Rifle and bullet a 0.0275 kg bullet is accelerated from rest to a speed of 530 m/s in a 2.55 kg rifle (which is inititally at rest). the pain of the rifle’s kick is much worse if you hold the gun loosely a few centimeters from your shoulder rather than holding it tightly against your shoulder.

(a) take the bullet's velocity as positive. calculate the recoil velocity (in m/s) (with a proper sign) of the rifle if it is held loosely away from the shoulder. 0 m/s incorrect (0.0%) (4 attempts remaining)input 1 statusincorrect (0.0%)4 attempts remaining.
(b) how much kinetic energy (in joules) does the rifle gain? 0 j incorrect (0.0%) (4 attempts remaining)input 2 statusincorrect (0.0%)4 attempts remaining.
(c) what is the recoil velocity (in m/s) if the rifle is held tightly against the shoulder, making the effective mass 27.55 kg? 0 m/s incorrect (0.0%) (4 attempts remaining)input 3 statusincorrect (0.0%)4 attempts remaining.
(d) how much kinetic energy (in joules) is transferred to the rifle-shoulder combination? the pain is related to the amount of kinetic energy, which is significantly less in this latter situation. 0 j

The 10-kg double wheel with radius of gyration of 125mm about o is connected to the spring of stiffness k = 600 n/m by a cord which is wrapped securely around the inner hub. if the wheel is released from rest on the incline with the spring stretched 225 mm, calculate the maximum velocity v of its center o during the ensuing motion. the wheel rolls without slipping

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.

Awater slide of length l has a vertical drop of h. abby's mass is m. an average friction force of magnitude f opposes her motion. she starts down the slide at initial speed vi. use work-energy ideas to develop an expression for her speed at the bottom of the slide. then evaluate your result using unit analysis and limiting case analysis. express your answer in terms of the variables h, m, l, vi, f and appropriate constants. vf v f