.

This heat is know as latent heat of Vaporization.

it's give by H=mL

where L is the specific latent heat of vaporization.

The  specific latent heat of vaporization of water  is 6×10⁵ Joule/kg.

The heat or energy that is absorbed or released during a substance's phase change is known as latent heat. It might go from a solid to a liquid or from a liquid to a gas, or vice versa. Enthalpy, a characteristic of heat, is connected to latent heat.

Given parameters:

Mass of the water = 6 × 10⁻³ kg.

Power of the heater = 60 watts.

Time taken = 60 second.

Hence, total heat absorbed by the water = 60×60 joule = 3600 joule.

Hence, specific latent heat of vaporization of water =

total heat absorbed /mass of the water

= 3600/6 × 10⁻³ J/kg

= 6×10⁵ Joule/kg.

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Suppose a large gasoline tank has the shape of a halfcylinder 8 feet in diameter and 10 feet long (Figure 6.45). If the tank is full, the work W necessary to pump all the gasoline to the top of the tank is 10,598.4π ft-lb.

Given that a large gasoline tank has the shape of a half-cylinder 8 feet in diameter and 10 feet long. And the tank is full, so we need to find the work W necessary to pump all the gasoline to the top of the tank. Let us begin the solution; The formula for the volume of a cylinder is given as, V = πr²h

For a half-cylinder, the volume is halved, so the formula becomes, V = 1/2 πr²hHere, r = 4ft, h = 10ft

Therefore, V = 1/2 * π * (4ft)² * 10ftV = 80π cubic feet

Given, gasoline weighs 42 pounds per cubic foot. Mass = Volume x Density

m = 80π * 42m = 3360π pounds

To pump all the gasoline to the top of the tank, the work done is given as, W = mgh, where m = mass of the gasoline, g = acceleration due to gravity and h = height

W = 3360π x 32 x 10W = 10,598.4π ft-lb of work

Hence, it requires about 10,598.4π ft-lb of work to pump all the gasoline to the top of the tank.

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To find the work necessary to pump all the gasoline to the top of the tank, calculate the change in volume using the equation W = PAV, where P is the pressure, A is the area of the end of the cylinder, and V is the change in volume. The volume of the tank and the volume of the gasoline can be calculated using the formulas for the volume of a cylinder. Substitute the values into the equation to find the work.

The work necessary to pump all the gasoline to the top of the tank can be calculated using the equation W = PAV, where P is the pressure, A is the area of the end of the cylinder, and V is the change in volume. The gasoline tank can be treated as a solid steel object.

To find the change in volume, we need to calculate the volume of the tank and the volume of the gasoline. The volume of the tank is given by the formula for the volume of a cylinder, V_tank = πr^2h, where r is the radius of the cylinder and h is the height. The volume of the gasoline is given by the product of the area of the end of the tank and the height, V_gasoline = Ah.

Once we have the volume of the tank and the volume of the gasoline, we can calculate the change in volume of the gasoline and of the tank. Finally, we can substitute these values into the equation W = PAV to find the work necessary to pump all the gasoline to the top of the tank.

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Answer:

48 Newtons

Explanation:

The force of friction between the sled and the snow is 48 newtons.

Given that,

Based on the above information, the calculation is as follows:

\(= 8\times 10x^{-1}N cos(53)\)

= 48 newtons

Therefore we can conclude that the force of friction between the sled and the snow is 48 newtons.

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Among the following options, Enterprise Resource Planning (ERP) is the type of ES frequently used to support operational procurement activities.

ERP or Enterprise Resource Planning is a software application that an organization uses to manage its business processes. It integrates various departments, such as finance, HR, inventory, and procurement, into a single system and streamlines communication between them. This assists firms in effectively utilizing resources and achieving their objectives.

ERP system is frequently used to support operational procurement activities because it can help in coordinating the purchasing process from start to finish. It also automates many activities such as generating purchase orders, tracking shipments, recording receipts, and paying invoices.

Thus, it can increase the efficiency and accuracy of procurement processes, reducing the need for manual intervention.

Therefore, the correct answer is A) ERP.

