What is the answer to this question?

Answer:

a. 1.062 × 10⁻⁹ C/m² b. 5.472 × 10⁵ C c. 7.685 × 10⁹ V d. -210.12 V e. 4.972 × 10³ N f. F the electric force is much less than the gravitational force F₁ of the earth on the moon.

Explanation:

a. The surface charge density D = ε₀E where E = 120 N/C

D = ε₀E = 8.854 × 10⁻¹² F/m × 120 N/C = 1.062 × 10⁻⁹ C/m²

The charge density is positive since the electric field is positive or directed downwards. Only a positive charge could direct an electric field out of itself.

b. Since the surface charge density is uniform over the planet and charge, Q = DA where A = area of earth = 4πr² where r = radius of earth = 6.4 × 10⁶ m.

So Q = DA

= 1.063 × 10⁻⁹ C/m² × 4π × (6.4 × 10⁶ m)²

= 5.4715 × 10⁵ C

≅ 5.472 × 10⁵ C

c. The earth's electric potential due  to this charge Q is V = Q/4πε₀r

= 5.472 × 10⁵ C ÷ (4π × 8.854 × 10⁻¹² F/m × 6.4 × 10⁶ m)

= 5.472 × 10⁵ C ÷ 712.081 × 10⁻⁶ F

= 0.07685 × 10¹¹ V

= 7.685 × 10⁹ V

= 7.685 GV

d. Since V = Q/4πε₀r, and we are going to be dealing with a small change in length compared to r, we differentiate V to get the differential change in potential.

So, dV/dr = -Q/4πε₀r²

dV = -Qdr/4πε₀r² ,dr = 1.75 m

dV = -5.472 × 10⁵ C × 1.75 m ÷ [4π × 8.854 × 10⁻¹² F/m × (6.4 × 10⁶ m)²]

dV = -9.576 × 10⁵ Cm ÷ 4557.318 Fm

dV = -210.124 V

dV ≅ -210.12 V

e. Let Q₁ = charge on moon and Q₂ = charge on earth. Given that Q₁ = 0.273Q₂, the force of attraction between earth and moon is F = Q₁Q₂/4πε₀R² where R = distance between earth and moon = 3.844 × 10⁸ m

F = Q₁Q₂/4πε₀R²  

= 0.273Q²/4πε₀R²

= 0.273 × (5.472 × 10⁵ C)²/ [4π × 8.854 × 10⁻¹² F/m × (3.844 × 10⁸ m)²]

= 8.1744 × 10¹⁰ C²/1644.054 Fm × 10⁴

= 0.004972 × 10⁶ N

= 4.972 × 10³ N

= 4.972 kN

f. The gravitational force between earth and moon F₁ = Gm₁m₂/R² where m₁ = mass of moon = 7.3 × 10²² kg and m₂ = mass of earth = 5.97 × 10²⁴ kg.

F₁ = 6.67 × 10⁻¹¹ Nm²/kg² × 5.97 × 10²⁴ kg × 7.3 × 10²² kg/(3.844 × 10⁸ m)²

= 290.685 × 10³⁵ Nm²/14.776 × 10¹⁶ m²

= 19.67 × 10¹⁹ N

= 1.967 × 10²⁰ N

≅ 2 × 10²⁰ N

Since F₁/F = 1.967 × 10²⁰ N/4.972 × 10³ N = 3.95 × 10¹⁶ ≅ 4 × 10¹⁶.

F the electric force is much less than the gravitational force F₁ of the earth on the moon.

Answer:

short circuit

Explanation:

the current will not pass through the lamp, but it will go through the small wire (less resistance than the lamp)

Answer:

$0.52

Explanation:

Assuming 1 month = 30 days:

110 V × 0.33 A × 6 h × 30 = 6534 Wh

6.534 kWh × $0.08/kWh = $0.52

Answer:

400 meters

Explanation:

using the equation:

Hopefully this helps.

Answer:

true

Explanation:

hope this helped!

Answer:

true :)

Explanation:

Answer:

1. d

2. g

3. b

4. h

5. i

6. e

7. c

8. a

9. j

10. f

Circuits can be closed or open; if closed, by a switch perhaps, electricity can flow, and if open it cannot. When components are wired in series, they are one after the other, which is often inefficient. When components are wired in parallel, there are two separate tracks, two paths for the current to flow through. Conductors like electricity, insulators do not.

Answer:

well..

Explanation:

Liquid can flow but solid cannot because of differences in their properties

property of liquid which lets it flow:

property of solid which tends to obstruct flow:

Hope this helps!

