A threaded steel rod (Es 5 210 GPa, dr 5 15 mm, ctes 5 12 3 1026/°C.) is held stress-free between rigid walls by a nut and washer (dw 5 22 mm) assembly at each end. If the allowable bearing stress between the washer and wall is 55 MPa and the allowable normal stress in the rod is 90 MPa, the maximum permissible temperature drop DT is approximately:
(A) 25 8C
(B) 30 8C
(C) 38 8C
(D) 46 8C
(A) 25 8C
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A 1.00-kg ball has zero kinetic and potential energy. Ernie drops the ball into a 10.0-m-deep well. Just before the ball hits the bottom, the sum of its kinetic and potential energy is:
a. zero. b. 98.0 J. c. ?98.0 J. d. 196 J. e. ?196 J.
_____ is the site of most of the star formation in the Milky Way Galaxy
A) The disk component B) The spherical component C) The central bulge D) A large halo
It would be easier to pull the hemispheres apart
1) when they are at sea level 2) if submerged several meters in water 3) if high above the clouds because 4) external pressure on the hemispheres is lessened. 5) water serves as a lubricant. 6) the atmosphere exerts a pressure of 105 N/m2 on both hemispheres.
After reviewing the data from Procedures 5 and 6, in general how do you think the voltages across individual elements in a parallel circuit compare with the total voltage supplied to the circuit?