Question

For a boeing 787-8 it is plausible to assume that the fuel burn metric with full payload is about 0.147 kg-fuel/atk (which is kg of fuel burned per available tonne-kilometre) for maximum payload and maximum take-off mass (so range is r1). Use data from table to convert the fuel metric into passenger-miles per us and per imperial gallon. Take 1 us gallon to be 3.79 litre and 1 imperial gallon to be 1.201 us gallon, with 1 litre of jet fuel assumed to weigh 0.808 kg.

Answer 1

A spring of force constant k is cut into lengths of ratio 1 : 2 : 3. They are connected in series and the new force constant is k'. Then they are connected in parallel and force constantis k''. Then k' : k'' is(a) 1 : 9(b) 1 : 11(c) 1 : 14(d) 1 : 6