Question

(1) Calculate the buoyant force on a 2.00-L helium balloon.

(2) Given the mass of the rubber in the balloon is 1.50 g, what is the net vertical force on the balloon if it is let go?

Answer 1

(1) 0.024 N

(2) 0.0093 N

Step-by-step explanation:

When a body is immersed in a fluid partly of wholly it experience an upward force called buoyant force.

This buoyant force depends on the volume of the body, density of fluid and gravity.

(1) Volume = 2 L = 0.002 m^3

density of air, d = 1.23 kg/m^3

g = 9.8 m/s^2

The buoyant force is

F = V d g

F = 0.002 x 1.23 x 9.8 = 0.024 N

(2) mass, m = 1.5 g

The net vertical force is

F = F - m g

F = 0.024 - 0.0015 x 9.8 = 0.0093 N