The electromagnet in a motor must rotate consistantly in just one direction to transfor. ectrical energy into mechanical energy. What causes this rotation?

​

[tex]\text{Power,}~ P = \dfrac{\text{Work done}}{\text{Time}}\\\\\\~~~~~~~~~~~~~=\dfrac{8 \times 1000~J}{4 \times 3600~ s}\\\\\\~~~~~~~~~~~~~~=\dfrac{80}{144}\\\\\\~~~~~~~~~~~~~~=0.56~ W[/tex]

Answer:

Explanation:

Energy used is power multiplied by time.

Power is energy used divided by time

8 kj is 8000 j

4 hours is 240 minutes

240 minutes is 14400 seconds

8000j divided by 14400 is 0.55 recurring, measured in watts

The final temperature of the seawater-deck system is 990°C.

The increment in temperature adds up the thermal energy into the object. This energy is Heat energy.

The deck of a small ship reaches a temperature Ti= 48.17°C seawater on the deck to cool it down. During the cooling, heat Q =3,710,000 J are transferred to the seawater from the deck. Specific heat of seawater= 3,930 J/kg°C.

Suppose for 1 kg of sea water, the heat transferred from the system is given by

3,710,000 = 1 x 3,930 x (T - 48.17)

T = 990°C  to the nearest tenth.

The final temperature of the seawater-deck system is 990°C.

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The question on how electromagnets are produced that students may answer to help explain the disparities in the quantity of paper clips taken up by the electromagnets "What is the strength of  electromagnet”

The imbalance of electric charges within or on the surface of a substance, or between materials, is known as static electricity.

Static electricity is generated by Van de Graaff generators. Static does not include acceleration, implying that it is stationary, which pertains to the formation of electric charges.

a)The question on how electromagnets are produced that students may answer to help explain the disparities in the quantity of paper clips taken up by the electromagnets "What is the strength of  electromagnet”

b)The one factor, other than how the electromagnets were manufactured, that influences the quantity of paper clips the electromagnet picks up will be electrostatics.

Hence,the whole activity is about the electromagnets.

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Answer:

V = λ f    (wavelength * frequency)

λ  = V / f = 343 m/s / 262 / s = 1.3 m

Answer:

0.04 °C⁻¹

Explanation:

First, we need to calculate linear expansivity, then after finding that value, we can move on to finding the area expansivity.

=============================================================

Finding Linear Expansivity :

⇒ α = Final length - Original length / (Original length × ΔT)

⇒ α = 9 - 4 / (4 × 70 - 20)

⇒ α = 5 / 5 × 50

⇒ α = 0.02

============================================================

Finding Area Expansivity :

⇒ Area Expansivity = 2 × Linear Expansivity

⇒ β = 2 × α

⇒ β = 2 × 0.02

⇒ β = 0.04 °C⁻¹

Calculate the value of the area expansion of a steel rod of lenght 4cm at 20°c after heating attains another length of 9cm at 70°c.

Area = 0.02

Area Expansity = [tex]0.0 {4}^{ - 1} [/tex]

the fossil informed us about the climatic and geographical changes that occurs in the environment over time.

We can infer about the climate and geographical changes in the environment over time at the mystery fossil dig site because the fossil provides us information about the climatic condition as well as the geography of land when this fossil organism were alive.

So we can conclude that the fossil informed us about the climatic and geographical changes that occurs in the environment over time.

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Answer:

A

Explanation:

did the quiz

Answer:

A

Explanation:

27. The energy , in electronvolts, of an emitted photon when an electron transition from n=3 to n = 2 is  -1.89 eV.

28. The energy of this emitted photon in joules is -3.0278 x 10⁻¹⁹ Joules.

29. The frequency of the emitted photon is 4.572 x 10¹⁴ Hz.

30. The color of light associated with this photon is Red.

It is the number of oscillations per second of the sinusoidal wave.

Given is the Great Nebula in the constellation Orion consists primarily of excited hydrogen gas.

The electrons in the atoms of excited hydrogen have been raised to higher energy levels. When these atoms release energy, a frequent electron transition is from the excited n = 3 energy level to the n = 2 energy level, which gives the nebula one of its characteristic colors.

27. The energy of transition between n = 3 to n = 2 is

E = R h e (1/n₁² - 1/n₂²)    

where R = Rydberg constant and h = Planck's constant.

