A5-in. diameter, gray cast iron cylindrical part is to be turned on a lathe at 500 rpm. the depth of cut is 0.25 in. and the feed is 0.02 in./rev. what power (hp) is required for this operation? assume that the energy requirement for machining cast irons is 2.0 hp. min/in3 . [hint: the power (hp) = energy per unit vol. multiplied by mrr].

The y form of iron is known as: a) ferrite b) cementite c) perlite d) austenite

Adouble-strand no. 60 roller chain is used to transmit power between a 13-tooth driving sprocket rotating at 300 rev/min and a 52-tooth driven sprocket. a) what is the allowable horsepower of this drive? b) estimate the center-to-center distance if the chain length is 82 pitches. c) estimate the torque and bending force on the driving shaft by the chain if the actual horsepower transmitted is 30 percent less than the corrected (allowable) power.

At 12 noon, the count in a bacteria culture was 400; at 4: 00 pm the count was 1200 let p(t) denote the bacteria cou population growth law. find: (a) an expression for the bacteria count at any time t (b) the bacteria count at 10 am. (c) the time required for the bacteria count to reach 1800.