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2 years ago

Calculate the energy used by a radio of power 30W in 1 minute.

Physics

2 answers:

Paul [167]2 years ago

7 0

Answer:

1800 joule (1.8kJ)

Explanation:

Formula:

Power = Work / Time

30 = Work / 60

Work = 1800 joule

Work = 1.8kJ

Energy = Work done = 1.8kJ

Hence, Energy used is 1.8kJ.

Alekssandra [29.7K]2 years ago

5 0

Answer:

1.8kJ

Explanation:

Formula :

Energy used = Power x time

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

Given :

⇒ Power = 30 W

⇒ Time = 1 minute = 60 seconds

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

Solving :

⇒ Energy used = 30 W × 60 s

⇒ Energy used = 1,800 J

⇒ Energy used = 1.8kJ

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3 years ago

Which of the following has a negative acceleration?

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3 years ago

Cierto volumen de gas se encuentra a 60°c de temperatura y 5atm de presión, es calentado hasta 140°c, estado en el cual ocupa un

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Answer:

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Explanation:

The system is about a ideal gas. Then you can use the equation for ideal gases for a volume V1, temperature T1 and pressure P1:

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And also for the situation in which the variables T, V and P has changed:

$P_2V_2=nRT_2$ (1)

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For both cases (1) and (2) the number of moles are the same. Next, you solve for n in (1) and (2):

$n=\frac{P_1V_1}{RT_1}\\\\n=\frac{P_2V_2}{RT_2}$

Next, you equal these equations an solve for T2:

$\frac{P_1V_1}{RT_1}=\frac{P_2V_2}{RT_2}\\\\V_1=\frac{P_2V_2T_1}{P_1T_2}$

Finally you replace the values of P2, V2, T1 and T2:

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Hence, the initial volume of the gas is 2221.33 L

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