Question

Question 3. Choose whether each of the following statements is True or False:

a)The pressure at certain depth in water is less than that at the same depth in oil.

b)As you go deeper in a swimming pool, the buoyant force on you changes with depth.

c)The buoyant force on a floating object must be equal to the weight of the object.

d)A ship does not sink in seawater because the density of steel is less than that of seawater.

e)A faster moving fluid exerts less pressure than the slower moving one.

Answer 1

Q.3.

Part A) False; As density of water is greater than oil and we know that pressure at a depth is given by

as

So pressure in water is more than pressure in oil . Provided density of water must be greater than the density of oil.

Part B ) Palse; Buoyant Force is given by

AS Volume of the object and density of water remains same so Buoyant force also remain same.

Part C) False ; The buoyant force on a floating object must be equal to the weight of the the liquid displaced.

Part D) False; A ship does not sink in seawater because it displaces more water than its own weight.

Part E) True from Bernoulli's theorem

as velocity increases Pressure decreases.