Question: as a hot air balloon rises in the air what...
As a hot air balloon rises in the air, what happens to the buoyant force acting on the balloon?
The buoyant force decreases.
The buoyant force initially increases then decreases.
The buoyant force increases.
The buoyant force remains constant.
A truck with an open top container half full of water is accelerating up an inclined plane. The free surface of the water will _____________________. Hint: draw a basic sketch to help you visualise the water in the container.
none of the other answers
make an angle in the direction of the inclined plane
make an angle in the opposite direction to that of the inclined plane