The upward force exerted by a fluid on an object immersed in it is called the buoyant pressure
Indicate whether the statement is true or false
F
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A pole vaulter clears 3.98 m. With what speed does he strike the mat in the landing area?
a. 78.0 m/s b. 6.25 m/s c. 8.83 m/s d. 4.42 m/s e. 0.226 m/s
Which of the following rocks would be expected to have the coarsest-grained texture?
a) granite b) obsidian c) basalt d) pumice
Doubling the aperture diameter of a camera lens will change the light intensity admitted to the film by what factor?
a. 4.0 c. 0.50 b. 0.25 d. 2.0
At what point do the weak nuclear and electromagnetic forces split?
A) never, they are still united B) at 1012 K, when pair production starts for neutrons and protons C) at 10-43 seconds, when all four forces separate as the Planck Era ends D) at about four seconds, when at millions of degrees hydrogen forms helium E) after about 10-10 seconds, when the temperature drops below 10-15 K