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PolarNik [594]
4 years ago
14

A heating element having a resistance (at its operating temperature) of 148 Ω is connected to a battery having an emf of 523 V a

nd unknown internal resistance. It is found that heat energy is being generated in the resistance of the heating element at a rate of 66.0 W. What is the rate at which heat energy is being generated in the internal resistance of the battery?
Physics
2 answers:
Fudgin [204]4 years ago
7 0

One formula for the power dissipated by a resistor is

Power = (current)² · (resistance)

I have a feeling that this would be a handy formula to use to solve this problem.

66 W = (current)² · (148 Ω)

Current = √(66/148)

Current = 0.668 Ampere

The total power being delivered by the battery is . . .

Power = (voltage) · (current)

Power = (523 volts) · (0.668 Amp)

Total battery power = 349.4 Watts

66 Watts is being dissipated by the heating element.  The rest of the humongous power delivered by the battery is being dissipated by the battery's own internal resistance.

Power = (349.4 - 66)

<em>Power = 283.4 watts</em>

<em></em>

As a working electrical engineer, I'm required to pound on the desk and protest this expensive and unhealthy situation.  

-- The battery is enormous ... 523 V ! ... and must weigh a ton.  

-- The battery itself is using 81% of the power it's being used to deliver.  

-- And all this is just to operate a measly 66W heater !  

-- You can probably get just as much heat out of the heater in the truck you'll need to shlep this battery around to where the heat is needed.

vladimir2022 [97]4 years ago
4 0

Answer:

The correct answer is 283 watts

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There are two possibilities for final stage of extremely massive stars. The first is a
makkiz [27]

Answer: Black hole.

Explanation:

As the massive star "compacts" under its own gravity, it triggers a massive supernova, after this point the remains of the star can become a neutron star, which is a very compact star made primarily, as the name says, of neutrons. The other possibility is a black hole, which is a finite region of space wherein it's interior there is a big concentration of mass, which creates a gravitational field strong enough that there is no particle that can escape it.

3 0
3 years ago
Thought Experiment: A monkey escapes from a zoo and climbs a tree. After failing to entice the monkey down, a zookeeper fires a
Andreyy89

Explanation:

When bullet is shot towards the monkey then let say the distance of monkey from the bullet is "d"

so we can find the time to reach the bullet to the monkey

t = \frac{d}{vcos\theta}

Now similarly we can find the vertical displacement of the bullet in the same time

\Delta y = vsin\theta t - \frac{1}{2}gt^2

\Delta y = v sin\theta (\frac{d}{vcos\theta}) - \frac{1}{2}gt^2

so it is given as

\Delta y = d tan\theta - \frac{1}{2}gt^2

here if the monkey is initially at height H above the ground at given angle then we can say

H = dtan\theta

so we can say that

\Delta y = H - \frac{1}{2}gt^2

So if at the same time monkey will fall down then the height of monkey from ground after time "t" is given as

\Delta y = H - \frac{1}{2}gt^2

so here bullet will hit the monkey as both monkey and bullet are at same position.

3 0
3 years ago
Which landscape will erode more quickly? Assume the same precipitation and average temperature in each landscape.
Artemon [7]

Answer:

  B.  Landscape B

Explanation:

Shale is fine sediment pressed together to form rock.

Sandstone is larger (sand-grain-sized) sediment cemented together to form rock.

Shale erodes faster, as evidenced by the second attachment. That attachment shows erosion of a rock face consisting of interbedded shale and sandstone. The shale has receded significantly, leaving the sandstone layers with space between them.

5 0
3 years ago
Un casquillo de cobre de 8 kilogramos tiene que calentarse de 25 a 140 grados Celsius con el fin de expandirlo pata que se ajust
uranmaximum [27]

Answer:

354200J

Explanation:

Given parameters:

Mass of copper bushing = 8kg

Initial temperature  = 25°C

Final temperature  = 140°C

Unknown:

Quantity of heat required to heat this mass = ?

Solution:

The amount of heat required to heat mass from one temperature to another is given by;

                  H = m c Δt

where m is the mass

          c  is the specific heat

        Δt is the change in temperature

C is a constant and for copper, its value is 385J/kg°C

 Input the parameters;

            H = 8 x 385 x (140 - 25) = 354200J

8 0
4 years ago
you travel 4.0km east, 4.0km north, then 5.0km at 53.1 degrees north of west in a total of 5 hours. What is the magnitude and di
Sergio039 [100]

Answer:

Explanation:

We shall convert all the displacement in vector form .

i and j represents east and north respectively .

D₁ = 4 i

D₂ = 4 j

D₃ = - 5 cos 53.1 i + 5 sin 53.1 j

= -3i + 4 j

Total displacement = D₁ + D₂ + D₃

= 4i + 4 j - 3i + 4 j

= i + 8j

magnitude of displacement = √( 1² + 8² )

= 8.06 km

velocity = 8.06 / 5

= 1.61 km / h

Direction from x axis in anticlockwise direction .

Tanθ =  8 / 1 = 8

θ = 83° north of east .

7 0
4 years ago
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