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Answer:

Wood is lighter than iron of the same volume because wood has a lower density. Density is a measure of mass per unit volume, and iron is denser than wood. Iron has tightly packed atoms with strong metallic bonds, while wood has a porous structure with empty spaces between its fibers and cells. These empty spaces in wood reduce its overall mass for a given volume, resulting in its lighter weight compared to iron.

Explanation:

appreciate you helping me, what shall one do if he thinks he has done a mistake and wants to reverse it? related to bul l yinging stuffs in school

Answer:

For any collision occurring in an isolated system, momentum is conserved. The total amount of momentum of the collection of objects in the system is the same before the collision as after the collision.

Explanation:

Hope this helps

Hello there!

Formula: A = F * S = mg * S

So m = A/gS

a) m = 1000 J/(9.81 N/kg * 10 m) ≈ 10.194 kg

b) m = 1250 J/(9.81 N/kg * 1 m) ≈ 127.41 kg

d) m = 1000 J/(9.81 N/kg * 10 m) ≈ 7900.1 kg

e) m = 8900 J/(9.81 N/kg * 215 m) ≈ 4.22 kg

g) m = 98 J/(9.81 N/kg * 59m) ≈ 0.17 kg

h) m = 750 J/(9.81 N/kg * 0.75 m) ≈ 101.94 kg

c) m = 1.25 kJ/(9.81 N/kg * 90 m) = 1250 J/(9.81 N/kg * 90 m) ≈ 1.42 kg

f) m = 90 J/(9.81 N/kg * 1250 m) ≈ 0.007339 kg = 7.339 g

i) m = 5 kJ/(9.81 N/kg * 980 m) = 5000 J/(9.81 N/kg * 980 m) ≈ 0.52 kg

The solution for the given capacitance is  0.5 .

If the charge is maintained constant, the capacitance will only decrease as the potential increases.The equation states that when the potential difference is smaller, capacitance is larger.

Uc = \(0.5 * C * V^2,C\) = Capacitance,V = Potential,Then\(,C1 = 2C2,V2 = 2V1\),Then \((Uc)1/(Uc)2 = (0.5 * C1 * V1^2) / (0.5 * C2 * V2^2) = 2/4 = 0.5.\)

What distinguishes capacitance from potential?

Capacitance measures the capacity to store charge, whereas electric potential assesses the capability to do work on a charge.Coulomb / Voltage (C/V), which represents the quantity of charge existing per applied voltage, is the measurement unit for capacitance.

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The speed of the melon as it flies off the performer's head is 0.3 m/s

The law of conservation of momentum states that for a system of colliding bodies, the total momentum before the collision is equal to the total momentum after the collision, provided there is no net external force acting on the bodies.

To find the speed of the melon, we use the formula from the law of conservation of momentum.

Formula:

Where:

From the question,

Given:

Substitute these values into equation 1

Hence, The speed of the melon as it flies off the performer's head is 0.3 m/s.

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The time taken by the object with the velocity of 30 m/s is 3.061 s.

What is velocity?

Velocity can be defined as the rate of change of the position of the given object with a reference and time which is a vector quantity. It can be calculated using distance and the speed of the given object.

The time taken by an object with the velocity of 30 m/s can be calculated as,

v = u + gt

where v is the final velocity, t is the time, g is the acceleration due to gravity and u is the initial velocity.

30 m/s = 0 + 9.8 x t

t = 3.061 s

Therefore, the time taken by the object with the velocity of 30 m/s is 3.061 s.

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The initial velocity of the car, given that it takes 6.0 seconds to slow down to a stop is 30 m/s

The initial velocity of the car can be obtained by doing the following:

First, we list out the given parameters from the question. This is given below:

Finally, we shall determine the initial velocity of the car as illustrated below:

s = (v + u)t / 2

90 = [(0 + u) × 6] / 2

90 = [u × 6] / 2

90 = 6u / 2

Cross multiply

6u = 90 × 2

6u = 180

Divide both sides by 6

u = 180 / 6

u = 30 m/s

From the calculations made above, we can conclude that the initial velocity of the car is 30 m/s

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The speed of the longitudinal wave is 1.584 or approximately 1.6 meters per second.

