(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?

(1) 0.024 N

(2) 0.0093 N

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

another example of kinetic energy would be,

kinetic energy   >     moving energy

answer   >   letter choice (c),   a hammer falling off a table.

hope that !                                         : )