A copper cable is 1.2 km long and has a cross-sectional area of 5 mm^2. Find its resistance at 80°C if at 20°C the resistivity of copper is 0.02*10^-6ohm m and its temperature coefficient of resistance is 0.004/°C

Answer:

1. Power = 5000 Watts

2. Workdone = 11185.5 Joules

Explanation:

Given the following data;

1. Distance = 18 m

Energy = 100 KJ = 100,000 Joules

Time = 20 seconds

To find the average power of the elevator;

Power = energy/time

Power = 100000/20

Power = 5000 Watts

2. Power = 0.4 HP

Time = 15 seconds

Conversion:

1 horsepower = 745.7 Watts

0.4 horsepower = 0.4 * 745.7 = 298.28 Watts

To find the amount of work done by the electric mixer;

Work done = power * time

Workdone = 745.7 * 15

Workdone = 11185.5 Joules

Answer:

Explanation:

2^5=32-20=-12 meters per sec (going backwards).

If this is correct pls mark me. brainly to let me know, tyy C:

Answer:

101 meters

Explanation:

Distance traveled by the tourist:

d = 3.60 m/s × t

Distance traveled by the bear:

d + 39.3 m = 5.00 m/s × t

Substitute:

3.6 t + 39.3 = 5 t

39.3 = 1.4 t

t = 28.1

d = 101

Answer:

its b and a

Explanation:

Correct option is B 8 cm.

Let radius of gyration for the axis not passing through center of mass be r and that for the axis passing through the center of mass be k and the distance between the two parallel axes be a.

Parallel axes theorem gives:

Thus, option B is the correct answer.

Because the mass and displacement are already given in Kg and m, respectively, in the first part of your question, there is no need to convert them. However, in the second part of your question, you must use the given equation to calculate the spring constant.

if the table data is given in grams and  cm you have to convert it using the following conversion,

1. To convert grams to kilograms, we divide the mass values by 1000.

2. To convert centimeters to meters, we divide the displacement values by 100.

But here in the given table it's already given the mass in kg and the displacement in meters (m). so no need to convert it.

Now comes the second part of your question,

To calculate the spring constants for the given data, we can use the equation:

k = -mg/Δx

where:

k is the spring constant (in N/m),

m is the mass (in kg), and

Δx is the displacement of the spring (in m).

Let's calculate the spring constants using the provided data:

Mass (kg): 0.05  0.1  0.2  0.3  0.4  0.5  0.6

Displacement of Spring (m): 0.012  0.027  0.065  0.1  0.135  0.17  0.199

Using the equation

k = -mg/Δx,

we can calculate the spring constant for each data point:

For the first data point (m = 0.05 kg, Δx = 0.012 m):

k = -0.05 kg * 9.8 m/s² / 0.012 m

k ≈ -40.833 N/m

Similarly, we can calculate the spring constants for the other data points:

For the mass of 0.05 kg, the spring constant is approximately -40.833 N/m.

For the mass of 0.1 kg, the spring constant is approximately -18.519 N/m.

For the mass of 0.2 kg, the spring constant is approximately -6.154 N/m.

For the mass of 0.3 kg, the spring constant is approximately -3.267 N/m.

For the mass of 0.4 kg, the spring constant is approximately -2.222 N/m.

For the mass of 0.5 kg, the spring constant is approximately -1.716 N/m.

For the mass of 0.6 kg, the spring constant is approximately -1.449 N/m.

Therefore, In the first part of the question, there is no need to convert the mass into kg and the displacement cm into m because it is already given in kg and m respectively, and in the second part question you have to calculate the spring constant using the given equation.

To learn more about Mass click:

https://brainly.com/question/31247796

#SPJ1

We can use the following data to get the values of acceleration and the distance covered at top speed:

Maximum speed is 20 m/s (v_max).

Time (t) = 21 seconds

(d) = 270 m is the total distance travelled.

Find the acceleration (A) first:

Applying the equation v = u + at

where an is the acceleration, t is the elapsed time, u is the beginning velocity, and v is the end velocity.

Given: The bus will begin at rest with an initial velocity of 0 metres per second (u).

The formula can be rearranged as follows:

a = (v - u) / t

a = (20 m/s - 0 m/s) / 21 seconds

0.952 m/s2 a = 20 m/s / 21 sec

Therefore, the acceleration of the bus is approximately 0.952 m/s².

Next, let's find the distance traveled at maximum speed (B):

Since the bus starts from rest, it takes time to accelerate to its maximum speed and then decelerate to stop. The distance traveled at maximum speed can be found by subtracting the distances covered during acceleration and deceleration from the total distance.

