A(n) ______________ covalent bond is one in which the electrons are shared unequally
Fill in the blank(s) with correct word
polar
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Nearly every aspect of astronomy is related in some way to the existence of gravity and to the motions which are responsible for a balance against gravity
How does this balance play a role for the miscellaneous objects of the solar system (i.e., the asteroids and comets)? How can some aspect of this be used as a tool to determine masses in the solar system?
What evidence is there for scientists to believe Uranus has some internal heat?
a. active volcanoes spewing methane gas and ash b. convection in the fluid mantle driving the dynamo effect c. a molten metallic core d. craters on the surface that are small and filled by lava e. a severe axis tilt leads to more absorption of heat from the Sun
A section of a composite wall with the dimensions shown below has uniform temperatures of 200°C and 50°C over the left and right surfaces, respectively. If the thermal conductivities of the wall materials are: kA = 70 W/(m K), kB = 60 W/(m K), kc = 40 W/(m K) and kD = 20 W/(m K), determine the rate of heat transfer through this section of the wall and the temperatures at the interfaces. including a contact resistance of 0.1 K/W at each of the interfaces.
GIVEN
• Composite wall
• Thermal conductivities:
? kA = 70 W/(m K)
? kB = 60 W/(m K)
? kC = 40 W/(m K)
? kD = 20 W/(m K)
• Surface temperatures
? Left side (TAs) = 200°C
? Right side (TDs) = 50°C
• Contact resistance at each interface (Ri) = 0.1 K/W FIND
(a) Rate of heat transfer through the wall (q) (b) Temperatures at the interfaces
ASSUMPTIONS
• One dimensional conduction
• The system is in steady state
SKETCH
Assume when using a meter stick measuring can be done so that the last significant figure is in the tenth of a millimeter digit. If you are measuring an object with length between 25 and 53 cm, how many significant figures will result if you only use the part of the meter stick between the 3-cm and 85-cm positions?
a. 1 b. 2 c. 3 d. 4 e. more than 4