Question

A soap bubble hovers motionlessly in the air. If the soap bubble's mass, including the air inside it, is 1.05 × 10^−4 kg, determine the magnitude of the upward force acting on it.

a) 1.05 × 10^−4 N
b) 9.8 × 10^−4 N
c) 1.05 × 10^−3 N
d) 9.8 N

Answer 1

The magnitude of the upward force acting on the soap bubble is 1.05 × 10^−3 N.

Step-by-step explanation:

The soap bubble hovers motionlessly in the air because the upward force acting on it is equal to the weight of the bubble. To determine the magnitude of this upward force, we need to calculate the weight of the bubble. Weight can be calculated using the equation:

Weight (W) = mass (m) x gravitational acceleration (g)

The mass of the soap bubble, including the air inside it, is given as 1.05 × 10^−4 kg. The gravitational acceleration on Earth is approximately 9.8 m/s². Therefore, the magnitude of the upward force acting on the soap bubble is:

Upward force = Weight = 1.05 × 10^−4 kg x 9.8 m/s² = 1.05 × 10^−3 N