As the train in the image moves to the right, which person hears the train horn at a lower pitch?​

[tex] \bf \underline{Given :-}[/tex]

[tex] \sf{• \: An  \: electric \:  heater \:  draws  \: a  \: current  \: of  \: 5  \: ampere \:  from \:  220  \: volt \:  supply.}[/tex]

[tex] \\ [/tex]

[tex]\bf{ \underline{To \:  Find:- }}[/tex]

[tex] \sf• \: ( a)  \: lts  \: resistance.[/tex]

[tex] \sf• \: (b) \:  electrical  \: energy  \: consumed  \: in \:  kwh \:  if  \: it  \: is  \: used  \: for \:  4  \: hours.[/tex]

[tex] \\ [/tex]

[tex]\huge\bf{ \underline{ Solution :-}}[/tex]

[tex] { \boxed{\bf{(a)}}}[/tex]

[tex] \sf•  \: Current  \: (I) = 5 \: A[/tex]

[tex] \sf• \: Voltage \: (V) = 220 \: v[/tex]

[tex] \bf \red{\bigstar{\: Formula \:  of \:  Resistance \: (R) =  \frac{V}{I} }}[/tex]

[tex] \sf \rightarrow  R = \frac{220}{5} [/tex]

[tex] \sf \rightarrow R =44[/tex]

[tex] \bf{Hence,  \: it's  \: resistance \:  is  \:  \: 44 \:  Ω \: .}[/tex]

[tex] \\  \\ [/tex]

[tex] { \boxed{\bf{(b)}}}[/tex]

[tex] \sf•  \: Current  \: (I) = 5 \: A[/tex]

[tex] \sf• \: Voltage \: (V) = 220 \: v[/tex]

[tex] \bf \red{\bigstar{\: Formula  \: of \:  Electric  \: Power \:  (P) = IV  }}[/tex]

[tex] \sf \rightarrow P = (5  \times 220) [/tex]

[tex] \sf \rightarrow P = 1100 \:[/tex]

[tex] \\ [/tex]

[tex] \sf \therefore \: P = 1100 \: watt[/tex]

[tex] \sf{• \: Time  \: (t) = 4  \: hours }[/tex]

[tex] \bf \red{\bigstar{ \: Formula  \: of  \: Energy  \: (W) = Pt}}[/tex]

[tex] \sf \rightarrow W= 1100  \times  4[/tex]

[tex] \sf \rightarrow W = 4400[/tex]

[tex] \sf \rightarrow W  =  \frac{4400}{1000} [/tex]

[tex] \sf \rightarrow W  =  4.4[/tex]

[tex] \sf \therefore W  =  4.4 \: kwh[/tex]

[tex] \bf{Hence,  \: Electrical  \: Energy \:  is \:  4.4  \: kwh.}[/tex]

Answer is 4.4 kwh.

hope it helps you.

Answer:

The total distance the particle travels in one period is approximately 1.131 m

Explanation:

The Simple Harmonic Motion (SHM) of an object can be conceptualized as the uniform circular motion of the object projected on an axis

Therefore, the amplitude of a SHM which is the largest displacement of the motion from its central or equilibrium position is equivalent to the radius of the circular motion

Therefore;

The amplitude of the SHM, a = 0.18 m = The radius of the equivalent circular motion, r

A period of SHM = The time it takes takes to complete one revolution

Therefore, the total distance traveled in one period = The length of 1 complete revolution = The circumference of the equivalent circle describing the SHM

The circumference of the equivalent circle describing the SHM, C = 2·π·r

By substituting the known value for the radius, 'r', we have;

C = 2·π·r = 2 × π × 0.18 m ≈ 1.131 m

Therefore, the total distance the particle travels in one period ≈ 1.131 m

Answer:

If the body is in equilibrium the two forces add up and the third is the opposite of the resultant.

F(1x)=F(1)=10 N

F(2x)=F(2)cos60=5•0.5=2.5 N

F(2y) =F(2)sin60 = 5•0.866= 4.33 N

F(3x) =- F(x)=- (10+2.5 )= -12.5 N

F(3y) =- F(2y)= - 4.33 N

F(3) = sqrt{ F(3x)²+F(3y)²} =13.23 N

tan φ = F(3y)/F(3x) =4.33/12.5=0.364

φ = 19.1⁰ (south-west)

Explanation:

Kinetic Energy. Energy is transferred from one object to another when a reaction takes place. Energy comes in many forms and can be transferred from one object to another as heat, light, or motion, to name a few. For the blue ball to move to the position of the green ball, energy must be given to the blue ball.

