How much horsepower would a high performance car need to run the speed of sound arrive before the sound of its engine arrives? assuming 4514 lb curb weight assume no wind assume no driveline losses of vehicle travelling at the speed of sound (760 mph - 1116.4ft/sec) what you need to know: hp fsum x v/hp f drag 1/2 pv*2 cda f rolling resistance crr x weight f sum f drag +f rolling resistance cd .398 a 26.72 fta2 crr .015 p.002377 slugs/ft 3

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.

Which transition by an electron will release the greatest amount of energy? oa ob oc od

Considering only the earth's rotation, determine how much later the asteroid would have had to arrive to put the explosion above helsinki at longitude 25˚ e? this would have obliterated the city.