Describe Couette flow
What will be an ideal response?
Couette flow is the situation of a fluid between two surface or blocks, one
sliding past the other one. Typically this is the preliminary model for lubricant or
wet friction between two objects sliding past each other.
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An electric car is designed to run off a bank of 14.0-V batteries with total energy storage of 3.00 × 10^7 J. If the electric motor draws 7 000 W, what current will be delivered to the motor?
a. 500 A b. 250 A c. 750 A d. 375 A e. 125 A
A wood block is placed on top of the ice in a large bowl half full of ice. The bowl is then filled to the brim with water, with the wood block riding on top of the ice. As the ice melts,
a. the density of the water decreases. b. the water level falls below the rim. c. the water level rises and water spills out of the bowl. d. the water level does not change. e. the wood block descends, causing water to spill out of the bowl.
If WIMPs really exist and make up most of the dark matter in galaxies, which of the following is not one of their characteristics?
A) They travel at speeds close to the speed of light. B) They are subatomic particles. C) They can neither emit nor absorb light. D) They tend to orbit at large distances from the galactic center.
A capacitor in a single-loop RC circuit is charged to 85% of its final potential difference in 2.4 s. What is the time constant for this circuit?
a. 1.5 s b. 1.3 s c. 1.7 s d. 1.9 s e. 2.9 s