A pool with a solar cover will absorb the heat faster during the day and when left on the pool over night it will prevent the loss of heat.
Concrete because the sand would burn it.
Less resistance/friction on concrete.
Less resistance/friction on concrete.
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Less resistance on a smooth concrete road.
On dirt because concrete hurts there belly
During movement water is faster than sand and during cooling sand is faster than water.
Yes, Portland cement concrete pavement is often more economical in the long term than is asphalt concrete pavement. The asphalt concrete can be quite a bit faster to lay down and open to traffic, though.
A glass of water evaporate faster without a lid.
If the cart is rolling downhill it will roll faster with mass, but on level ground or uphill it will roll faster without mass.
An electric drill allows you to drill a hole anywhere faster than by hand. Drilling holes in walls is easy, but you need different bits for wood and board walls or concrete walls or brick walls.