A point is turning along the circular path with R = 30 cm at constant angular acceleration ε. Find the tangential and total accelerations of the point if it made 3 revolutions for 4 s

and its normal acceleration was 2.7 m/s2

at this instant. Find the linear and angular

velocities at this instant.

Asquare isothermal chip is of width w=5 mm on a side and is mounted in a substrate such that its side and back surfaces are well insulated; the front surface is exposed to the flow of a coolant at tinf=15 °c. from reliability considerations, the chip temperature must not exceed t=85 °c. if the coolant is air and the corresponding convection coefficient is h=200 w/m2 x k, what is the maximum allowable "power" of the chip? if the coolant is a liquid for which h=3000 w/m2 x k, what is the maximum allowable power of the chip?