Abullet is fired into a block of wood sitting on a block of ice. the bullet has an initial velocity of 800 m/s and a mass of .007 kg. the wooden block has a mass of 1.3 kg is and is initially at rest. the bullet remains in bedded in the blackboard afterward.
assuming that momentum is conserved what is the velocity of the block of wood and bullet after the collision? round to the nearest hundredths place.
what is the magnitude of the impulse that axle a block of wood in this process? round to the nearest hundredths place.

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.