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3 years ago

5

If a storm is 7.5 kilometers away, how much time is expected between observations of lightning and thunder? Round your answer to

one decimal place. seconds

1 answer:

Genrish500 [490]3 years ago

3 0

Answer:

22.7 seconds

Explanation:

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I think it's the first one

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The image shows Earth’s orbit around the Sun.

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The speed increases from X to W because a component of the gravitational force acts in the direction of the velocity.

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A sample of 2 moles of an ideal diatomic gas experiences a temperature increase of 60 K at constant volume. (a) Find the increas

il63 [147K]

Answer:

A. To find increase in internal energy

We use

CV= f/2* R

=20.77J/molK

So change in internal energy is

nCvdt

So substituting

= 2 x 20.77x 60K

= 2493J

B.

We know that molar specific heat increase by R/2

So CV= (f/2+1)R

Which is 29.1J/milk

So

Increase in internal energy will be

nCvdt

= 2* 29.1*60

= 3490.2J

C. the translational energy is 3/2R

And the total molar specific heat capacity is 7/2R

So the fraction of energy in b due to K.E will be

3/7 * 3490.2

=1495.8J

5 0

3 years ago

How will a current change if the voltage in a circuit is held constant while the resistance doubles?

VARVARA [1.3K]

<h2>Answer:</h2>

The current will drop to half of its original value.

<h2>Explanation:</h2>

To solve this problem, we must use Ohm's law that states that in a circuit the voltage $v$ across a resistor is directly proportional to the current that flows through that circuit. In other words:

$v \propto Ri \\ \\ or: \\ \\ v=Ri \\ \\ It's \ also \ valid: i=\frac{v}{R}$

According to our problem, if the voltage in the circuit is held constant while the resistance double, that is $R_{New}=2R \ and \ v_{New}=v$ . So:

$v=R_{New}i_{New} \\ \\ v=2Ri_{New} \\ \\ Isolating \ i_{New}: \\ \\ i_{New}=\frac{v}{2R} \therefore i_{New}=\frac{1}{2}\frac{v}{R} \therefore i_{New}=\frac{1}{2}i$

In conclusion, <em>the current will drop to half of its original value.</em>

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3 years ago

What is the correct calculation for resistance when the current is 4 amps and the voltage is 24 volts?

Andre45 [30]

Answer:

24 volts ÷ 4 amps = 6 ohms

Explanation:

We know that the Ohm's law has given the relationship between the current, voltage and the resistance of the wire. Mathematically, it can be written as :

$V=I\times R$

Where

I is the current

R is the resistance

If current flowing is 4 amps and voltage is 24 volts. The formula to find the resistance will be :

$R=\dfrac{V}{I}$

$R=\dfrac{24\ Volts}{4\ A}$

R = 6 Ohms

Hence, the correct option is (d) " 24 volts ÷ 4 amps = 6 ohms ".

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3 years ago

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