Substitute the values, we get

E = 1.0974 x 10⁻⁷ x 6.626 x 10⁻³⁴ x 1.6 x 10⁻¹⁹ (1/3² - 1 /2²)

E = -1.89 eV

28. Energy in joules can be obtained by multiplying  1.6 x 10⁻¹⁹ . So we have

E =  -1.89 eV x   1.6 x 10⁻¹⁹ J/eV

E =  -3.0278 x 10⁻¹⁹ Joules

29. Wavelength associated with the photon emitted is

1/λ = R (1/n₂² - 1/n₁² )

Substitute the values, we get

1/ λ  = 1.524 x 10⁶ /m

The frequency is related to the wavelength as

f = c/λ   where c = speed of light

f = 3 x 10⁸ x  1.524 x 10⁶

f = 4.572 x 10¹⁴ Hz

30. The color of light associated with the photon of calculated frequency is Red.

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The mass of a rollercoaster car moving at a velocity of 30 meters/second and has a momentum of 2.5 × 104 kilogram meters/second is 8.3 × 10²kg.

The mass of the roller coaster car can be calculated using the following formula:

P = m × v

Where;

m = 2.5 × 10⁴ ÷ 30

m = 8.3 × 10²kg

Therefore, the mass of a rollercoaster car moving at a velocity of 30 meters/second and has a momentum of 2.5 × 104 kilogram meters/second is 8.3 × 10²kg.

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The length of the immersed part of the wood​ is 0.2m.

The density is the ratio of the mass and the volume of the object. It is denoted by ρ.

ρ = mass/Volume = m/V

Volume = Area of cross-section A x height h

Given is a piece of wood of mass 40g =0.04kg and uniform cross-sectional area A= 2cm² =2x10⁻⁴ m² floats upright in water.

The density of water ,ρ = 1000 kg/m³

The density related to length of part immersed is

1000 = 0.04/ (2x10⁻⁴ x h)

h = 0.2m

Thus, the length of the immersed part of the wood​ is 0.2m.

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Answer:

40 V

Explanation:

 I will assume that  the resistors are

           100 and 3900 and 1000 OHMS    <=====(NOT W)

In series , the resistances add together 100 + 3900 + 1000 = 5000 ohms total

V = IR

I = V / R      so the total current will be   200 v / 5000 ohms = .04 amps

                   this is the current through all of the resistors

      so for the   1000 ohm resistor     V = IR     .04 (1000) = 40 V

The apparent weight of the pilot would be 619.48 N and the speed he would experience at weightlessness is 192. 97 m/s

Apparent weight is a property of object that co-relates to the heaviness of the object.

It differs from the weight of an object as a result of the in-balance between the force acting on the object and an equal but opposite force

Formula:

Apparent weight = Real weight (mg) - m v∧2 ÷ r

Where m = mass

g = acceleration due to gravity = 9.8 m/s²

v = constant velocity = 2. 10 × 10∧2 m/s

r = radius = 3.80 × 10∧3 m

Note that weight = mg

m = weight ÷ g = 623 ÷ 9.8 = 63. 57 kg

a. Apparent wieight = 623 - (63. 57 × 2.10 × 10∧2 × 2.10 × 10∧2) ÷ 3.80 × 10∧3)

= 623 - (63.57 × 210) ÷ 3800

= 623 - 13377 ÷ 3800

= 623 - 3. 52

= 619.48 N

b. At weightless, weight = 0

Speed, V = √g× r = √ 9.8 × 3800 = √37,240 = 192. 97 m/s

Hence, The apparent weight of the pilot would be 619.48 N and the speed he would experience at weightlessness is 192. 97 m/s

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Metals tend to readily lose electrons and form cations. Most of them react with atmospheric oxygen to form metal oxides. However, different metals have different reactivities towards oxygen (unreactive metals such as gold and platinum do not readily form oxides when exposed to air

For sodium

For Magnesium

For potassium

The minimum initial velocity that the ball must have for it to reach the top of the hill is 21 m/s. The correct option is D.

The mechanical energy is the sum of kinetic energy and the potential energy of an object at any instant of time.

M.E = KE +PE

A boy is trying to roll a bowling ball up a hill. The friction is ignored.  The ball must have to reach the top of the hill with a velocity. The acceleration due to gravity, g = 9.8 m/s²

The conservation of energy principle states that total mechanical energy remains conserved in all situations where there is no external force acting on the system.

