It is: 10 m
No, it misses the mark by more than a power of 10.
Depends on depth of gravel you plan to put down. For each 1 inch depth: Estimate gravel having a density of 2.7. 150 x 1/12 x 62.4 x 2.7 = 2106 pounds (slightly more than 1 ton) so if you want 3 inches of gravel you need about 3 tons of gravel
A ton is a measure of mass, not of weight. A truck may have a mass of 5-10 tonnes (or more, if it is a very large truck), so gather a few of those, and you have 100 tonnes. Another example would be 100 cubic meters of water (for example, the contents of a rectangular 5x10 swimming-pool, with a depth of 2 meters).
should be slightly more
It really depends on what is known about the cone. If you know the volume (v) then depth = 3*v/(pi*r^2). There is more than one way to measure, if all else fails use a ruler.
10 meters
10 metres is not just a more reasonable estimate, it is the only estimate that anyone but an ignoramus would make.10 metres is not just a more reasonable estimate, it is the only estimate that anyone but an ignoramus would make.10 metres is not just a more reasonable estimate, it is the only estimate that anyone but an ignoramus would make.10 metres is not just a more reasonable estimate, it is the only estimate that anyone but an ignoramus would make.
A more reasonable estimate would be 15.
you are more likely to underestimate its true depth.
It'll be a little more than half. Estimate 87.
It'll be a little more than half. Estimate 87.
54.5 kilograms would be a better estimate.
Sure, although 4200 is more reasonable.
No. The pressure depends on the depth, and on the density of the liquid, which is presumably more or less the same in this case.
if you are swimming at the same depth the pressure will be the same. Depth affects pressure directly proportionally. That is if you swim deeper the pressure will become greater. If you swim up the pressure will become less. The size of the body of water does not affect pressure. Think of it this way, the further down you swim the more your ears hurt. they hurt because of the increase in pressure.
The purpose of rounding is to simplify calculations so that a reasonable estimate can be obtained quickly, as opposed to a precise answer arrived at after more time.
you can find out more about swimming online or in your local sports centre