Claudius Ptolemy created an elaborate geometrical and mathematical model to explain details of the observed motions of the planets while assuming:
A) Earth was motionless at the center of the Universe.
B) the Sun was at the center of the Universe.
C) Earth was part of a galaxy.
D) there were many galaxies in the Universe.
A
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Which of the following is a vector quantity?
a. Energy b. Power c. Work d. None of these
The ____________ of a planet is the region around the planet where the magnetic field is able to deflect the solar wind and other charged particles
a. aurora b. magnetosphere c. hydrosphere d. corona e. Schwarzschild radius
Calculate the rate of heat transfer through the composite wall in the temperature difference is 25°C and the contact resistance between the sheets of wood is 0.005 m2 K/W
GIVEN
• Wood wall
? Two layers 0.025-m-thick each, nailed together
• Nail cross sectional area of nails = 0.5% of wall area
• Temperature difference (?T) = 20°C
• Contact resistance (A Ri) = 0.005 (m2 K)/W FIND
• The rate of heat transfer through the wall
ASSUMPTIONS
• One dimensional heat transfer through the wall
• Steady state prevails
SKETCH
PROPERTIES AND CONSTANTS
? Wood (Pine) (kw) = 0.15 W/(m K)
? Mild steel (1% C) (ks) = 43 W/(m K)
Chlorine, Image, is a gas at room temperature, but bromine, Image, is a liquid. Explain
A) Chlorine atoms are larger and this makes the formation of induced dipole-induced dipole attractions more favorable. B) Bromine atoms are larger and this makes the formation of induced dipole-induced dipole attractions more favorable. C) The smaller chlorine molecules are able to pack together in a tighter physical orientation. D) The bromine ions are held together by ionic bonds.