Answer:

If you break a rib in the middle of your rib cage, the sharp end of bone could puncture a lung. If you break a rib toward the bottom of your rib cage, the sharp end of the bone could cause damage to your liver, kidney, or spleen.

Explanation:

Hope this helped..

Answer:

the acceleration of the car is -5 m/s².

Explanation:

Given;

initial velocity of the car, u = 50 m/s

time of motion, t = 6 s

final velocity of the car, v = 20 m/s

The acceleration of the car is calculated as;

[tex]a = \frac{v-u}{t} \\\\a = \frac{20-50}{6} \\\\a = - 5 \ m/s^2[/tex]

Therefore, the acceleration  of the car is -5 m/s².

battery

Explanation:

Electromagnets can be created by wrapping a wire around an iron nail and running current through the wire. The electric field in the wire coil creates a magnetic field around the nail. In some cases, the nail will remain magnetised even when removed from within the wire coil

Answer:

Light Bulb

Explanation:

I did the quiz and i got it right

[tex]\huge{\textbf{\textsf{{\color{pink}{An}}{\red{sw}}{\orange{er}} {\color{yellow}{:}}}}}[/tex]

An object at rest stays at rest and an object in motion stays in motion at a constant speed and direction unless acted upon by an unbalanced force. ... In the absence of any forces, no force is required to keep an object moving.

In everyday situations, it does seem that a force is needed to keep an object moving at a constant speed in a straight line because the resistive frictional force acted on every objects against their motion.

The resistance provided by surfaces in touch as they move past one another is known as friction.

According to Newton's first law of motion, Unless forced to change its condition by an outside force, every object will continue to be at rest or moving uniformly in a straight line.

But in  everyday situations, it does seem that a force is needed to keep an object, for example the shopping trolley, moving at a constant speed in a straight line because of the frictional resistive force acting opposite to the motion. That's why, a force of equal magnitude and opposite direction must be applied on the object, so that, resultant force becomes zero. It can at a constant speed in a straight line.

Learn more about friction here:

https://brainly.com/question/13000653

#SPJ2

Answer:Aplitude

Explanation:

a p e x

Answer:

0.3 hour

Explanation:

From the question given above, the following data were obtained:

Distance travelled = 90 km

Speed of 1st car = 50 km/h

Speed of 2nd car = 60 km/h

Time interval separating the two cars =?

Next, we shall determine the time taken for each car to get to the destination. This can be obtained as follow:

For the 1st car:

Distance travelled (d) = 90 km

Speed of 1st car (S₁) = 50 km/h

Time (t₁) =?

Speed = Distance /time

S₁ = d/t₁

50 = 90 / t₁

Cross multiply

50 × t₁ = 90

Divide both side by 50

t₁ = 90 / 50

t₁ = 1.8 hours

For the 2nd car:

Distance travelled (d) = 90 km

Speed of 2nd car (S₂) = 60 km/h

Time (t₂) =?

Speed = Distance /time

S₂ = d/t₂

60 = 90 / t₂

Cross multiply

60 × t₂ = 90

Divide both side by 60

t₂ = 90 / 60

t₂ = 1.5 hours

Finally, we shall determine the time interval separating the arrival of the two cars. This can be obtained as follow:

Time for the 1st car (t₁) = 1.8 hours

Time for the 2nd (t₂) = 1.5 hours

Time interval separating the two cars (tₛ) =?

tₛ = t₁ – t₂

tₛ = 1.8 – 1.5

tₛ = 0.3 h

Thus, the interval separating the arrival of the two cars is 0.3 hour

Answer:

The resultant force is the single force that would produce the same effect on an object as two or more forces that are applied to the object. To find the resultant force, first draw a free body diagram, which is a diagram that shows all the applied forces using arrows in the direction of each force.

Answer:

2 the molecules will move faster

Explanation:

the heat from the pay gives the molecules now energy causing the to spread out and move faster

Answer:

b. light from earth is reflected by the moon surface

Answer:

C. Light from the sun is reflected by the moon's surface

Explanation:

In some parts the Light reaches, it gets lighted up and the parts where light does not reaches we can't see so we see the phrases of the moon .

Answer:

Plantae. Also called the Kingdom Metaphyta, the Kingdom Plantae consists of all multicellular, eukaryotic, and photosynthetic organisms on the planet. Being photosynthetic, these organisms are autotrophs and can make their food using the energy from the sun.

Answer:

Electromagnetic

Explanation:

Electromagnetic waves are those waves that do not require any material medium for propagation. They arise from a vibration of electric and magnetic fields.

The electromagnetic spectrum is comprised of many waves. One of the waves in the spectrum is visible light.

