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Explain two ways to find volume of a plastic cube?
1. Measure the length of one of the sides and cube it (ie multiply the length by the length by the length) 2. Get a bowl with enough water to cover the cube; mark the level of the water; submerge the cube in the water and mark the new level of the water. The volume of the cube is the volume between the two marks - this can be measured by removing the cube and using a measuring jug to measure the amount of water that is needed to be added to raise the water from the first mark to the second mark.
Will focal length of concave mirror change when kept in water?
yes
Why the focal length of concave mirror changes in water?
I don't think so. The focal length would remain the same. It mainly depends on the radius of curvature of the mirror.
What is the mass of a million millimeters of water?
The mass is zero. A millimetre is a measure of length and has no volume.
How many gallons of water flows from a garden hose for 1 hour?
Depends on the water pressure, and the diameter and length of the hose. Sorry, but there really is no one answer.