Longitudinal waves are waves in which the medium's vibration is parallel to the wave's travel direction and the medium's displacement is in the same direction as the wave's propagation.

Sound waves are one example of longitudinal waves. Waves of ultrasound P-waves from earthquakes

A longitudinal wave's key features include compression, rarefaction, wavelength, amplitude, period, and frequency.

To calculate the above answer multiply wavelength by frequency to get the speed of a wave.

That is:

2.4 x 0.66

= 1.584

Where the frequency is not given beforehand, you can divide 6 crests by 9.1 seconds to determine the frequency.

Hence, the speed of the longitudinal wave is 1.584 which is approximately 1.6.

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Answer:

Explanation:

How would this number be expressed in scientific notation? 1.898^27 kg. ...

Answer:

the gravity was pulling the cup to the front of the window even though the wind was pushing it the other way.

Explanation: the gravity must be strong

By using the Newton's first law of Motion, it can be explained why the coffee spilt all over the windshield. This is because there is gravitational force which acts upon it and it pushes the substances in the downward direction towards the Earth.

Newton's first law of Motion states that a body remains in the same state of rest or uniform motion in a straight line unless and until an external force is applied on it. This means that a body will not start moving by itself until and unless an external force acts on it.

In this case, lachance's daughter is trying to pick her coffee cup, the coffee cup at the windshield is spilt which makes it difficult for her to see. This is because, there is the gravitational force or gravity which is pulling the coffee cup to the front of the window even though the wind was pushing it in the other way.

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The time taken by the ball to reach the surface of the moon that drops from a height of 1.5 m from the moon is 1.36s.

Given that the acceleration of gravity on the surface of the moon is, \(a=g=1.62 ms^{-2}\). The distance of the ball from the surface is the height of the ball from the surface. So, \(h=d=1.5 m\).

Since the ball is dropped under gravity or free-fall motion from rest, then the initial velocity is zero (i.e.) \(v=0ms^{-1}\). Let t be the time taken by the ball to reach the surface of the moon.

By the equation of motion, the equation is given by \(h=v_{0} t+\frac{1}{2}gt^{2}\), where g is the gravity, t is the time taken by an object, h is the distance of the object, and \(v_{0}\) is the initial velocity of an object from the rest.

Substitute the values of h, g, and \(v_{0}\) in the above equation, and we get

\(1.5=(0)t+\frac{1}{2}(1.62)t^{2}\)

\(1.5=0.81t^{2}\)

\(t^{2} =\frac{1.5}{0.81}\)

\(t^2=1.852\)

\(t=\pm1.36s\)

The time taken cannot be negative.

Therefore, The time taken by the ball to reach the surface of the moon is 1.36s.

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The wavelength of the light beam having a frequency of 6 × 1017 hz is 0.05 nm.

To calculate the wavelength of a light beam, we can use the formula:

λ = c/f

Where λ is the wavelength, c is the speed of light and f is the frequency of the light.

The speed of light is approximately 3 x 10^8 m/s, we can use this value to find the wavelength.

λ = c/f

λ = (3 x 10^8 m/s) / (6 x 10^17 Hz)

λ = 0.05 nm

So the wavelength of the light beam is 0.05 nm.

It's important to mention that the wavelength is inversely proportional to the frequency, meaning if the frequency is high the wavelength is short and if the frequency is low the wavelength is long.

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Answer:

Explanation:

From the question we are told that

   The mass of the tennis ball is  \(m = 0.060 \ kg\)

    The speed is  \(u = 15 \ m/s\)

    The initial height of the ball is  \(h_o = 2.2 \ m\)

     The height considered is  \(h = 9.5 \ m\)

Generally the time taken to reach the considered height is mathematically evaluated from the equation of motion as follows

           \(h = h_o + ut - \frac{1}{2} gt^2\)

=>         \(9.5 = 2.2 + 15t - \frac{1}{2} * 9.8 t^2\)

=>         \(7.3 = 15t - 4.9t^2\)

=>          \(4.9t^2 -15t + 7.3\)

solving the above equation using quadratic formula

           \(t= 0.6070 \ s\) and  \(t_1 = 2.454 \ s\)

Generally from kinematic equation we have that

        \(v = u - gt\)

=>     \(v= 15 - 9.8 * 0.6070\)

=>      \(v= 9.0514 \ m/s\)

Note if we had used the second values of time the velocity at 9.5 \ m would have been negative which is not correct given that at maximum height velocity is zero

Answer:

Velocity vectors are always perpendicular to the circle.

