What is the minimum uncertainty in determining the position of an electron if the speed of the electron is 6000 m/s within an accuracy of 0.004%?
A) 0.105 mm
B) 0.153 mm
C) 0.241 mm
D) 0.335 mm
E) 0.483 mm
E
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Concrete has a tensile strength of 3×106 Pa and an elastic modulus of 30×109 Pa. Because the concrete fractures in a brittle manner, it is to be reinforced with 10 vol % uniaxial 1020 steel rebar that has a yield strength of 205×106 Pa, and the steel rods have an elastic modulus of 211×109 Pa.
(a) What is the maximum strain that this composite can withstand without the concrete cracking or the rebar yielding? (b) What is the maximum tensile stress applied parallel to the rebar axis that can be withstood by this reinforced concrete before the concrete cracks or the rebar yields? Assume that there is good bonding between the concrete and the rebar.
The type of mirror that will allow you to see large areas normally hidden from your view is
a. concave. b. convex. c. plane. d. half-silvered. e. Polaroid.
The closest object that a typical young person with normal vision can focus on clearly is closest to
A) 1 cm. B) 10 cm. C) 25 cm. D) 50 cm. E) 75 cm.
The bathyscaphe Trieste consists of a thin-walled but very strong cylindrical hull, 15.2 m long and 3.66 m in diameter,
filled with gasoline with a density of 880 kg/m3 to make it buoyant. If it is totally submerged in seawater with a density of 1025 kg/m3 and neither rising nor sinking, what is the weight of the Trieste craft? A) 127 kN B) 227 kN C) 327 kN D) 427 kN E) 527 kN