Distance during acceleration = (1/2) * a * t^2

Distance during deceleration = (1/2) * a * t^2

Distance traveled at maximum speed = Total distance - (Distance during acceleration + Distance during deceleration)

B = d - (0.5 * a * t^2 + 0.5 * a * t^2)

B = 270 m - (0.5 * 0.952 m/s² * (21 sec)^2 + 0.5 * 0.952 m/s² * (21 sec)^2)

B = 270 m - (0.952 m/s² * (21 sec)^2)

B = 270 m - 220.392 m

B ≈ 49.608 m

Therefore, the distance traveled at maximum speed is approximately 49.608 m

For more such question on acceleration

https://brainly.com/question/460763

#SPJ11

The electric potential energy of the system depends on all three quantities listed: q, Q, and q's location relative to the group of charges.

The electric potential energy of the system is directly proportional to the magnitude of the charge q, so it depends on the value of q.

The electric potential energy of the system is directly proportional to the total charge Q of the group of source charges, so it depends on the value of Q.

The electric potential energy of the system depends on the location of the charge q relative to the group of source charges, because the electric potential energy is a function of the distance between q and the source charges. Specifically, the electric potential energy of the system will be higher when the distance between q and the source charges is smaller, and lower when the distance is larger.

To learn more about Electric potential energy :https://brainly.com/question/16890427

#SPJ4

Answer:

Fc = m v^2 / R     horizontal force required to keep ball in circle

Fv = m g       vertical force on ball due to weight

tan θ = Fc / Fv = v^2 / (R * g)       angle from verticle

Circumference of circle = 2 π R

v = 4 π R        distance traveled / sec

v^2 = 16 π^2 R^2

tan θ = 16 π^2 R / g

tan θ = 16 *  π^2 * .3 / 9.80 = 4.83

θ = 78.3 deg from vertical

Hendry and Cathy will each throw an object, and the time and location at which they will collide can be determined using the laws of motion. Hendry's item had an initial velocity of 26.5 m/s, whereas Cathy's object had an initial velocity of 45 m/s. Hendry's object's equation of motion is given by: s = u*t + 0.5*a*t*2, where s is the displacement, u*t* is the starting velocity, t* is the time, and a*t* is the acceleration brought on by gravity.

The acceleration caused by gravity is negative since the item is being flung upward. The item that Cathy threw has the following equation of motion: s = u * t - 0.5 * a * t2.where s is the distance travelled, u is the starting speed, t is the passage of time, and an is the acceleration brought on by gravity. The acceleration caused by gravity is negative since the item is being flung upward.

These equations allow us to determine the location and timing of the two items' collision. By figuring out the two equations for t, one may determine the moment when the objects will collide. By changing the value of t in either equation, one may determine the distance at which the objects will collide. Therefore, using the equations of motion, it is possible to determine the moment and distance at which the two objects will collide.

Learn more about  velocity  at:

https://brainly.com/question/17127206

#SPJ1

Answer:The most common welding methods for automotive jobs include resistance metal inert gas (MIG) welding, plasma arc welding (PAW) and tungsten inert gas (TIG) welding. Learn more about MIG Welding and Other Common Welding Types.

There are various type of welding equipment that are commonly used in automotive shops.the most common form of welding used for automobiles are tungsten inert gas welding (TIG),metal inert gas welding(MIG) and shielded metal arc welding.

It is a type of manual arc welding process which utilizes a consumable electrode covered with flux to protect the weld bead.For SMAW either direct current or alternating current can be used to form the electric arc. The electrode melts and forms a molten weld pool with the base metal by using the thermal energy produced from the electric arc.The weld bead in Shielded metal Arc Welding is formed by the electrode wire core mixing with the molten base metal.

Auto body specialists perform structural repairs on a range of cars and equipment using a variety of automotive welding techniques. They might also create a metal part to enhance an existing building. The most popular welding techniques for automotive projects are tungsten inert gas (TIG), plasma arc, and resistance metal inert gas (MIG) welding.

Thus,There are various type of welding equipment that are commonly used in automotive shops such as Auto-Darkening Welding Helmet Welding Gloves, MIG Welding Pliers, Welding Magnets, Chipping Hammer,Welding,Framing Jig,Metal Brush,Angle Grinder,Metal File,Welding Boots,Safety Glasses and MIG Welding Nozzle Gel.

Learn more about Shielded Metal Arc Welding (SMAW) from here

brainly.com/question/14994590

#SPJ6

Answer:

a) F_{net } = 5 i ^ N ,   b) F_{net } = 5 N,  θ = 0

Explanation:

Force is a vector magnitude, one of the easiest methods to work with it is to use its Cartesian components and perform the sum on each axis in scalar form.

