The shaft, made of aisi 1040 cd steel, rotates at 1600 rpm and is supported in the rolling bearings at a and b. the applied forces are f1=2500 lbf and f2=1000 lbf. determine the minimum fatigue factor of safety based on achieving infinite life. if infinite life is not predicted, estimate the number of cycles to failure. also check for yielding. (hint: use attached charts to calculate static stress concentration factors kt and kts and dynamic stress concentration factors kf and kfs at steps in shaft.)

In science and physics what is the standard unit of measure for speed?

If the textbook weighs 19.6 newtons on venus,what is the strength of gravity on venus?

Aparticle's position is given by x = 3.00 - 9.00t + 3t2, in which x is in meters and t is in seconds. (a) what is its velocity at t = 1 s? (b) is it moving in the positive or negative direction of x just then? (c) what is its speed just then? (d) is the speed increasing or decreasing just then? (try answering the next two questions without further calculation.) (e) is there ever an instant when the velocity is zero? if so, give the time t; if not, answer "0". (f) is there a time after t = 3 s when the particle is moving in the negative direction of x? if so, give the time t; if not, answer "0".