Which of the following is not a unit of radiation dose?
a. rem
b. roentgen
c. rad
d. RBE
d
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A sample of blood is placed into a centrifuge of radius 15.0 cm. The mass of a red corpuscle is 3.0 × 10^-16 kg, and the centripetal force required to make it settle out of the plasma is 4.0 × 10^-11 N. At how many revolutions per second should the centrifuge be operated?
In the context of a planetary atmosphere, what is a bar?
A) a unit of pressure roughly equal to the atmospheric pressure at sea level on Earth B) the surface pressure on any planet C) a description of the atmospheric composition on Earth D) a place where planetary scientists can get sodas and other drinks
SAE 50 oil at 70ºF flows through a 2 ft long copper tube of ¼ inch inside diameter. What must the pressure drop be through the tube if 10 lbm/min of oil is flowing through the tube?
What will be an ideal response?
A steel bolt (area 5 130 mm2, Es 5 210 GPa) is enclosed by a copper tube (length 5 0.5 m, area 5 400 mm2, Ec 5 110 GPa) and the end nut is turned until it is just snug. The pitch of the bolt threads is 1.25 mm. The bolt is now tightened by a quarter turn of the nut. The resulting stress in the bolt is approximately:
(A) 56 MPa
(B) 62 MPa
(C) 74 MPa
(D) 81 MPa
