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Katyanochek1 [597]
2 years ago
13

How much energy is transferred electrically by a 2000 W cooker in half an hour?

Physics
2 answers:
Kryger [21]2 years ago
5 0

Responder:

E = 1440 kJ

Explicación:

Se da que,

La potencia de un horno de cocción es de 800 W

El voltaje al que se opera es de 230 V

Tiempo, t = 30 minutos = 1800 segundos

Necesitamos encontrar la energía eléctrica utilizada por el horno de cocción. El producto de la potencia y el tiempo es igual a la energía consumida. Entonces,

katovenus [111]2 years ago
5 0
It's not transferred, it's consumed (converted into heat).
If the cooker is full on (all the plates at full), then 1kWh. Else it depends on the duty cycle. If a device is rated 2000W, that's the most it can consume, not what it will actually consume in normal use.
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Explanation:

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sign of exponent: 0

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c)-1/64= -.000001×2^0= -0.1×2^{-5}

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5 0
3 years ago
A block is held at rest against a wall by a force of magnitude F exerted at an angle theta from the horizontal, as shown in the
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Answers:

B.) F cos\theta=F_{n}

C.) F sin\theta=F_{g} \pm F_{f}

Explanation:

The image attached shows the way the force F is acting on the block. Now, if we draw a free body diagram of the situation and write the equations for the Net Force in X and Y, we will have the following:

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Where:

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\theta is the angle

Net Force in Y:

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F_{f} is the Friction force (it is expresed with the \pm sign because this force may be up or down, we cannot know because the block is at rest)

F_{g} is the gravity force

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Rewritting (2):

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An electron, moving south, enters a magnetic field of certain strength. Because of this field the electron curves upward. What i
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Answer: The magnetic field points to the west.

Explanation:

If we take the plane as:

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We have that the electron is moving south, so the velocity of the electron can be written in vector form as:

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Now, when the electron interacts with the magnetic field, the electron moves upwards.

We know that the interaction between an electron and a magnetic field is:

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So we have that this force acts on the z-direction.

Now, to solve this we can use the righ hand rule.

First, we point wit our hand to the direction of the velocity (negative y-axis) now, we want that our thumb points up (the direction of the force) so the side where our palm faces is the direction of the field B.

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then we have that b must be equal to zero, and that:

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a = -(f/q*v)

then the vector of the magnetic field is:

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