Anegative change in entropy indicates . the products have a greater number of available energy microstates than the reactants. b. the products have a smaller number of available energy microstates than the reactants

B. the products have a smaller number of available energy microstates than the reactants

Explanation:

Entropy is a thermodynamic quantity defined as a criterion to predict the transformation of thermodynamic systems.

In other words: Entropy is the measure of the disorder (or randomness) of a system and is a function of state. That is, it depends only on the state of the system.  

However, as there is chaos that threatens to destroy a system, there are also self-regulation mechanisms, which allow the level of disorder to drop or remain balanced, so that the existence of the system remains; this is known as negative entropy.

To undersand it better:

In the specific case of a reaction, its variation in entropy is matematically expressed as:

(1)

Where:

is the entropy of the products of the reaction

is the entropy of the reactants of the reaction

Now, remembering entropy is a function of the state of the system, if  have a greater amount of available energy microstates than , the variation in entropy of the system will be negative.

weight of the box is given as

here this is placed on the inclined of angle 42 degree

now this weight will have two components one is along the incline other is perpendicular to it

so here we need to apply a force parallel to incline opposite to its component of weight

so here the component of weight is given as

here we have

so it requires 75 n force to move it upwards

float.

archimedes' principle

denser than water sinks in water.

denser than mercury would sink in it