About what percent of Earth's surface is covered by land?
a. 70%
b. 10%
c. 50%
d. 30%
d
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Air at 0ºC blows across a 3 cm diamter power cable at 20 m/s. If the outside surface of the cable is 50ºC, estimate (a) the heat transfer per unit length and (b) the Drag force in Newtons per meter length of cable.
What will be an ideal response?
The lithosphere "floats" on the asthenosphere, and the parts of lower density float higher. This state of buoyancy is called
a. specific continuity. b. isostasy. c. the syncline anomaly. d. remanent balance.
An astronaut is in an all-metal chamber outside the space station when a solar storm results in the deposit of a large positive charge on the station. Which statement is correct?
a. The astronaut must abandon the chamber immediately to avoid being electrocuted. b. The astronaut will be safe only if she is wearing a spacesuit made of non-conducting materials. c. The astronaut does not need to worry: the charge will remain on the outside surface. d. The astronaut must abandon the chamber if the electric field on the outside surface becomes greater than the breakdown field of air. e. The astronaut must abandon the chamber immediately because the electric field inside the chamber is non-uniform.
Calculate the total circuit resistance of four 12-ohm resistors that are connected in parallel