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Olin [163]
3 years ago
14

Which mineral has a metallic luster, does not react with hydrochloric acid, and has a hardness of 6?

Physics
1 answer:
Nezavi [6.7K]3 years ago
7 0

Answer:

The Answer is C

Explanation:

I took the test

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Why do solid have fixed shape?
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Any matter that is a solid has a definiteshape and a definite volume. The molecules in a solid are in fixedpositions and are close together. Although the molecules can still vibrate, they cannot move from one part of the solid to another part. As a result, a solid does not easily change its shape or its volume.
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3 years ago
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A rock is thrown upwards and has a max altitude of 40 m. What was its initial velocity?
Natali [406]

Recall the formula,

{v_f}^2-{v_i}^2=2a\Delta x

where v_i and v_f are the rock's initial and final velocities, respectively; a is its acceleration; and \Delta x is the displacement it undergoes.

At any point during its motion, the rock is subject to gravity, so a=-g, where g=9.80\frac{\rm m}{\mathrm s^2}. At its maximum height, the rock has zero vertical velocity, and if we take its starting height to be the origin, we have \Delta x=x_{\rm max}.

So,

0^2-{v_i}^2=-2gx_{\rm max}\implies-{v_i}^2=-2\left(9.80\dfrac{\rm m}{\mathrm s^2}\right)(40\,\mathrm m\implies\boxed{v_i=28\dfrac{\rm m}{\rm s}}

5 0
3 years ago
PLZ HELP ME ASAP ON THE QUIZ RIGHT NOW....WILL GIVE BRAINILEST:D
Orlov [11]

Answer:

b i took the test like a week ago trust me

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____ have more energy than ____. A. Radio waves; microwaves B. Ultraviolet rays; X-Rays C. Gamma rays; infrared rays D. Radio wa
Aloiza [94]
C. Gamma rays have more energy than infrared rays
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3 years ago
What are the different types of Energy transformations and Energy Transfers?
Harman [31]

Explanation:

Here are some of the ways that energy can change (transform) from one type to another:

The Sun transforms nuclear energy into heat and light energy.

Our bodies convert chemical energy in our food into mechanical energy for us to move.

An electric fan transforms electrical energy into kinetic energy.

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