A horizontal 80-cm-diameter hatch is located on the top of a submersible designed for a diver to escape. If the submersible is 100 m below the surface of the ocean, estimate the minimum force required to open the hatch. Assume Ssaltwater = 1.02.
(A) 300 kN
(B) 400 kN
(C) 500 kN
(D) 600 kN
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A roadway is designed for traffic moving at a speed of 94 m/s. A curved section of the roadway is a circular arc of 740 m radius. The curved section is temporarily replaced with an unbanked roadway of the same radius
The coefficient of friction of this roadway is 0.40. The maximum safe driving speed for this unbanked, curved section is closest to: A) 54 m/s B) 52 m/s C) 50 m/s D) 48 m/s E) 46 m/s
Why do Newton's Laws show a force must be acting on the planets?
What will be an ideal response?
A double-slit interference experiment is performed in the air. Later, the same apparatus is immersed in benzene (index of refraction, n = 1.50), and the experiment is repeated
When the apparatus is in benzene, you observe the interference fringes to be A) more closely spaced as when the apparatus is in air. B) equally spaced as when the apparatus is in air. C) more widely spaced as when the apparatus is in air. D) Impossible to tell without knowing the wavelength of light in use. E) Impossible to tell without knowing the separation between the slits.
What is the proper abbreviation for ‘grams?'
a. g b. gms c. gm d. gr e. kg