Complete the following statement: Around any closed-circuit loop, the sum of the potential drops
a) dramatically with the addition of each resistor.
b) in each loop is the same.
c) equals the sum of the potential rises.
d) equals the emf of the battery.
e) increases with the addition of each resistor.
Ans: c) equals the sum of the potential rises.
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Two very thin lenses, each with focal length 20. cm, are placed in contact. What is the focal length of this compound lens?
A) 15. cm B) 10. cm C) 30. cm D) 40. cm E) 20. cm
Two small cylindrical plastic containers with flat bottoms are placed on a turntable that has a smooth flat surface. Canister A is empty; canister B contains lead shot. Each canister is the same distance r from the center. The coefficient of static friction between the canisters and the turntable is ms. When the speed of the turntable is gradually increased,
a. only the lighter container slides outward off the turntable; the heavier one stays on. b. only the heavier container slides outward off the turntable; the lighter one stays on. c. both containers slide off the turntable at the same turntable speed. d. the lighter container slides inward. e. the heavier container slides inward.
Write an appropriate dimensionless correlation for the average Nusselt number for these data and state any limitations to your equation.
Suppose that the graph below shows measured values of hc for air in forced convection over a cylinder of diameter D plotted on a logarithmic graph of NuD as a function of ReDPr.
GIVEN
Forced convection of air over a cylinder
Experimental data given above
FIND
An appropriate dimensionless correlation for the average Nusselt number
There are currently considered to be _________ basic building blocks for elementary particles and _________ different forces in the universe
a. 4 / 25 b. 8 / 4 c. 4 / 8 d. 6 / 4 e. 25 / 4