# Archimedes' Principle and a weather balloon

• a129
In summary, the conversation discusses the concept of buoyant force and its relationship to the weight of an object in a fluid. It also mentions a scenario where the upward force and weight are balanced, resulting in floating. The question involves choosing an incorrect answer based on the weight of a meteorological instrument.
a129

## Homework Statement

2. Homework Equations

Buoyant force= mg(mass of fluid displaced = Vpg (volume of fluid displaced)
Buoyant force=weight of object (if floating)

## The Attempt at a Solution

If the total mass is 99kg, then the total force acting downwards is 990N. It also said that the balloon "stops to move upwards after reaching a certain altitude" and from there I just assumed that it is floating, so upward force and weight are balanced.

My answer is D, but I'm not sure if it's correct because why did they give the weight of meteorological instrument?

a129 said:
why did they give the weight of meteorological instrument?
To give you the opportunity of choosing an incorrect answer.

a129

## What is Archimedes' Principle?

Archimedes' Principle states that the upward buoyant force exerted on an object immersed in a fluid is equal to the weight of the fluid that the object displaces.

## How does Archimedes' Principle apply to weather balloons?

In the case of a weather balloon, the volume of air displaced by the balloon is equal to the volume of the balloon itself. This means that the buoyant force acting on the balloon is equal to the weight of the displaced air, allowing the balloon to float in the atmosphere.

## What factors affect the buoyant force on a weather balloon?

The buoyant force on a weather balloon is affected by the volume of the balloon, the density of the surrounding air, and the weight of the balloon and its contents.

## Why do weather balloons rise in the atmosphere?

Weather balloons rise in the atmosphere due to the buoyant force being greater than the weight of the balloon and its contents. As the balloon rises, the air becomes less dense, causing the buoyant force to decrease and eventually equalize with the weight, resulting in the balloon reaching a stable altitude.

## What is the purpose of using weather balloons?

Weather balloons are used to collect data about the atmosphere, including temperature, humidity, pressure, and wind speed and direction. This information is important for weather forecasting and studying weather patterns.

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