A pupil wants to find the maximum gravitational potential energy (GPE) gained by a football after he kicks it. Describe what measurements he needs to make and how he could calculate the maximum GPE.​

A100-watt light bulb illuminates a solar cell. the electricity from the solar cell operates a water pump that delivers 1 watt of power. what is the efficiency of the system?

Why is rain likely when warm, moisture-laden air meets cold air? a) the lighter warm air will rise and cool down, causing condensation and rain. b) the cold air moves faster and pushes the warm air away, causing condensation and rain. c) the moisture in the warm air condenses on contact with the cold air, causing rain to fall. d) the cold air mixes with the warm air, reducing its temperature causing moisture to condense.

Explain the difference in reactivity of the elements based on their electron configurations.