Visible light is in turn composed of seven different wavelengths of which green light is one of them. Hence, green light travels by electromagetic wave.

Answer:

really fast? xP

Explanation:

Answer:

b

Explanation:

The radiation is reflected by the ice and then absorbed by the atmosphere.

Answer:

B

Explanation:

I got it right on my assignment

Answer:

2 or more atoms

Explanation:

yes yes yes yes yes yes yes yes

Answer:

Two or more

Explanation:

It's mostly two but unique structures might compose of more than 2

Explanation:

The reason time zones are 15 degrees wide is because there are 24 hours and 360/24 = 15. As you move east by 15 degrees the sun’s position in the sky changes relative to us and it looks an hour later in the day, so we advance our clocks to match the sun’s position.

So every 15° eastward one hour ahead.

Answer:

Rolling Friction (round object on a flat surface)  Speeding up.

Explanation:

Gravity continually pulls something such as a table, roster, or person down from the hill. Thus, when you bounce, gravity makes you to arrive on the territory. Friction, however, doesn't pull something down. Friction, however, doesn't pull something downstairs. ... Also, friction always operates identically to the surface in connection because of the sliding movement.

Answer:

A. Crust

B. Mantle

C. Outer Core

D. Inner Core

Explanation:

Answer:

A. Crust

B. mantle

C. outer core

D. inner core

Explanation:

because it is

Answer:

 V = 2.52 10³ V

Explanation:

The electric potential for a point charge is

       V = k ∑ [tex]\frac{q_i}{r_i}[/tex]

In this case the formula is

       V = k ([tex]\frac{q_1}{r_1} + \frac{q_2}{r_2}[/tex])

distances are the absolute value

       r₁ =√ (7.1 -0)² = 7.1 m

       r₁ =√ (7.1 - 14.3)² = 7.2 m

we substitute

       V = 9 10⁹ (q₁ / 7.1 + q₂ / 7.2)

we have two possibilities

* different charges

         V = 9 10⁹ (q₁ / 7.1 + q₂ / 7.2)

* equal charges and same sign

          q₁ = q₂ = q

         V = 9 10⁹ q (1 / 7.1 + 1 / 7.2) = p 9 10⁹   0.2797

         V = 2.52 10⁹ q

if we assume a value of the charge, for example q = 1 10⁻⁶ c

           V = 2.52 10⁹ 1 10⁻⁶

            V = 2.52 10³ V

Answer:

Explanation:

Some of the factors affecting intensity are: The energetic intensity of the source (the initial volume). The distance from the source (the volume at any point along the path). Any modifying elements in the light path (air, clouds, filters, reflectors, etc.) The factors affecting the intensity of light are diffraction.

Light has three properties: Wavelength, speed, and amplitude. The wavelength determines the type of light (color, etc.). Speed is determined by whether light passes through a vacuum or some material. The more photons emitted per unit time, the greater the intensity of the light. Directly, it is the power that determines the brightness of a bulb. That is why light bulbs have a power rating, i.e. a 60W bulb is enough to light a typical bedroom. But power is determined by the current and voltage which, in turn, is determined by the current.

Answer:

It is not still true that the average velocity of the particle is equal to half the sum of the initial and final velocities when the acceleration of the particle is not constant

Explanation:

The motion of a particle under constant acceleration, 'a', is be given by the following kinematic equations;

v² = u² + 2·a·s

v = u + a·t

Where;

v = The final velocity of the particle

u = The initial velocity of the particle

a = The acceleration of the particle

s = The distance through which the particle travels

t = The time of motion of the particle

By simplifying the above equation, we have;

v² - u² = 2·a·s

(v² - u²)/(2·a) = s

(v - u) × (v + u)/(2 × a) = s

((v - u)/a) × ((v + u)/2) = s

From v = u + a·t, we have;

t = (v - u)/a

∴ ((v - u)/a) × ((v + u)/2) = t × ((v + u)/2) = s

∴ ((v + u)/2) = s/t

The average velocity = (Total distance traveled by the particle) ÷ (The time of travel of the particle)

∴ The average velocity = s/t = ((v + u)/2) = Half the sum of the initial and final velocity

However, it is not still true that the average velocity of the particle is equal to half the sum of the initial and final velocities when the acceleration of the particle, 'a', is not constant, as the velocity time graph is no longer a straight line graph and the distance traveled by the particle, 's', which is the area under the velocity time graph, 'A', (given by the sum of area of the triangle and the rectangle given by the area under straight line graph for constant velocity) cannot be given directly by the product of the time and the average velocity.