) A submarine descends to a depth of 70 m below the surface of water. The density of the water is 1050 kg/m3. Atmospheric pressure is 1.0  105 Pa.

Calculate

(i) the increase in pressure as it descends from the surface to a depth of 70 m,

increase in pressure =

(ii) the total pressure on the submarine at a depth of 70 m.

total pressure =

The force acting on a beam was measured under the same operating conditions and a sample of 5 data points was collected. this process was repeated by 3 observers. the pooled standard deviations of these 3 data sets was 1.21. determine the true mean force using all pooled data (with a 95% probability). the result should look like this: true mean = mean +/- margin of error

Which additional product balances the reaction h2so4 + 2naoh → na2so4 + 2h2o 2oh h2o2 h3o

Select the correct answer. what does the process of natural selection involve?