The maximum permissible workday dose for occupational exposure to radiation is 18 mrem. A 54-kg laboratory technician absorbs 2.6 mJ of 0.30-MeV gamma rays in a work day
The relative biological effectiveness (RBE) for gamma rays is 1.00. What is the ratio of the equivalent dosage received by the technician to the maximum permissible equivalent dosage?
A) 0.27
B) 0.29
C) 0.32
D) 0.35
E) 0.37
A
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Forces and couples are applied to ABCDE as shown in the figure. All turns of ABCDE are 90o angles. The statically equivalent moment at A (MA) for the force2couple system is (in N?m)
(A) 2160i 1 575j 1 1480k
(B) 160i 1 425j 1 1380k
(C) 2160i 1 325j 1 1380k
(D) 2160i 1 325j 2 1480k
The component in CFCs that is responsible for destroying ozone is ______________
Fill in the blank(s) with correct word
During the course of a demonstration the professor is called away. When he returns he finds a beaker of water that was at room temperature is now at a slightly higher temperature. There is a stirring rod on the desk and a cigarette lighter. The professor can assume that the temperature increase is due to
A. heat added to the system. B. either heat added or mechanical work done. C. mechanical work done on the system.
When a ray of light passes obliquely from one medium to another, which of the following changes?
A) direction of travel B) speed, direction of travel, but not wavelength C) wavelength D) wavelength, speed, & direction of travel E) speed