(1) In the circuit on the right, a battery of 30 Volts produces a current of 6.0 Amperes when connected to a resistance, X. a. What is the resistance of wire X?

b. If the battery is replaced with a battery of 50 V, what will happen to

i. the potential difference across MN?

ii. the resistance of wire X?

iii. the current read by the ammeter?

c. If in the original circuit , wire X were to be replaced by a wire 5 times longer than wire X, what will happen to:

i. The potential difference across MN?

ii. The resistance of the longer wire?

iii. The current read by the ammeter?

d. If in the original circuit, wire X were to be replaced by a piece of solid rubber of the same length, what will happen to:

i. The potential difference across MN?

ii. The resistance across MN?

iii. The current read by the ammeter?

A3-mm-thick panel of aluminum alloy (k 177 w/m-k, c 875 j/kg-k and ? = 2770 kg/m) is finished on both sides with an epoxy coating that must be cured at or above t,-150°c for at least 5 min. the production line for the curing operation involves two steps: (1) heating in a large oven with air at ts,0-175°c and a convection coefficient of h, 40 w/m2. k, and (2) cooling in a large chamber with air at 25°c and a con- vection coefficient of he 10 w/m2.k. the heating portion of the process is conducted over a time interval te which exceeds the ime required to reach 150°c by 5 min (h = r + 300 s). the coating has an emissivity of ? = 0.8, and the temperatures of the oven and chamber walls are 175 and 25°c, respectively. if the panel is placed in the oven at an initial temperature of 25°c and removed from the chamber at a safe-to-touch tempera ture of 37°c, what is the total elapsed time for the two-step curing operation?