Heat Conduction Through an Annular Wall With Temperature Dependent Conductivity Heat is flowing through an annular wall of inside radius ro and temperature To and outside radius r1 with temperature T1. (see next page) The thermal conductivity k(T) varies linearly with temperature through this region, (a) Obtain an expression for the total heat flow through the wall evaluated at the outer surface. (b) Simplify the above result when (d is the annular thickness, much smaller than the inner radius) in which case and the geometry unravels

When the velocity of an object is doubled, by what factor is its momentum changed? by what factor is its kinetic energy changed? a) the momentum is zero. b) the momentum is not zero. c) difficult to say.

Very large accelerations can injure the body, especially if they last for a considerable length of time. one model used to gauge the likelihood of injury is the severity index ( ), defined as =/ . in the expression, is the duration of the accleration, but is not equal to the acceleration. rather, is a dimensionless constant that = the number of multiples of that the acceleration is equal to.in one set of studies of rear-end collisions, a person's velocity increases by 13.7 km/h with an acceleration of 36.0 m/s2 . let the + direction point in the direction the car is traveling. what is the severity index for the collision?

If element x has 99 protons how many electrons does it have