Fluids (CH4)

Question 1

What is the standard measurement of pressure?

Answer 1

Pascals (Newtons/M²) or Pa

Question 2

What are other measures of pressure?

Answer 2

101325 Pa = 1 atm = 760 mmHg = 760 torr

Question 3

When will an object sink?

Answer 3

When gravitational force is greater than the buoyant force ( es. if the object submerged is denser than the fluid).

Question 4

According to Bernoulli’s equation, how does an airplane lift itself?

Answer 4

1. The slower air below the wings will exert more force on the wing than the faster air above, thereby lifting the plane.
2. The wings are curved so that air must travel farther above the wing.

Equation: ( P₁ + ½pv_i² + pgh_i = P₂ + ½pv_f² + pgh_f )

Question 5

According to the venturi effect, what happens to the pressure above narrow tubes?

Answer 5

Since the linear speed increases at narrow points, the pressure exerted on the walls decreases; so the columns above the tube will be lower in height.