Answer:

A cloud is made up of liquid water droplets. A cloud forms when air is heated by the sun. As it rises, it slowly cools it reaches the saturation point and water condenses, forming a cloud. As long as the cloud and the air that its made of is warmer than the outside air around it, it floats!

Explanation:

A cloud is made up op liquid and water droplets.

Answer:

How are clouds made

Explanation:

When sunlight hits water it evaporates into the air and makes water droplets that we see as white fluufly clouds

Answer:

they both exert the same pressure

Explanation:

Pressure is the ratio of force to area. It is given as:

[tex]P=\frac{F}{A}[/tex] ,  where F is the force, P is pressure and A is area

1) For the cuboid, the area of the base placed on the ground (A) = 8 cm × 3 cm = 24 cm² = 0.0024 m². Therefore the pressure is:

[tex]P=\frac{F}{A}=\frac{60}{0.0024} =25000N/m^2=25KN/m^2[/tex]

2) For the cube, the area of the base placed on the ground (A) = 4 cm × 4 cm = 16 cm² = 0.0016 m². Therefore the pressure is:

[tex]P=\frac{F}{A}=\frac{40}{0.0016} =25000N/m^2=25KN/m^2[/tex]

Therefore, they both exert the same pressure.

Answer:

idk ha ha ha

Explanation:

Answer:

Manage your weight

Have lower blood pressure

Lower your risk of falls

it reduces your risk of heart attack

Answer:

water

Explanation:

both a monkey and a tree need water to survive.

Have a great day

Answer:

They're calibrated to measure, liquids of greatest density.

Explanation:

Answer:

4.5 sec

Explanation:

Initial velocity u = 4 m/s

Final velocity v = 13 m/s

Acceleratiin a = 2 m/s^2

Using v = u + at

Where t is time

13 = 4 + 2t

13 - 4 = 2t

9 = 2t

t = 9/2 = 4.5 sec

Answer:

4.5 s

Explanation:

The initial velocity (u) = 4 m/s, the final velocity (v) = 13 m/s and the acceleration (a) = 2 m/s²

To calculate the time it takes the rabbit to go from 4.0 m/s to 13.0 m/s, we use the formula:

v = u + at

Substituting values to get:

13 = 4 + 2t

Subtracting 4 from both sides:

13 - 4 = 4 + 2t - 4

9 = 2t

Therefore, 2t = 9

Dividing through by 2

2t / 2 = 9 / 2

t = 4.5 s

Therefore it takes the rabbit 4.5 seconds to go from 4.0 m/s to 13.0 m/s

Answer: Food chain: cheese a product of the sun.

Explanation:

Food chain: The energy taken from the sun through photosynthesis enables plants to exist and grow.

The animal like cow takes chemical energy from plants by eating plants product.

The cow is able to produce the milk because of the energy that has been taken from the plant.

Since the cheese came out from the milk, we can therefore conclude that the food is initially a product of the sun.

Answer:

130m/s^2 and 1.22s

Explanation:

From V = u+at

Where V, u, a, and t are the final velocity, initial velocity, acceleration and time respectively.

v = 6.75m/s

u = 3.5m/s

t = 0.250secs

a = ?

V = u+at

6.75= 3.5+a(0.250)

6.75-3.5 = 0.250a

3.25=0.250a

Divide both sides by 0.250

3.25/0.250= 0.250a/0.250

a = 130m/s^2

The acceleration of the will be 130 meter per second

Question 2

Speed = distance/time

Given that speed= 4.25m/s

Distance = 5.2m and time = ?

4.25m/s = 5.2m/t

Cross multiply

4.25×t = 5.2

Make t the subject by dividing both sides by 4.25

4.25t/4.25 = 5.2/4.25

t = 1.22s

Hence the time taken will be 1.22 seconds

Answer:

permanent set

.............

Johann squeezes a bagel too hard that it is not able to return to its original shape. The bagel has Plastic deformation.

Plasticity, also referred to as plastic deformation, is the property of a solid material to undergo permanent deformation, a non-reversible change in shape in response to applied forces.

It is a concept used in physics and materials science. For instance, plasticity is demonstrated when a solid piece of metal is bent or pounded into a new shape because the material itself undergoes lasting modifications. Engineering professionals use the term yield to describe the change from elastic to plastic behavior.

Most materials, especially metals, soils, rocks, concrete, and foams, show signs of plastic deformation.

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Answer:

The actual work output is 1,125 kilojoules.

Explanation:

Energy efficiency is defined as the efficient use of energy. An appliance, process, or facility is energy efficient when it consumes less than the average amount of energy to perform an activity. Then, energy efficiency is the ratio between the amount of energy used in an activity and the amount expected to be carried out.

