Solve the helium balloon puzzle. A helium balloon is tied with a string to the floor of a car. The windows of the car are closed. When I start the car and accelerate, in which direction will the balloon go?
Backward? Forward? Or will it stay put?
Solution
The Helium balloon will also move forward as the car accelerates.
When the car is stationary, the air inside the car is at rest wrt to its surrounding.
The Helium inside the Helium Balloon is also at rest wrt air
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