A 1998 Lexus LS400 has a drag coefficient of 0.28 and a reference area of 2.4 m2. Determine the horsepower required to overcome drag when driving at 30 m/s (which is approx. 67 mph) at sea level. a) on a summer day T ~ 300K (which is approx. 800F); b) on a very cold winter day T ~ 250K (which is approx. -100F) . Hints: Use the SI units, air

Apiston-cylinder with a volume of 0.25 m3 holds 1 kg of air (r 0.287 k/kgk) at a temperature of 100 c. heat transfer to the cylinder causes an isothermal expansion of the piston until the volume triples. how much heat is added to the piston-cylinder?

Thermal stresses are developed in a metal when its a) initial temperature is changed b) final temperature is changed c) density is changed d) thermal deformation is prevented e) expansion is prevented f) contraction is prevented

Aturning operation is performed with following conditions: rake angle of 12°, a feed of 0.35 mm/rev, and a depth of cut of 1.1 mm. the work piece is aluminum alloy 6061 with t6 heat treatment (a16061-t6). the resultant chip thickness was measured to be 1.0 mm. estimate the cutting force, fc. use shear stress of 207 mpa and coefficient of friction on the tool face of 0.6.