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DanielleElmas [232]
3 years ago
6

Which of the following descriptions explains the process of water freezing? A) Water molecules speed up until they escape into a

different phase. B) Water molecules slow down until they begin to bond together C) Water molecules are squeezed together by high pressure until they begin to stick to one another. D) As water molecules cool, their shape changes from rounded to irregular, making them more likely to link to one another.
Physics
2 answers:
scZoUnD [109]3 years ago
8 0

Answer:

B

Explanation:

egoroff_w [7]3 years ago
7 0

Answer: B. Water molecules slow down until they begin to bond together

Explanation:                                                                                                                                  When the water is to be cooled, the molecules start to slow down and becomes no longer energetic which means that they are going to bond together.

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Suppose that the time to failure (in hours) of fans in a personal computer can be modeled by an exponential distribution with λ
Reptile [31]

Answer:

1. 0.0498

2. 0.8775

Explanation:

Let X represent the time of failures (in hours) of PC fans

From the question, X is exponentially distributed with the parameter λ = 0.0003

Also, it's to be noted that X is a continuous random variable

The probability distribution function of X is f(x) = λe^-(λx) for x >= 0

To solve this, we need to get the CDF (cumulative distribution function) of the above PDF

CDF

The CDF is simply the integration (integral calculus) of the PDF

Let F(x) represent the CDF

1. What proportion of the fans will last at least 10,000 hours

F(x) = 1 - e^-(λx) for x>=0

For x = at least 10000 hours and λ = 0.0003 -------- The keyword here is at least

Because P(True) + P(False) = 1 ----------- (Probability of true + Probability of false = 1),

We have

F(x>= 10000) = 1 - F(x<= 10000) -------- Notice the change in the inequality sign

This then equates to

F(x>=10000) = 1 - (1 - e^-(λx)) ---------- Open the bracket

F(x>=10000) = 1 - 1 + e^-(λx)

F(x>=10000) = e^-(λx)

F(x>=10000) = e^-(0.0003 * 10000)

F(x>=10000) = e^-(3)

F(x>=10000) = 0.049787068367863

F(x>=10000) = 0.0498 ---------- Approximated

2. What is the proportion of the fans will last at most 7000 hours

X = at most 7000 and λ = 0.0003

The keyword here is at most, so we make use of

F(x) = 1 - e^-(λx) for x>=0

F(x<=7000) = 1 - e^-(λx)

F(x<=7000) = 1 - e^-(0.0003 * 7000)

F(x<=7000) = 1 - e^-(2.1)

F(x<=7000) = 1 - 0.122456428252981

F(x<=7000) = 0.877543571747018

F(x<=7000) = 0.8775 ---------- Approximated

5 0
4 years ago
A DC current of 60 mA can cause paralysis of the body's respiratory muscles and hence interfere with breathing, but only 15 mA (
Liula [17]

To solve this problem it is necessary to apply the concepts related to Ohm's Law to find the voltage in the case of direct current. While for the Alternate current we use the concept of RMS voltage.

PART A) In the case of DC we have to,

V=IR

Where,

I = Current

R = Resistance

Where the current is 60mA y the resistance is 1000\Omega , then the potential would be

V=(60mA)(1100\Omega)

V = 66V

In the case of DC we have that the current and the RMS voltage is,

I_{rms} = 15 mA

R = 1100 \Omega

V_{rms} = 16.5 V

The potential in AC then is,

V_o = \sqrt{2}V_{rms}

V_o = \sqrt{2}(16.5)

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3 0
3 years ago
An object is suspended from the ceiling with two wires that make an angle of 40° with the ceiling. The weight of the body is 150
MaRussiya [10]
Refer to the diagram shown below.

Let T =  the tension in each wire.
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2T cos(50°) = 150 N
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Answer: 117 N

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3 years ago
Your lab team is working with a chemical in lab. You need 1.1 grams of the liquid chemical for a reaction, and you know its dens
saveliy_v [14]
The answer is 0.69mL. We based the formula from the formula of density

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4 years ago
A battery that runs a moving toy
slava [35]

Chemical to Electrical

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