It depends on what the car is being used for. The 310 at 1750 would be better for stop / start traffic, and most "real world" situations.
342 at 6200 would hardly be used unless you were driving a race car. (Or enjoy revving out your engine every gear change).
1750 C is the higher temperature. To convert C to Kelvin add 273.16 so 1750 0C= 1750 + 273.16 = 2023.16 K which is higher than 1860 K. However, the question is wrong as the melting point for lead is 327.5 0C .
it changes because it gets better
No. The older the violin, the better the sound.
The 2013 Bentley Mulsanne's engine produces 752 ft-lbs. @ 1750 rpm.
The 2011 Bentley Mulsanne's engine produces 752 ft-lbs. @ 1750 rpm.
The 2001 Volkswagen Passat's engine produces 155 ft-lbs. @ 1750 rpm.
The 2014 Maserati Ghibli's engine produces 369 ft-lbs. @ 1750 rpm.
The 2012 Bentley Mulsanne's engine produces 752 ft-lbs. @ 1750 rpm.
The 2014 Audi RS-7's engine produces 516 ft-lbs. @ 1750 rpm.
25% of 1750= 25% * 1750= 0.25 * 1750= 437.5
25% of 1750= 25% * 1750= 0.25 * 1750= 437.5
The 2010 Bentley Continental-GT-Speed's engine produces 553 ft-lbs. @ 1750 rpm.