Question

A Ping-Pong ball is held submerged in a bucket of water by a string attached to the bucket's bottom.Salt is now added to the water in the bucket, increasing the density of the liquid. What happens to the tension in the string ?The tension does not change.The tension increases.The tension decreases.What happens to the tension in the string if the Ping-Pong ball is replaced by a smaller spherical object of equal weight?What happens to the tension in the string if the Ping-Pong ball is replaced by a smaller spherical object of equal weight?The tension does not change.The tension increases.The tension decreases.Salt is now added to the water in the bucket, increasing the density of the liquid. What happens to the tension in the string ?

Answer 1

1) tension increases, 2) Tension Decreases

Step-by-step explanation:

In this exercise we propose the solution of it, for this we use the principle and Archimedes where it defines the thrust as the weight of the liquid dislodged by a body

B = m g

Let's use the definition of density

ρ = m / V

B = ρ V g

We use Newton's second law for balance

B - W –T = 0

T = B –W

T = ρ V g - mg

Case 1. We increase the density of the fluid.

In this case, unless the thrust increases, therefore the tension also increases

Case 2. The body is exchanged for another of equal weight, but smaller volume.

In this case if the volume of the body decreases, the volume of the dislodged liquid decreases, so the Tension Decreases