Problem 141E

The time between failures of a laser in a cytogenics machine is exponentially distributed with a mean of 25,000 hours.

(a) What is the expected time until the second failure?

(b) What is the probability that the time until the third failure exceeds 50,000 hours?

Systemic Circulation -Heart -Arteries -Arterioles -Capillaries -Venules -Veins Factors Affecting Blood Flow -Pressure -force exerted on a liquid unit per area -measured in mm of Hg -Resistance -opposition to force -diameter and length of the blood vessels contribute to resistance -inversely related to blood flow. Blood flow is measured in L/min (CO) -Velocity -Velocity is the distance blood travels in a unit of time (cm/sec) -Laminar vs. turbulent flow -Laminar straight ahead vs. turbulent flow obstructed flow causing whirls and eddys. Can hear murmur on auscultation -Vascular compliance -Vascular compliance is the ability of vessel to take on more value with increased pressure. -Stiffness is opposite of compliance. -Veins have mor