a few science questions. PLEASE HELP!!?

1. if you drop a block of plastic into a tub of water, what happens to the block if the buoyant force on the block is greater than the weight of the block? explain.

2. a small metal bar with dimensions of 5cm x 2cm x 2cm is placed into a tub of water and sinks. what volume of water does the metal bar displace?

3. a ball with a density of 15g/cmcubed is placed in a fluid with a density of 21g/cmcubed. explain in detail what happens to the ball and why. be sure to discuss buoyancy in your answer.

4. why does the air above a parking lot on a sunny day rises. use the terms buoyancy and density in your answer.

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