M.E bottom of hill = M.E on top of hill

Kinetic energy + Potential energy = Kinetic energy  + Potential energy

1/2 mu² + 0 =  0 + mgh

At the top of hill, the velocity will become zero. So, final kinetic energy is zero.

Substituting the values, we have

1/2 x u² = 9.8 x 22.5

u = sqrt [2 x9.8 x 22.5 ]

u= 21 m/s

Thus, the minimum initial velocity that the ball must have for it to reach the top of the hill is 21 m/s.

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Answer:

K1>K2

Explanation:

The main reason behind this is law of conservation of momentum

But

the factor drift velocity affects the scenario.

Drift velocities of electrons is way more than velocities of ions so

Option C

Answer:

I don't know.

Explanation:

I have no idea what you are referring to.

Answer:

340 m/s

At the temperature of 15 degrees Celsius, the velocity of sound is about 340 m/s in air.

Smaller stars, like our sun, die by ejecting their outer layers of gas into space, resulting in the formation of a planetary nebula.

A planetary nebula is formed when a red giant ejects its outer atmosphere. A white dwarf is the carbon core of a star that has lost its photosphere.

This results in a one-of-a-kind and breathtaking creation known as a planetary nebula.

Smaller stars, like our sun, die by ejecting their outer layers of gas into space over a 10,000-year period, leaving behind the star's heated core.

Radiation from the white dwarf causes the gas to shine, resulting in a one-of-a-kind and stunning creation known as a planetary nebula.

The carbon core of a red giant that has evacuated its photosphere as a planetary nebula is a white dwarf.

Hence, Smaller stars, like our sun, die by ejecting their outer layers of gas into space type of star will form a planetary nebula

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Answer:

The dominant theory of the strong fields of magnetars is that it results from a magnetohydrodynamic dynamo process in the turbulent, extremely dense conducting fluid that exists before the neutron star settles into its equilibrium configuration.

How strong is a magnetar magnetic field?

It can generate the most intense magnetic field observed in the Universe. The field strength of a magnetar is one thousand trillion times stronger than Earth's and is so intense that it heats the surface to 18 million degrees Fahrenheit. We only know of about 10 magnetars in the Milky Way galaxy.

Only the horizontal component of the tension force is performing work on the crate. This component has magnitude (50 N) cos(30°) = 25√3 N, so the work done is

(25√3 N) (10 m) = 250√3 N•m ≈ 433 J

The first two steps for finding the magnitude of the resultant vector is find the sum of the two horizontal vectors and the sum of the two vertical vectors.

The resultant of two vectors is determined from Pythagoras theorem is as shown below.

R² = a² + b²

Thus, the first two steps for finding the magnitude of the resultant vector is find the sum of the two horizontal vectors and the sum of the two vertical vectors.

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When we apply pressure on the one side of balloon the other side bulges out due to the movement of gas to other side.

If we press one side of the balloon, the other side bulges out because the gas that present on one side moves to the other side where there is no pressure. The body of balloon is elastic so when we apply pressure the other side bulges out.

So we can conclude that when we apply pressure on the one side of balloon the other side bulges out due to the movement of gas to other side.

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Answer:

The answer is B

Explanation:

When inflation increases, the cost of goods increases. The correct option is B.

Generally speaking, inflation raises the price of products sold. The price of producing and purchasing those things rises together with the prices of goods and services owing to inflation.

This can be attributable to elements like escalating manufacturing costs, rising input costs, and shifting dynamics of supply and demand.

As a result, companies might need to modify their pricing plans to take inflation-related cost increases into account, the cost of goods typically increases when inflation occurs.

Thus, the correct option is B.

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I really hope this is true. also pay no attention to this answer I'm doing it to finish my account

Answer:

True

Explanation:

See picture.

Answer:

the clock hand of watch which have radium-226 for luminance

Answer:

Ultrasound imaging.

Explanation:

It uses high-frequency sound waves to view inside the body.

Answer:

a totally absorbing surface feels radiation pressure

Explanation:

When electromagnetic radiation strikes perpendicular to a flat surface, a totally absorbing surface feels radiation pressure

Answer:

False

Explanation:

Scientific models are not always built to scale and may not be fully accurate