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3 years ago

According to the second law of thermodynamics, when energy changes occur, _______ increases. question 2 options:

1 answer:

7 0

The correct answer is entropy.

In fact, second law of thermodynamics states that the total entropy of an isolated system can never decrease. It can remain constant if the system is in equilibrium or in case of a reversible process: however, perfectly reversible process do not exist in the real world, so the entropy of a system always increases whenever there is a process that involves energy changes.

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Suppose certain coins have weights that are normally distributed with a mean of 5.805 g5.805 g and a standard deviation of 0.071

stiks02 [169]

Answer:

a) $P(5.675$

And the expected number would be 260*0.933=242.58 and n =243 rounded up.

b) $P(5.675< \bar X$

Explanation:

1) Previous concepts

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

The Z-score is "a numerical measurement used in statistics of a value's relationship to the mean (average) of a group of values, measured in terms of standard deviations from the mean".

The central limit theorem states that "if we have a population with mean μ and standard deviation σ and take sufficiently large random samples from the population with replacement, then the distribution of the sample means will be approximately normally distributed. This will hold true regardless of whether the source population is normal or skewed, provided the sample size is sufficiently large".

2) Part a

Let X the random variable that represent the weights of a population, and for this case we know the distribution for X is given by:

$X \sim N(5.805,0.71)$

Where $\mu=5.805$ and $\sigma=0.071$

We are interested on this probability

$P(5.675$

And the best way to solve this problem is using the normal standard distribution and the z score given by:

$z=\frac{x-\mu}{\sigma}$

If we apply this formula to our probability we got this:

$P(5.675$

And we can find this probability on this way:

$P(-1.83$

And the expected number would be 260*0.933=242.58 and n =243 rounded up.

3) Part b

If 260 different coins are inserted in the vending machine, what is the probability that the mean falls between the limits of 5.675 g and 5.935.

From the central limit theorem we know that the distribution for the sample mean $\bar X$ is given by:

$\bar X \sim N(\mu, \frac{\sigma}{\sqrt{n}})$

$P(5.675< \bar X$

8 0

4 years ago

Distant galaxies appear to be much larger than those nearby. true or false

jonny [76]

Answer:True

Explanation: Distant galaxies appear to be larger than those close by because of cosmic expansion. light from nearer galaxies travel farther and makes the other to be billions of years away. The farther it takes to get to another galaxy, the bigger it appears

3 0

3 years ago

Which of the following statements is

ladessa [460]

I’m pretty sure it’s B

B: If an object has mass, it has gravity.

8 0

3 years ago

Read 2 more answers

Pls help will mark brain

Gemiola [76]

Answer: D

Explanation:

5 0

3 years ago

A Explain why the sound produced by the horn of an approaching car

aleksklad [387]

When a car approaches you, the sound waves that reach you have a shorter wavelength and a higher frequency. You hear a sound with a higher pitch. When the car moves away from you, the sound waves that reach you have a longer wavelength and lower frequency.

?? ⬇️

An approaching source moves closer during period of the sound wave so the effective wavelength is shortened, giving a higher pitch since the velocity of the wave is unchanged. Similarly the pitch of a receding sound source will be lowered.

The Doppler effect is an effect observed in light and sound waves as they move toward or away from an observer. One simple example of the Doppler effect is the sound of an automobile horn. Picture a person standing on a street corner. A car approaches, blowing its horn.

Comparing two waves of the same wavelength, a higher frequency is associated with faster movement. Comparing two waves of different wavelengths, a higher frequency doesn't always indicate faster movement, although it can. Waves of different wavelengths can have the same frequency.

The pitch of a sound is our ear's response to the frequency of sound. Whereas loudness depends on the energy of the wave. ... The pitch of a sound depends on the frequency while loudness of a sound depends on the amplitude of sound waves.

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3 years ago