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Questions in physics

[Open]Why do warm air and water rise?

[Open]A rock is dropped into a well and hits the water in 5 seconds. If there is no air resistance, what would be the rock's final speed?

[Open]Where is your potential energy greatest when you are swinging on a playground swing?

[Open]A 2.5 kg table can hold a certain amount of weight. What is its structural efficiency?

[Open]What is the value of free-fall acceleration?

[Open]The copper wire and bulb are connected in series with a 220 V electric supply. Why does only the electric bulb glow while the copper wire remains unchanged? Provide a reason to support your answer.

[Open]Which of the following drives the movement of convection currents? A. Pressure differences B. Density differences C. Volume differences

[Open]Which of the following is a major disadvantage of nuclear power? A. High air pollution B. Toxic waste materials C. We lack the technology to use it widely

[Open]Which of the following is an example of kinetic energy? A. A can of paint sitting at the top of a ladder B. A dog running down the street C. A bird perched on a wire D. A person taking a nap

[Open]An anchored fishing boat used sonar to work out how deep the sea is. It sends out a Ping of sound and detects the echo 2 seconds later How deep is the water??