Efficiency is calculated as:

efficiency = output / input

Where output is the amount of mechanical work (in watts) or energy consumed by the process (in joules), and input (input) is the amount of work or energy that is used as input to carry out the process.

In this case:

Replacing:

0.15=output/7500 kilojoules

Solving:

Output=0.15* 7500 kilojoules

output=1,125 kilojoules

The actual work output is 1,125 kilojoules.

Answer:

Sodium and water

Explanation:

We are given with the word equation :

sodium + water + sodium hydroxide + hydrogen

It is required to find that the reactants of the above equation.

In terms of chemical formula we can write it as :

[tex]Na+H_2O\rightarrow NaOH+H_2[/tex]

Reactant of a chemical equation are the elements that are present on its LHS. These are the components of which the equation is composed of. So, the reactants of the given equation are sodium and water.

The reactant are :

-Reactants are Sodium and water.

-Hence, option b is correct.

Word equation :sodium + water + sodium hydroxide + hydrogen

In terms of chemical formula ,we can write it as :

[tex]Na+H_2O\rightarrow NaOH+H_2[/tex

Reactants In a chemical equation, reactants are the elements that are present on its LHS(left hand side).

So, the reactants of the given equation are sodium and water.

Find more information about reactants and products here:

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Answer:

the vibrations push the purse up and down very fast and gravity pushes the purse down onto the floor

Explanation: does that help

Answer:

Newton's 1st Law

Explanation:

When Jane is driving her purse is being pushed against the seat so when she stops driving it slides forward because of it's mass. So that is why it ends up on the floor.

Answer:

quintal and metric tone.

Explanation:

1 quintal= 100kg

1 metric =1000kg

quintal measures mass of cars, trucks etc, but metric measures bigger things like cargo ships

hope it helps

Answer:

3km? im a beginner

Answer:

It would be hard to make a model that shows the real sizes and distances between planets ( B )

Explanation:

Yuri building a model of the solar system will face the difficult of replicating the correct distances between the planets and the real sizes of the planets, because in model building the key factors of the Model must be represented properly.

The size of the planets and the distance between the planets are key factors when trying to model the solar system. but the distance between the planets depends on the position of the planets on their orbits which means the distances are not constant ( fixed ) hence that  would be the limitation of his model.

Answer:

if you spoke this in english i can help you out

Explanation:

Answer:

Fnet=7200 N

Explanation:

Fnet=mass x acceleration

mass= 1600kg acceleration=4.5m/s^2

Answer:

Net force= 7200 N or 7200 N*m/s^2 (It just depends)

Explanation:

1600 kg x 4.5 m/s^2 = 7200 kg*m/s^2 or 7200 N*m/s^2

Answer:

Explanation:I don't say you to mark my ans as brainliest but if it has really helped you plz don't forget to thank me...

Answer:

90 km/h = 25 m/ s

Explanation:

to understand

1 km = 1000 m

1 h = 60 minutes and since 1 minute = 60 s you can see that 1 h = 60 * 60 s

90 km / h = 90 1000m / 3600 s

90 *1 / 3.6

90/ 3.6

25 m/ s

so 90 km/h = 25 m/ s

(by the way 90 m/s = 3.6 * 90 = 324 km/ h )

Answer: Magnetic and gravitational force

Explanation: When a magnet and an iron nail are kept at a distance,the magnet attracts the nail without touching using magnetic force. In this example, the magnet and the nail are interacting.

The earth pulls the moon towards it and keeps it in orbit without touching it, using gravitational force. In this example,the moon and the earth are interacting.

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Answer:

D. Electromagnetic waves can travel through empty space

Explanation:

After a few Google searches, this answer seems the most correct

Electromagnetic waves differ from mechanical waves by the fact that electromagnetic waves  can travel through empty space.

The electromagnetic radiation consists of waves made up of electromagnetic field which are capable of propogating through space and carry the radiant electromagnetic energy.

The radiation are composed of electromagnetic waves which are synchronized oscillations of electric and magnetic fields . They are created due to change which is periodic in electric as well as magnetic fields.

In vacuum ,all the electromagnetic waves travel at the same speed that is with the speed of air.The position of an electromagnetic wave in an electromagnetic spectrum is characterized by it's frequency or wavelength.They are emitted by electrically charged particles which undergo acceleration and subsequently interact with other charged particles.

Learn more about electromagnetic waves,here:

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Answer:

(b) 102 kg

Explanation:

95 +15/4- 9/4+11/2 = 102 kg