Acceleration vectors point toward the center of the circle.

Velocity vectors are the same length.

Explanation:

(THESE ARE NOT MY WORDS BTW)

1) Acceleration and velocity are vectorial quantities, which means they have magnitude and direction.

2) In a circular motion velocity direction changes all the time, which means that it is accelerated.

3) In a uniform circular motiion, the velocity changes in a constant value. This is the rate of change of velocity, which is the magnitude of the acceleration, is constant (uniform).

4) The velocity is perpendicular to the path, i.e. the circle. You can see it if you think that if the object stopped changing the direction, then the object would follow a straight path (as per inertia principle). That is why this velocity is called tangential velocity (to differentiate it of the angular velocity).

This is what the option C says "Velocity vectors are always perpendicular to the circle". Then this is true.

5) The constant change of direction in a circular path, means that the object is been pushed, accelerated, toward the center of a circle. This is, all the time the object in motion tries to follow the perpendicular path but a push (a force) directed to the center of the circle changes its direction. Such force accelerates the object toward the center of the circle. So, the acceleration vectors point toward the center of the circle, which is what the option D says. So, this is also true.

6) Since the motion is uniform, the magnitude or length of the velocity vectors are always the same, are constant. So, the option E. is also true.

Acceleration vectors point in the direction of motion. Acceleration vectors point toward the center of the circle, and velocity vectors are the same length. The correct options are B, D, and E.

The item moves in a circular motion at a constant speed in uniform circular motion. Because the object's direction is continually changing, it experiences acceleration.

Because they are responsible for changing the direction of motion, the acceleration vectors always point towards the centre of the circle.

Velocity vectors reflect the magnitude and direction of an object's velocity. The velocity vectors in uniform circular motion are always tangent to the circle and perpendicular to the radius at any given location.

They have the same length because the speed is constant in uniform circular motion.

Thus, the correct options are B, D, and E.

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Your question seems incomplete, the probable complete question is:

In a uniform circular motion map, what is always true?  Check all that apply.

A.The dots are different distances apart.

B.Acceleration vectors point in the direction of motion.

C.Velocity vectors are always perpendicular to the circle.

D.Acceleration vectors point toward the center of the circle.

E.Velocity vectors are the same length.

The solar feature shaped like an arch is called prominence. A prominence is a long-lasting solar feature that is composed of plasma, which is a hot ionized gas.

It appears as a bright arch-like structure, extending outwards from the Sun's surface, as shown in the picture. Prominences are typically seen around the Sun's limb, where they can be viewed against the dark background of space. These features are also known as filaments when they appear dark against the Sun's surface or as spicules when they appear as short, small spikes on the surface. Prominences occur when plasma from the Sun's corona is trapped in the Sun's magnetic fields. The magnetic fields of the Sun, which are constantly shifting and changing, play a critical role in shaping the Sun's atmosphere and creating these structures. The temperature of prominences ranges from a few thousand to over a million degrees, and they can extend over hundreds of thousands of kilometers in space. They can last for hours or even for weeks.

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Answer:

prominence

Explanation:

The statement "a 3,000 pound car traveling at 70 mph has 15.8 million pounds of force to release in a crash." is false

The force that a car has during a crash depends on the deceleration that occurs, which is determined by factors such as the distance over which the car decelerates and the duration of the impact.

The statement given in the question is incorrect and misleading. It is important to note that a 3,000 pound car traveling at 70 mph has a high amount of kinetic energy, and crashes can have significant and dangerous consequences even without millions of pounds of force being involved.

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The induced voltage in the loop is given by the formula V = N * B * l * v, where N is the number of turns, B is the magnetic field, l is the length, and v is the velocity.

