The answer is a dense substance that is hard and incompressible.
A crystal or crystalline solid is a solid material whose constituents (such as atoms, molecules, or ions) are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions.
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Fossil fuels are the largest source of energy in the US.
Answer:

Explanation:
Given:
- change in stiffness constant of the spring on replacing the original springs,

- mass of the car,

- initial length of the original car-spring before compression,

- final length of the original car-spring after compression,

So, weight of the car:



<u>Now the spring constant of original spring:</u>
(since 4 springs are in parallel)


<u>So the stiffness constant of the new springs:</u>



<u>Now the height lowered:</u>
(since 4 springs are in parallel)

B. picking up a box off the floor
The charge of one electron is 1.6 x 10⁻¹⁹ C
Number of electrons = (50 x 10⁻⁶) / 1.6 x 10⁻¹⁹
= 3.125 x 10¹⁴ electrons