Answer:
<h2>A. Nearsightedness</h2>
Explanation:
A nearsightedness is an eye defect that occurs when someone is only able to see close ranged object but not far distance object. According to the question, if the length of my eye decreases slightly as I age, this means there is a possibility that I will find it difficult to view a far distance object as I age.
At 70, once my eyes had decreased slightly in length, this means I will only be able to see close ranged object but not far distant object, showing that I am now suffering from nearsightedness according to its definition above.
Answer is: <span>when the solute is molecular, not ionic.
When the solute is ionic, formula contains t</span><span>he </span>van 't Hoff factor: ΔTf = Kf · m · i.
Van 't Hoff (i) is <span>the number of dissolved particles the solute produces and it is usually i = 2,3...
</span>For molecular compounds (most non-<span>electrolytes)</span> van't Hoff factor is equal one.
Answer:
density; thermal
Explanation:
Convection currents occur in fluids because of temperature and density differences. Convection currents transfer thermal energy throughout a fluid.
<em>When a fluid is heated, the molecules closest to the heat source gets heated first and their temperature is raised. The rise in temperature lowers their density and as such, they move to the upper portion of the fluid to be replaced by yet-to-be-heated molecules at the upper portion. </em>
<em>When the replacement molecules also get heated, the same process occurs and a to-and-from rotational movement of molecules, also known as convection current, is created within the fluid. The to and from movement, thus, transfer thermal energy within the fluid until all the molecules within the fluid are at the same temperature.</em>
Answer:
Explanation:
Using Newton's second law:
Where 
is the force applied on the object, 
is the mass of the object, and 
is the acceleration.
In this case we need the acceleration, so we clear for :
we know that the force is: 
, and the mass: 
so the acceleration:
the acceleration of the block is:
