Problem: Whereas SCIMs cannot turn a shaft faster than allowed by the power line frequency, universal motors can run at much higher speeds. This makes them useful for appliances such as blenders, vacuum cleaners, and hair dryers where high speed and light weight are desirable. They are also commonly used in portable power tools, such as drills, sanders, circular and jig saws, where the motor's characteristics work well. Many vacuum cleaner and weed trimmer motors exceed 10,000 rpm, while many similar miniature grinders exceed 30,000 rpm.
At around what RMP do miniature grinders operate?
The answer is the following: 30,000

Problem: The Great Garden is an important European baroque garden. The palace itself, however, was largely destroyed by Allied bombing but is currently under reconstruction.[citation needed] Some points of interest are the Grotto (the interior was designed by the French artist Niki de Saint-Phalle), the Gallery Building, the Orangerie and the two pavilions by Remy de la Fosse. The Great Garden consists of several parts. The most popular ones are the Great Ground and the Nouveau Jardin. At the centre of the Nouveau Jardin is Europe's highest garden fountain. The historic Garden Theatre inter alia hosted the musicals of the German rock musician Heinz Rudolf Kunze.[citation needed]
What is at the centre of the Nouveau Jardin?
The answer is the following: Europe's highest garden fountain

Problem: The city receives 49.9 inches (1,270 mm) of precipitation annually, which is fairly spread throughout the year. Average winter snowfall between 1981 and 2010 has been 25.8 inches (66 cm), but this varies considerably from year to year. Hurricanes and tropical storms are rare in the New York area, but are not unheard of and always have the potential to strike the area. Hurricane Sandy brought a destructive storm surge to New York City on the evening of October 29, 2012, flooding numerous streets, tunnels, and subway lines in Lower Manhattan and other areas of the city and cutting off electricity in many parts of the city and its suburbs. The storm and its profound impacts have prompted the discussion of constructing seawalls and other coastal barriers around the shorelines of the city and the metropolitan area to minimize the risk of destructive consequences from another such event in the future.
In centimeters, what is the average winter snowfall?
The answer is the following: 66

Problem: Three Han mathematical treatises still exist. These are the Book on Numbers and Computation, the Arithmetical Classic of the Gnomon and the Circular Paths of Heaven and the Nine Chapters on the Mathematical Art. Han-era mathematical achievements include solving problems with right-angle triangles, square roots, cube roots, and matrix methods, finding more accurate approximations for pi, providing mathematical proof of the Pythagorean theorem, use of the decimal fraction, Gaussian elimination to solve linear equations, and continued fractions to find the roots of equations.
What achievement of the Han era can be used to help solve linear equations?
The answer is the following:
Gaussian elimination