It’s refreshing to see a genre film-maker do more than rely on simple tricks and although his knack for dialogue might be questionable, he’s more than capable of constructing a nifty set-piece. As the film progresses, Roberts consistently amps up the action and the stakes and as he races towards the final act he thankfully avoids crowbarring in another silly twist, instead engineering a ferocious, gasp-inducing finale on the open water. While it might not be as inventive as this summer’s other surprisingly effective creature feature Crawl, 47 Meters Down: Uncaged does possess a similar unwillingness to rest on its laurels. It’s also hard to distinguish between them when they’re underwater, although given their non-existent personalities, it really doesn’t matter too much. The teens, who include Jamie Foxx’s daughter Corinne and Sylvester Stallone’s daughter Sistine, are all equally forgettable, as is most of their dialogue: their early banter, scripted by two men in their 40s, proves particularly embarrassing. It might be PG-13 but unlike last year’s disastrously de-gored The Meg, it never feels tamed for a wider audience, with sharply edited death scenes mostly having a suitably nasty effect. Not that Jaws, or at least Deep Blue Sea, fans won’t go home happy, with Roberts packing the 86-minute film with enough effective, if not earth-shattering, action sequences. It’s The Descent meets Sanctum but with screechy teens, and it’s this added jeopardy that prevents it from becoming yet another shark movie. ![]() Without the restriction of a cage (check out that clunky title!), Roberts, who also co-wrote the script, has created a more ambitious survival thriller that relies not only on the girls avoiding sharp-toothed predators but also managing to find a way out of a string of precarious underwater locations. In what passes for a plot, four teenage girls make the ill-advised decision to explore an underwater Mayan temple and find themselves trapped, oxygen quickly decreasing and, yup, sharks quickly circling. The follow-up retains the British director Johannes Roberts, who has since added a slick sheen to a mostly unnecessary Strangers sequel, and this time around he’s been given what feels like a slight upgrade in budget, working hard to make a film designated for the big rather than small screen. Despite its modest ambitions and solid reviews, I was still rather lukewarm on it, weary of its repetitive nature and aghast at its dim final twist. As a result, you would feel the same water pressure if you were in these containers of the same height.It told the story of sisters whose cage dive goes horribly wrong when a technical fault leaves them marooned in shark-infested water, stuck on the ocean floor. But remember that the cone is also supporting some weight of the water! The surface of the cone is facing upward while the wall of the test tube is vertical and cannot support any water. This may be a little counter-intuitive because there is more water in a giant ice cream cone than a giant test tube. You mentioned an important point that water pressure is the same at the same depth, regardless of the shape of the container. For example, we can measure how much force is exerted by water and divide it by the area of the detector. The presence of water pressure does not require air, so we can measure pressure directly under water. In water (or air), the weight of the water (or air) above you exerts a force on you, so you feel water pressure (or atmospheric pressure). For example, when you press a button, you are putting pressure on it. Every force that acts on a surface corresponds to a pressure. Pressure is how much force you feel per unit area. ![]() (published on ) Follow-Up #1: density of water To get to 29.4 psi, it turns out that you would need to be 33 feet deep. In order to get to 2 atmospheres worth of air pressure, you would need to get to the point where there’s 29.4 psi (2 times 14.7 psi). ![]() And at two feet deep it would be 14.7 psi + 2*(0.445 psi) = 15.59 psi, etc. So at one foot deep, the pressure would be 14.7 psi + 0.445 psi = 15.145 psi. And for every foot you go underwater, you add another 0.445 psi. So if you’re right at sea level, the pressure will be 14.7 psi. Each one inch column that’s one foot deep will weigh 0.445 pounds. For this reason, we like to say that the standard air pressure (at sea level) is 14.7 pounds per square inch (psi). If we were to take a one inch column of air all the way up through the atmosphere, it would weigh 14.7 pounds. First, we have to understand how pressure is measured. Well, let’s see if we can work this one out.
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