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Answer:
- <em><u>Passive solar energy</u></em>
Explanation:
First of all, you must know that you if you put an egg on a sidewalk you are dealing with energy from the Sun, i.e. solar energy, while geothermal energy is energy that comes from the inner of the Earth and biomass energy comes from plant or animal material.
The term passive solar energy refers to the fact that the energy of the sun is used directly for the intended task, which in this case is to cook the egg.
The term active solar energy refers to the fact that the energy of the Sun is converted into a different form of energy and then used for your purpose. For instance, if the energy of the Sun were used to produce electricity and then this electricity used to cook the egg, you would be using an acitve solar energy.
Answer:
what is that I've never seen that problem like that
Answer: Rougher surfaces have more friction between them than smoother surfaces. That's why we put sand on icy sidewalks and roads. You can't slide as far across ice with shoes as you can on the blades of skates. The rougher surface of the soles of the shoes causes more friction and slows you down.<em> There are four types of friction: static, sliding, rolling, and fluid friction. Static, sliding, and rolling friction occur between solid surfaces. Static friction is strongest, followed by sliding friction, and then rolling friction, which is weakest.</em>
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Answer:
1.48 × 10²⁵ Ions
Solution:
Calcium Nitrate having a chemical formula Ca(NO₃)₂ is made up of one Ca²⁺ cation and two NO₃⁻ anions. Hence, we can say that each Calcium Nitrate contains three ions respectively.
Therefore,
1 mole of Ca(NO₃)₂ contains = 6.022 × 10²³ formula Units
So,
8.2 mole of Ca(NO₃)₂ will contain = X Formula Units
Solving for X,
X = (8.2 mol × 6.022 × 10²³ formula units) ÷ 1 mol
X = 4.93 × 10²⁴ Formula Units
As discussed,
1 Formula Unit of Ca(NO₃)₂ contains = 3 Ions
So,
4.93 × 10²⁴ Formula units will contain = X ions
Solving for X,
X = (4.93 × 10²⁴ Formula Unit × 3 Ions) ÷ 1 Formula Unit
X = 1.48 × 10²⁵ Ions