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3 years ago

13

Irradiated PVC insulated jacket can withstand a maximum temperature of?

2 answers:

horsena [70]3 years ago

4 0

The maximum temperature that a PVC can withstand is 130° C. Beyond this the PVC will melt. From the choices given the correct answer is option D. 130° C.

Kryger [21]3 years ago

3 0

Irradiated PVC or also known as the polyvinyl chloride is extensively used in electrical and electronic equipment. This substance has an extensive or exceptional resistance to temperature. From reliable sources, there range at which PVC may operate at -55 to 105°C. Nearest value would be 125°C. Thus, the answer would be letter A.

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A new element (solid at room temperature) is discovered that has:

gtnhenbr [62]

Answer:

A metalloid is a substance that has both the qualities of a metal and a non metal. Metals conduct electricity and have a high melting point.The element described does not conduct electricity until temperatures are reduced therefore it is not a metal. The fact that conduction occurs when temperatures are reduced means that it is not a non metal because non metals do not conduct electricity at all. Therefore the element is a metaloid because it exhibits some properties of a metal and others of a non mental.

Explanation:

5 0

2 years ago

The half-life of radon-222 is 3.8 days. If a sample currently contains 3.1 grams of radon-222, how much radon-222 did this sampl

vodka [1.7K]

The number of grams of radon 222 did it have 15.2 ago was 49.6 grams( answer C)

<u>calculation</u>

calculate the number of half life it has covered from 15.2 days to 3.8 days

that is divide 15.2/ 3.8 = 4 half life

half life is time taken for a radio activity of a specified isotope to fall to half its original mass

therefore 3.8 days ago it was 3.1 x2 = 6.2 grams

7.6 days ago it was 6.2 x2 = 12.4 grams

11.4 days ago it was 12.4 x2= 24.8 grams

15.2 days ago it was 24.8 x2=49.6 grams

5 0

3 years ago

Explain some of the benefits and problem associated with the pesticide DDT.

Dafna1 [17]

Some benefits are that DDT helps us grow crops and keeps pests off our crops.

But DDT is harmful to the environment. If it gets into the water ways then if can harm fish and animals that eat the fish such as birds.

4 0

3 years ago

Rpd pls ii test :)<br><br> tot ce se afla in poza

mamaluj [8]

Answer:

Sorry mate! I can't understand this language...

4 0

3 years ago

A 32.2 g iron rod, initially at 21.9 C, is submerged into an unknown mass of water at 63.5 C. in an insulated container. The fin

lorasvet [3.4K]

Answer : The mass of the water in two significant figures is, $3.0\times 10^1g$

Explanation :

In this case the heat given by the hot body is equal to the heat taken by the cold body.

$q_1=-q_2$

$m_1\times c_1\times (T_f-T_1)=-m_2\times c_2\times (T_f-T_2)$

where,

$c_1$ = specific heat of iron metal = $0.45J/g^oC$

$c_2$ = specific heat of water = $4.18J/g^oC$

$m_1$ = mass of iron metal = 32.3 g

$m_2$ = mass of water = ?

$T_f$ = final temperature of mixture = $59.2^oC$

$T_1$ = initial temperature of iron metal = $21.9^oC$

$T_2$ = initial temperature of water = $63.5^oC$

Now put all the given values in the above formula, we get

$32.3g\times 0.45J/g^oC\times (59.2-21.9)^oC=-m_2\times 4.18J/g^oC\times (59.2-63.5)^oC$

$m_2=30.16g\approx 3.0\times 10^1g$

Therefore, the mass of the water in two significant figures is, $3.0\times 10^1g$

3 0

3 years ago