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Galina-37 [17]
3 years ago
10

PLEASE HELP ME!!!!!!!

Physics
1 answer:
Anna [14]3 years ago
6 0
The answer is aaaaaaa
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In order to make an electric current flow it is necessary to have
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In order to make an electric current flow it is necessary to have a source of the current or source of free electrons and also the circuit should be a close one or complete. When there is a break in a circuit, no current would flow in the whole system. 
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45. An object with a mass of 25 kg accelerates east at a rate of 7 m/s? What fiet force is acting on the object?
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According to newton's second law of motion F=ma so

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4 years ago
An air conditioner runs 15 minutes each hour on a hot summer day. It is on a 240 volt circuit and uses 21 amps. Rate is $.10/kWh
Helen [10]

Answer:

Approximately \$ 3.02.

Explanation:

Note that the electric rate in this question is in the unit dollar-per-{\rm kWh}, where 1\; {\rm kWh} is the energy to run an appliance of power 1\; {\rm kW} for an hour.

Number of minutes for which the air conditioner is running in that day: 15 \times 24 = 360\; \text{minute}. Apply unit conversion and ensure that this time is measured in hours (same as the unit of the electric rate.)

\begin{aligned} \text{time} &= 360\; \text{minute} \times \frac{1\; \text{hour}}{60\; \text{minute}} = 6\; \text{hour} \end{aligned}.

The power of this air conditioner is:

\begin{aligned} \text{power} &= \text{voltage} \times \text{current} \\ &= 240\; {\rm V} \times 21\; {\rm A} \\ &= 5040\; {\rm W} \\ &= 5.04\; {\rm kW} \end{aligned}.

Thus, the energy that this air conditioner would consume would be:

\begin{aligned}\text{energy} &= \text{power} \times \text{time} \\ &= 5.04\; {\rm kW} \times 6\; \text{hour} \\ &= 30.24\; {\rm kWh} \end{aligned}.

At a rate of 0.1 dollar-per-{\rm kWh}, the cost of that much energy would be approximately 3.02 dollars (rounded to the nearest cent.)

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2 years ago
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Not be dumbx;()(;45hi
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