When a battery-operated toy stopped working, the old batteries were replaced with new ones. After replacing the batteries, the toy still did not work. What is the most likely reason the toy is still not working? A. Electric current is flowing through a closed loop.
B. One wire in the electric circuit is not connected to the switch.
C. The toy needs plugged into an outlet.
D. The switch is connected to two wires in the electric circuit.

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?