Therefore we will create a coordinate system and sum on each axis

X axis

          \(F_{net x}\) = F₁ + F₂

where they indicate the value of each one

F₁ = 15 N i ^

F₂ = -10 N i ^

where on the x-axis the direction to the right is positive

           F_{net x} = 15 - 10

           F_{net x} = 5 N

Y Axis

          F_{net y}  = F₃ + F₄

the values ​​of this force are given and the upward direction is taken as positive

   F₃ = 20 N j ^

   F₄ = -20 N j ^

we calculate

           F_{net y} = 20 -20

           F_{net x} = 0

we can give the result in two ways

a) F_{net } = 5 i ^ N

b) in the form of module and angle.

Let's use the Pythagorean theorem

        F_{net }² = F_{net x}² + F_{net y}²

        F_{net }² = 5² + 0²

        F_{net } = 5 N

we use trigonometry for the angles

        tan θ = F_{net yy} / F_{net y}

        θ = tan⁻¹ (0/5)

         θ = 0

Answer:

The carbon dioxide levels have increased due to burning fossil fuels

Explanation:

Correct on edge 2021 hope this helps!✌️

The gas in Earth's atmosphere that has increased over time due to burning fossil fuels is carbon dioxide.

Global warming is defined as the phenomenon of heating up of the earth's surface in a long term due to the increased amount of emission of green house gases in the earth's atmosphere.

Here,

When more fossil fuels and the materials like coal are burned for the purpose of energy production, it will result to the production of an increased amount of carbon dioxide. This leads to the emission of huge amount of carbon dioxide in the earth's atmosphere. Since, carbon dioxide is a green house gas, the release of higher amount of carbon dioxide will lead to an increased concentration of green house gases. This causes an increase in the temperature of the atmosphere, resulting in the increased heating of the surface of earth. This uneven heating up of  earth's surface is called global warming. This is the result of higher release of carbon dioxide in the earth's atmosphere.

Hence,

The gas in Earth's atmosphere that has increased over time due to burning fossil fuels is carbon dioxide.

To learn more about global warming, click:

https://brainly.com/question/12908180

#SPJ7

Answer:

Given,

Force = 441 N

mass = ?

Keep in mind that acceleration due to gravity is constant 10m/s.

Force = mass × acceleration due to gravity

mass = Force / acceleration due to gravity

m = 411 N /10m/s

m = 41.1 kg

Therefore her Jenny mass is 41.1 kg.

Refers to the attachment for the answer.

Let us assume that the object of mass m is kept on the Inclined plane.

Now, there will act one force called as Component of the Weight along the Incline which is given by the Relation,

mgsinθ,

where θ is the angle which the incline makes with the surface or Angle of the Incline.

Now, If there will be no friction and the object is moving along the incline

Force = mgsinθ

⇒ ma = mgsinθ

∴ a = gsinθ

This case is valid when the angle of the Incline is greater than the angle of repose, which means the object is moving with no cause or acing of the force.

But sometimes when the object does not move without the action of force, I mean that the angle of repose is greater than the angle of the incline, then we need to apply the force so that the object can move then,

Force applied = mgsinθ

∴ a = gsinθ

It will change the cases when friction is involved.

Now, For velocity, It can be found by using the equation of Motions. Time, Distance or initial velocity, etc must be given if the question will be asked related to the velocity. So by using them, you can find that.

-a: Is correct, to remaind the speed of light constant distance and time have to change porportional. The speed represents a rate of change between distance and time.

-b: Incorrect, space (distance) can be curved and tiem remainds constant, and the space-time exist

-c: It is not tested jet

Answer is A

part a.  the wavelength of this wave  is 26 cm

part b. The amplitude (A) of a wave is 9 cm

The wavelength (λ) of a wave is described as the distance between two consecutive points on the wave that are in phase.

In this scenario, the distance between two corresponding points on the wave will be equal to the horizontal distance from crest to trough, which is 26 cm.

Hence, the wavelength of the wave is: λ = 26 cm

The amplitude (A) of a wave is described as the maximum displacement of a particle from its rest position as the wave passes through it.

In this scenario, the vertical distance from crest to trough is 18 cm, which is equal to twice the amplitude.

Learn  more about  amplitude at:

https://brainly.com/question/3613222

#SPJ1

The electron number cannot be used instead because electrons can be removed from or added to an atom (option C)

The element of an atom is determined by its proton count, while the electron count can exhibit variability. Take, for instance, a sodium atom, which encompasses 11 protons and 11 electrons. However, it has the capacity to relinquish one electron, transforming into a sodium ion housing only 10 electrons.