Faraday's law of electromagnetic induction states that the induced voltage in a closed loop is proportional to the rate of change of the magnetic flux through the loop. In this case, the magnetic field B is uniform between the poles and negligible elsewhere. As the rectangular loop moves with a constant velocity v to the right, the magnetic flux through the loop changes.

The rate of change of the magnetic flux is given by B * l * v. Since there are N turns in the loop, the total induced voltage becomes V = N * B * l * v. This formula helps determine the induced voltage using the given variables N, v, B, and l.

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The same number of particles of gas at a lower temperature will have a larger volume when pressure is constant each balloon contains the same number of gas molecules.

A frozen balloon contracts because the average kinetic energy of the gas molecules inside the balloon decreases as the temperature drops. As a result, the molecules move more slowly and collide with the inner wall of the balloon less frequently and weaker, causing the balloon to deflate somewhat.

As the temperature increases gas particles absorb more thermal energy. They go faster and farther. An increase in temperature, therefore, causes an increase in volume. Inside the balloon, as the temperature rises the individual gas molecules that make up the gas move very quickly although they are invisible to the open eye.

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The everyday activities that most illustrates the concept of accretion are rainbows forming in the sky after a rain shower and a dough mixer forming a “ball” from ingredients.

Accretion is the process in which something grows or increases in size by accumulation of additional layers of matter. In astronomy it is usually due to force of attraction between two particles.

Here, during a rainbow formation all seven colours in order form a circle layer by layer due to refraction of sunlight in rain water. In a dough mixer, the final ball is not formed all at once. First a small ball is initially formed and more flour gets added up to it forming the final ball.

Therefore, the everyday activities that most illustrates the concept of accretion are rainbows forming in the sky after a rain shower and a dough mixer forming a “ball” from ingredients.

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Answer:

\(R_s = 0.093 \Omega\)

Explanation:

Voltage of the car battery = 12.0 V

Voltage drop in the battery = 3.4 V

The remainder of the voltage is the starter voltage, that is:

Starter voltage = Initial battery voltage - voltage drop

Starter voltage = 12.0 - 3.4

Starter voltage, \(V_{s}\) = 8.6 V

Current drawn by starter, \(I_s\) = 93 A

According to Ohm's law: \(V_s = I_s R_s\)

Starter Resistance, \(R_s\) = \(V_s/I_s\)

\(R_s = 8.6/93\\R_s = 0.093 \Omega\)

The change in temperature of the copper block of mass 125 g is 2 °C.

a process whereby the degree of hotness of a body (or medium) changes from one value to another.

To calculate the change in temperature of the copper, we use the formula below.

Formula:

Where:

From the question,

Given:

Substitute these values into equation 1

Hence, the change in temperature of the copper block is 2 °C.

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The average speeds based on the split times from the data in the table for the world record 100 m run by Usain Bolt indicates the following values;

a. 1.744 s

b. 5.74 m/s

c. Maximum speed in the first 10 meters is about 11.47 m/s

d. Acceleration over the first 10 meters is about 6.58 m/s²

e. 12.35 m/s

Average speed is a measure of how fast the motion of an object is within a specified distance. The average speed is the ratio of the total distance to the total duration.

a. The time Usain Bolt takes to run the first 10 meters is; t = (1.89 s - 0.146s) = 1.744 s

b. The average speed = Distance/time = 10 m/1.744 s = 5.74 m/s

c. Whereby the acceleration is constant, the maximum speed will be at the first session, therefore;

v² = u² + 2·a·s

s = The distance = 10 meters

v = √(2×a×10) = 2·√(5·a)

v² = 20·a

Acceleration, a = (v - u)/t = (v/1.744)

v² = 20 × (v/1.744)

v = 20/1.744 ≈ 11.47

The maximum speed over the first 10 meters is about 11.47 m/s

d. The acceleration a = v/1.744

Therefore; a = 11.47/1.744 ≈ 6.58

The acceleration over the first 10 meters is about 6.58 m/s²

e. The fastest time for each 10 metre section is 0.81 seconds in the 60 to 70 meters section, therefore;

Therefore, we get;

Top average speed = (70 - 60)/(0.81) ≈ 12.35

The top speed is about 12.35 m/s

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