Germanium to which 1024 m-3 ga atoms have been added is an extrinsic semiconductor at room temperature, and virtually all the ga atoms may be thought of as being ionized (i. e., one charge carrier exists for each ga atom). calculate the electrical conductivity of this material in (ω·m)-1 , assuming electron and hole mobilities of 0.26 and 0.020 m2 /(v·s), respectively

The momentum of an isolated system is conserved a) only in inelastic collisions. b) only in elastic collisions. c) in both elastic and inelastic collisions

Review multiple-concept example 7 in this chapter as an aid in solving this problem. in a fast-pitch softball game the pitcher is impressive to watch, as she delivers a pitch by rapidly whirling her arm around so that the ball in her hand moves in a circle. in one instance, the radius of the circle is 0.626 m. at one point on this circle, the ball has an angular acceleration of 66.1 rad/s2 and an angular speed of 12.6 rad/s. (a) find the magnitude of the total acceleration (centripetal plus tangential) of the ball. (b) determine the angle of the total acceleration relative to the radial direction.

The power exerted by a muscle is the product of the force exerted and the velocity of contraction. the area of which of these shaded regions represents the power exerted while a weight is lifted at maximum speed?