A jet plane has a sound level of 150 dB. What is the intensity in W/m2?
a. 1
b. 100
c. 10
d. 1 000
e. 10 000
d
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In the process of breaking down the ozone layer, the chlorine from the CFCs acts as a ________
Fill in the blank(s) with correct word
A converging lens always forms an object's image at the focal point of the lens
a. True b. False Indicate whether the statement is true or false
The units of momentum are
A. ML/T.
B. M/T.
C. 
D. 
E. 
A prismatic bar (diameter d0 5 18 mm) is loaded by force P1. A stepped bar (diameters d1 5 20 mm and d2 5 25 mm with radius of fillets R 5 2 mm) is loaded by force P2. The allowable axial stress in the material is 75 MPa. The ratio P1/P2 of the maximum permissible loads that can be applied to the bars, considering stress concentration effects in the stepped bar, is:
(A) 0.9
(B) 1.2
(C) 1.4
(D) 2.1