This occurs due to the relatively loose binding of electrons to the nucleus, enabling their removal through the influence of an electric field or alternative mechanisms.

Learn about electron here https://brainly.com/question/13998346

#SPJ1

Answer:

12 ounces of beer plus 12 ounces of wine plus 3 ounces of liquor are equivalent to 6 drinks.

Explanation:

In the United States, a standard "drink" of beer has 12 ounces, a standard "drink" of wine has 5 ounces and standard drink of liquor has 1.5 ounces. Then, we obtain the quantity of drinks by dividing the total volume of each drink by its respective unit volume and summing each term. That is:

\(N = \frac{12\,oz}{12\,\frac{oz}{dr} }+\frac{12\,oz}{5\,\frac{oz}{dr} }+\frac{3\,oz}{1.5\,\frac{oz}{dr} }\)

\(N = 1\,dr+2.4\,dr+2\,dr\)

\(N = 5.4\,dr\)

\(N = 6\,dr\)

12 ounces of beer plus 12 ounces of wine plus 3 ounces of liquor are equivalent to 6 drinks.

The water purification procedure, such as filtration, sedimentation, distillation, etc.

Analysis of the reduction in microbes that is enough to protect against the transmission of pathogens in water is debated below. Chlorination is the most widely used method for disinfecting water supplies in the United States.

The most efficient way to desalinize salt water is by using a method called distillation. This is where you boil the water and then assemble the condensation. The steam will provide fresh salt-less water for you to drink.

So we can conclude that Chlorination is the activity of adding chlorine to drinking water to kill parasites bacteria and viruses.

Learn more about water here: https://brainly.com/question/1313076

#SPJ1

Answer:

Explanation:

To calculate the elastic potential energy stored in the flea's legs before the leap, we need to use the conservation of energy principle, which states that the total energy of a system is constant.

Initially, the flea was at rest on the dog's cranium, so it had zero kinetic energy. However, it had some elastic potential energy stored in its legs due to the compression of its leg muscles before the leap. This energy was converted into kinetic energy as the flea jumped.

At the highest point of the flea's trajectory, it had reached its maximum height, so it had zero kinetic energy. However, it had some gravitational potential energy due to its height above the dog's cranium. This energy was equal to the amount of elastic potential energy stored in its legs before the leap.

Using the conservation of energy principle, we can equate the elastic potential energy stored in the flea's legs to its gravitational potential energy at the highest point of its trajectory:

Elastic potential energy = Gravitational potential energy

1/2 kx^2 = mgh

where k is the spring constant of the flea's leg muscles, x is the distance the flea's legs were compressed before the leap, m is the mass of the flea, g is the acceleration due to gravity, and h is the maximum height of the flea's trajectory.

We need to express all the quantities in SI units:

m = 0.10 g = 0.0001 kg

v = 1.25 m/s

h = 5.00 cm = 0.05 m

g = 9.81 m/s^2

To determine k and x, we need to use the fact that the kinetic energy of the flea at the moment of the leap is equal to the elastic potential energy stored in its legs:

1/2 mv^2 = 1/2 kx^2

Solving for x:

x = sqrt(mv^2/k)

Substituting the known values:

x = sqrt(0.0001*1.25^2/k)

Now, we can substitute the values of m, x, and h into the equation for the elastic potential energy:

1/2 kx^2 = mgh

1/2 k (0.00011.25^2/k) = 0.00019.81*0.05

0.000078125 k = 0.00004905

k = 0.627 N/m

Finally, we can substitute the value of k and x into the equation for the elastic potential energy:

1/2 kx^2 = 1/20.627(0.0001*1.25^2/k)^2

Elastic potential energy = 0.0000156 J

Therefore, the elastic potential energy stored in the flea's legs before the leap was 0.0000156 J.

Answer:

a) we can form a triangle in order to use the Pythagorean theorem = 3² + 1² = h²

h² = 9 + 1 = 10

h = √10

h = 3.1623 blocks

we must also find the angle at the initial point of the triangle (A):

tan⁻¹ (1/3) = 18.43°    

the position relative to her starting position is 90° - 18.43° = 71.57° north of east

b) total distance traveled = 6 + 3 + 7 = 16 blocks

Answer:

Boiling water is an example of a physical change and not a chemical change because the water vapor still has the same molecular structure as liquid water.

