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3 years ago

6

Which type of hazard results in water pollution? A) Biological hazard B) Chemical hazard C) Physical hazard D) Environmental haz

ard

2 answers:

Eduardwww [97]3 years ago

7 0

Answer:

(a). biological pollution

makvit [3.9K]3 years ago

7 0

Answer:

B.

Explanation:

Chemicals are the most common water contaminants. They effect both surface and underground water bodies.

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Which of the following would NOT have to be cleaned after each use?

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Answer:

OD.

nail brush

Explanation:

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3 years ago

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On a piece of paper, sketch the x-y stress state and the properly oriented principal stress state. Use the resulting sketch to a

stealth61 [152]

Answer:

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Explanation:

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4 years ago

What are the equipment requirements for windshields and side windows?

lorasvet [3.4K]

Answer:

1.) Safety Glass

-these safety glasses should not be covered with reflective or non-transparent material, and, free of any stickers not required by law.

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3 years ago

A mercury thermometer has a cylindrical capillary tube with an internal diameter of 0.2 mm. If the volume of the thermometer and

vova2212 [387]

To solve this problem we will proceed to calculate the specific volume from the area of the cylinder and the sensitivity. Later we will calculate the volumetric coefficient of thermal expansion and finally we will be able to calculate the volume through the relation of the two terms mentioned above. Our values are

$\text{Sensitivity}= 2mm/\°C$

$\text{Internal diameter } d= 0.2mm$

$\text{Differential expansion of Hg } \lambda_L = 1.82*10^{-4}/\°C$

Let's start by calculating the specific volume which is given by

$v = \pi (\frac{d}{2})^2 \gamma$

Here,

d = Diameter

$\gamma$ = Sensitivity

Replacing our values we have

$v = (\frac{\pi}{4})(0.2mm)^2(2mm/\°C)$

$v = 0.0628mm^3 /\°C$

Now we will obtain the value of the volumetric coefficient of thermal expansion of mercury through the differential expansion coefficient of Hg whic is three times, then

$\lambda_V = 3\lambda_L$

$\lambda_V = 3(1.82*10^{-4}/\°C)$

$\lambda_V = 5.46*10^{-4}/\°C$

Finally the relation to calculate the volume the bulb must is

$\text{Specific volume} = \text{Bulb Volume} \times \text{Volumetric Coefficient}$

$v = v_B \times \lambda_V$

$v_B = \frac{v}{\lambda_V}$

$v_B = \frac{0.0628mm^3/\°C}{5.46*10^{-4}/\°C}$

$v_B = 115mm^3$

Therefore the volume that the bulb must have is $115mm^3$

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3 years ago

A rectangular region ABCD is to be built inside a semicircle of radius 10 m with points A and B on the line for the diameter and

Talja [164]

Answer:A rectangular region ABCD is to be built inside a semicircle of radius 10 m with points A and B on the line for the diameter and points C and D on the semicircle with CD parallel to AB. The objective is to find the height h * that maximizes the area of ABCD.

Formulate the optimization problem.

Explanation:A rectangular region ABCD is to be built inside a semicircle of radius 10 m with points A and B on the line for the diameter and points C and D on the semicircle with CD parallel to AB. The objective is to find the height h * that maximizes the area of ABCD.

Formulate the optimization problem.

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3 years ago