Radiation Doses: A person receives an absorbed dose of protons of 20 millirads. The RBE of protons is 5. What is this person's equivalent dose in rem?
A. 4 millirem
B. 15 millirem
C. 20 millirem
D. 25 millirem
E. 100 millirem
Answer: E
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Constant Angular Acceleration: A wheel starts from rest and has a uniform angular acceleration of 4.0 rad/s2. After the wheel completes its first revolution, how long does it take for it to make its second complete revolution?
Fill in the blank(s) with the appropriate word(s).
What are the dimensions of area?
What will be an ideal response?
Determine the rate of heat transfer per meter length to a light oil flowing through a 2.5 cm-ID, 60 cm-long copper tube at a velocity of 0.03 m/s. The oil enters the tube at 16°C and the tube is heated by steam condensing on its outer surface at atmospheric pressure with a heat transfer coefficient of 11.3 kW/( m2 K). The properties of the oil at various temperatures are listed in the accompanying tabulation
GIVEN
• Oil flowing through a copper tube with atmospheric pressure steam condensing on the outer surface
• Oil properties listed above
• Inside diameter (D) = 2.5 cm = 0.025 m
• Tube length (L) = 60 cm = 0.6 m
• Oil velocity (V) = 0.03 m/s
• Inlet oil temperature (Tb,in) = 16°C
• Heat transfer coefficient on outside of pipe ( ,c o h )= 11.3 kW/(m2 K)
FIND
• The rate of heat transfer (q) to the oil
ASSUMPTIONS
• Steady state
• The thermal resistance of the copper tube is negligible
• Constant wall temperature
• The tube wall is thin
SKETCH
PROPERTIES AND CONSTANTS
At atmospheric pressure, steam condenses at a temperature (Ts) of 100°C.
Which common gas is less abundant in the top of Saturn's atmosphere, compared to what we observe at Jupiter?
A) methane B) nitrogen C) helium D) hydrogen E) argon