A gasoline engine operates steadily on a mixture of isooctane and air. The air and fuel enter the engine at 25 C. The fuel consumption is 0.15 g/s. The output of the engine is 1.0 kW. The temperature of the combustion products in the exhaust manifold is 700 K. At this temperature, an analysis of the combustion products yields the following values (on a dry volumetric basis). CO = 2.9%; CO2 = 11.4%; O2 = 1.6%; N2 = 84.1% a) Find the number of moles of each of the reactants and the products species per mole of isooctane. N. B. Use O2 + 3.76N2 as air; equation will not perfectly balance. b) Determine the heat transfer rate from the working fluid as the working fluid passes through the engine.

Agymnast dismounts off the uneven bars in a tuck position with a radius of 0.3m (assume she is a solid sphere) and an angular velocity of 2rev/s. during the dismount she stretches out into the straight position, with a length of 1.5m, (assume she is a uniform rod through the center) for her landing. the gymnast has a mass of 50kg. what is her angular velocity in the straight position?

For problems 1-3, consider a simple dc brush motor with a permanent magnet stator. with an an consider a simple dc brush motor with a permanent magnet ae supply voltage of 100 v, the no-load speed of the motor is 1000 rpm. this motor can provide a torque of 1.9 n-m at 800 rpm drawing a current of 2 a current are both zero at no load.) 1. with an armature supply voltage of 100 v, the motor is operated at 900 rpm. what is the motor torque? what is the mechanical power delivered by the motor? what is the current draw? what is the electrical power input? what is the energy efficiency of the motor? with an armature supply voltage of 100 v, the motor is operated at 1100 rpm (where it acts as a generator). what torque input is required? what mechanical power is required what current is generated? what is the electrical power generated? what is the energy efficiency of the motor acting as a generator? 2. with an armature supply voltage raised to 120 v, the motor is operated at 1000 rpm. what is the no-load speed? what is the motor torque? what is the mechanical power delivered by the motor? what is the current draw? what is the electrical power input what is the energy efficiency of the motor? 3.

Calculate the mass of an object that has a momentum of 100kg x m/sec and velocity of 4 m/sec