The elevator has constant acceleration upward
Given that a student that weighs 436 N is standing on a scale in an elevator and notices that the scale reads 498 N.
The formula of force can be derived from the Newton's second law of motion, which states that the force exerted by any object equals mass times the acceleration of that object i.e., F = ma
Net force = mg + ma
498 = 436 + ma
62 = 436 a/ 9.8
a = (62 x 9.8) / 436
a = 1.39 m/s²
Hence, it is clear that the elevator has constant acceleration upward.
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If the distance between two charges is halved, the electrical force between them increases by a factor 4.
In fact, the magnitude of the electric force between two charges is given by:
where
k is the Coulomb's constant
q1 and q2 are the two charges
r is the separation between the two charges
We see that the magnitude of the force F is inversely proportional to the square of the distance r. Therefore, if the radius is halved:
the magnitude of the force changes as follows:
so, the force increases by a factor 4.
The speed would vary depending on where the molecules are found. Molecules in<span> gas will move faster than they would in liquid.Hope this helps!!</span>