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BlackZzzverrR [31]
3 years ago
9

Describe streak and cleavage and explain how they can be used to identify a mineral. PLEASE HELP.

Physics
2 answers:
timofeeve [1]3 years ago
5 0
Streak means continuously
Alex787 [66]3 years ago
3 0
STREAK: The streak (also called "powder color") of a mineral is the color of the powder produced when it is dragged across an un-weathered surface.

CLEAVAGE: Cleavage refers to how some minerals break along flat planes when exposed to stress, such as being hit with a hammer.

How is streak important to identifying a mineral?-

The color of a mineral's powder is often a very important property for identifying the mineral. The streak test is done by scraping a specimen of the mineral across a piece of unglazed porcelain known as a "streak plate." This can produce a small amount of powdered mineral on the surface of the plate.

How is cleavage important to identifying a mineral?-

Cleavages are described in terms of their quality - how smoothly the mineral breaks - and their difficulty - how easy, or how hard, it is to produce the cleavage. The quality of cleavages are perfect, imperfect, distinct, good, fair, and poor. The difficulty is described as easy, hard, and difficult to produce. So, cleavage can be used to identify minerals on the Mohs’ hardness scale.
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Answer:

The permittivity of rubber is  \epsilon  = 8.703 *10^{-11}

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From the question we are told that

     The  magnitude of the point charge is  q_1 =  70 \ nC  =  70 *10^{-9} \  C

      The diameter of the rubber shell is  d = 32 \ cm  =  0.32 \ m

       The Electric field inside the rubber shell is  E =  2500 \ N/ C

The radius of the rubber is  mathematically evaluated as

              r =  \frac{d}{2} =  \frac{0.32}{2}  =  0.16 \ m

Generally the electric field for a point  is in an insulator(rubber) is mathematically represented as

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    =>     E  *  \epsilon  *  4 * \pi *  r^2 =  Q

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substituting values

            \epsilon  =  \frac{70 *10^{-9}}{2500 *  4 *  3.142 *  (0.16)^2}

            \epsilon  = 8.703 *10^{-11}

7 0
3 years ago
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