The total charge a battery can supply is rated in ma⋅h, the product of the current (in ma) and the time (in h) that the battery can provide this current. a battery rated at 1000 ma⋅hr can supply a current of 1000 ma for 1.0 h, 500 macurrent for 2.0 h, and so on. a typical aa rechargeable battery has a voltage of 1.2 v and a rating of 1800 ma⋅h. for how long could this battery drive current through a long, thin wire of resistance 28 ω ?

An ideal otto cycle has a compression ratio of 8. at the beginning of the compression process, air is at 95 kpa and 27°c, and 750 kj/kg of heat is transferred to air during the constant-volume heat-addition process. assuming constant specific heats at room temperature, determine (a) the pressure and temperature at the end of the heat-addition process, (b) the net work output, (c) the thermal efficiency, and (d) the mean effective pressure for the cycle. (4390 kpa, 1730 k; 423 kj/kg; 56.4%; 534 kpa)