About a thousand trillion neutrinos are passing through your body every second. Why don't they hurt you?
A) Neutrinos interact with ordinary matter only through the weak force.
B) Their masses are too low to cause any damage.
C) They are traveling too slowly to cause any damage.
D) Our immune systems release antibodies that counteract the damage the neutrinos cause.
E) Actually, they do—neutrinos are the cause of many cancers.
A) Neutrinos interact with ordinary matter only through the weak force.
You might also like to view...
Which source is the most luminous (or would be, if all its energy were output in visible light)?
a) The Sun. b) A quasar. c) A nuclear power plant. d) A gamma-ray burst. e) A supernova.
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.
Magnetic Field of a Long Wire: A long, straight wire carrying a current is placed along the y-axis. If the direction of the current is in the +y direction, what is the direction of the magnetic field due to this wire as you view it in such a way that the current is coming directly toward you?
A. clockwise, around the x-axis B. counterclockwise, around the x-axis C. counterclockwise, around the z-axis D. counterclockwise, around the y-axis E. clockwise, around the y-axis
Black holes
A) are holes in space, devoid of matter. B) cannot be detected in binary star systems. C) are the collapsed remnant of stars. D) are predicted by Einstein's special theory of relativity.