At what angle should the roadway on a curve with a 50m radius be banked to allow cars to negotiate the curve at 12 m/s even if the roadway is icy (and the frictional force is zero)?
举一反三
- The tracks of high-speed train must have a ________ A: longer curve radius B: shorter curve radius C: thinner curve radius D: wider curve radius
- Compared with the district, there is no in the roadway system of the strip district, and the roadway system is greatly simplified.
- The section arranged by the panel roadway is divided into rectangles, and the section roadway is excavated along .
- If the market price of a good is above the equilibrium price ______ A: a surplus will exist, which will put downward pressure on the prices. B: the supply curve will shift to the right as firms rush to take advantage of the high price. C: the demand curve will shift to the left as consumers decrease the quantity they buy. D: the government will intervene to force the price downward. E: a shortage will exist, which will force the price even higher.
- Ungated _____ should only be permitted where the sight distance from the roadway exceeds 100 meters. A: fencing B: ailroad crossings