(credits to lumenlearning)

Explanation:

Answer:

boiling of water forms steam which can be further condensed to form water again, thus this change is a temporary and reversible change

Answer:

mine is 9.75 so take that as you will

Explanation:

Answer:

Explanation

Rotational kinetic energy of the earth = 1/2 Iω²

where I is moment of inertia of the earth and ω is angular velocity .

I = 2/5 m R² , m is mass and R is radius of the earth .

I = 2/5 x 5.98 x 10²⁴ x ( 6.38 x 10⁶ )²

=97.36 x 10³⁶

ω = 1 / T

T = 24 x 60 x 60 = 86400 s

ω = 1 / 86400

= 11.57 x 10⁻⁶ rad / s

Rotational Kinetic energy = 1/2 Iω²

= .5 x 97.36 x 10³⁶ x (11.57 x 10⁻⁶ )²

= 6516.54 x 10²⁴ J

1. Galileo.

2. Newton.

3. Kepler.

4. Brahe.

5. Refracting telescope.

6. Reflecting telescope.

7. Astrolabe

8. Camera.

9. Radio telescope.

1. Galileo, who uncovered information about the lunar surface.

2. The first reflecting telescope was created by Newton.

3. Kepler discovered elliptical orbits for planets.

4. Brahe: He meticulously mapped the sky.

5. A large glass lens is used in a refractive telescope.

6. A reflecting telescope concentrates light using a mirror.

7. Astrolabe: a device used to pinpoint a star's location.

8. Camera: a device that gathers light from an item to display greater detail.

9. The sound of stars is captured by radio telescopes.

Complete question:

The complete questions is (see in attachments).

To learn more about Telescope visit: https://brainly.com/question/556195

#SPJ4

Answer:

C. Overload circuit

Explanation:

Sana ka tulong mark me brainliest plsss thnks

Videos can be streamed from the cloud to a computer with no loss in quality because Digital signals are used to transmit data to and from the cloud.

How do digital signals work?

An established or one that represents data as a step made up of discrete values is known as a digital signal. There is no noise produced by digital signals. Electronic signals sent as pulses are used to transmit digital signals to computers. These signals can be found in things like digital phones and computers.

Because digital signals are used to transport data to and from the cloud, it should be noted that videos are said to stream from the cloud to a computer without quality degradation.

Videos can be streamed from the cloud to a computer with no loss in quality because Digital signals are used to transmit data to and from the cloud.

To know more about Digital signals, check out:

https://brainly.com/question/28160561

#SPJ1

Answer:

they both are the mixture of substance

Answer:

a homogeneous mixture is a uniform mixture whose components appear to be in a single state while a heterogeneous mixture is non uniform mixture whose components remain separate

Explanation:

example of homogeneous_ water and ethanol

heterogeneous_ water and chalk

Complete question:

A person holds a 0.300 kg pomegranate at the top of a tower that is 96m high. Another person holds a 0.800 kg melon next to an open window 32m up the tower.

Calculate the gravitational potential energy of the pomegranate and melon.

Answer:

The gravitational potential energy of  pomegranate is 282.24 J

The gravitational potential energy of  melon is 250.88 J

Explanation:

Given;

mass of the  pomegranate, m₁ = 0.3 kg

height of the  pomegranate, h₁ = 96 m

mass of the melon, m₂ = 0.8 kg

height of the melon, h₂ = 32 m

The gravitational potential energy of  pomegranate is calculated as;

P.E₁ = m₁gh₁

P.E₁ = 0.3 x 9.8 x 96

P.E₁ = 282.24 J

The gravitational potential energy of  melon is calculated as;

P.E₂ = m₂gh₂

P.E₂ = 0.8 x 9.8 x 32

P.E₂ = 250.88 J

the one that answered this is correct so give him credit not me

Answer:

Complete question:

A person holds a 0.300 kg pomegranate at the top of a tower that is 96m high. Another person holds a 0.800 kg melon next to an open window 32m up the tower.

Calculate the gravitational potential energy of the pomegranate and melon.

The gravitational potential energy of  pomegranate is 282.24 J

The gravitational potential energy of  melon is 250.88 J

Given;

mass of the  pomegranate, m₁ = 0.3 kg

height of the  pomegranate, h₁ = 96 m

mass of the melon, m₂ = 0.8 kg

height of the melon, h₂ = 32 m

The gravitational potential energy of  pomegranate is calculated as;

P.E₁ = m₁gh₁

P.E₁ = 0.3 x 9.8 x 96

P.E₁ = 282.24 J

The gravitational potential energy of  melon is calculated as;

P.E₂ = m₂gh₂

P.E₂ = 0.8 x 9.8 x 32

P.E₂ = 250.88 J

the one that answered this is correct so give him credit not me