Which of the following statements about energy conversion is true???
A. ?Photosynthesis in a leaf converts potential chemical energy into electromagnetic energy when utilizing sunlight to make carbohydrates.
B. ?A ceiling fan converts kinetic energy into electromagnetic energy by moving air with rotating blades.?
C. ?The whirling impeller of a pump converts electric energy into electromagnetic energy by lifting water into an elevated tank.?
D. ?A solar cell converts the electromagnetic energy of sunlight into electricity.?
Answer: D
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A system containing only ____ is the easiest situation to coordinate.
A. main circuit breakers B. branch-circuit breakers C. ground-fault protectors D. fuses
Answer the following statements true (T) or false (F)
1. The mercantilist philosophy argues that nations can become rich and powerful by exporting more than they import. 2. Comparative advantage states that a nation will export the foods that it can produce more cheaply than others and import goods that other nations can produce more cheaply. 3. Opportunity costs reflect the cost of a good as measured by the amount of a second good that must be given up in order to produce one additional unit of the first good. 4. Comparative advantage is a monetary concept and is affected by changes in exchange rates or inflation. 5. Comparative advantage based on nonmarket factors are dependent on politics rather than economics for sustained existence.
Using sketches, explain the commonly used beamless concrete floor systems.
What will be an ideal response?
A ramp from an expressway with a design speed of 30 mi/h connects with a local road, forming a T intersection. An additional lane is provided on the local road to allow vehicles from the ramp to turn right onto the local road without stopping. The turning roadway has stabilized shoulders on both sides and will provide for a onelane, one-way operation with no provision for passing a stalled vehicle. Determine the width of the turning roadway if the design vehicle is a single-unit truck. Use 0.08 for superelevation.
What will be an ideal response?