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elena-14-01-66 [18.8K]
3 years ago
7

Grinding quartz crystals down to produce sand is an example of a a. change of state. c. chemical reaction. b. chemical change. d

. physical change.
Physics
1 answer:
seraphim [82]3 years ago
5 0
D. A physical change

The makeup of it is still the same it's just ground up
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The percentage error in calculated value of the refractive index of acrylic block is calculated using the formula: (true value - calculated value/true value) × 100%.

<h3>What is refractive index of a refracting medium?</h3>

The refractive index of a medium is the ratio of the sine of the angle of incidence on the medium and the sine of the angle of refraction.

  • Refractive index = sin i/sin r

where;

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The refractive index of a medium increases with density of the medium.

To determine the percentage error in determining the refractive index of a medium, the following formula is used:

  • Percent error = error/true value × 100%

Therefore, the percentage error in calculated value of the refractive index of acrylic block is the ratio of the error and true value multiplied by 100%.

Learn more about refractive index at: brainly.com/question/83184

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Thus, GPE = 1900kg x 9.8m/s^2 x 510m

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Thus, the gravitational potential energy of the airplane is 9496200 joules

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