Sample Response: Yes, the law of conservation of momentum is satisfied. The total momentum before the
collision is 1.5 kg. m/s and the total momentum after the
collision is 1.5 kg. m/s. The momentum before and after
the collision is the same.

What did you include in your response? Check all that apply

O The law of conservation of momentum is satisfied.
The momentum before the collision is 1.5 kg. m/s.
O The momentum after the collision is 1.5 kg . m/s.
The momentum before and after the collision is the
same.
Intro
✓ Done

Aroll in a paper machine is powered by a separately excited dc machine. operating point 1 (under load): the roll typically operates at 764 rpm and must provide 301 nm of torque to oppose the load of the paper. the armature voltage is 230v for this operating point operating point 2 (no load): when the load is removed the speed of the roll increases to 900 rpm (the field characteristics are unchanged) la ea dev m (a) calculate the maximum torque (units of nm) that the motor can supply with this applied voltage (b) calculate the value of the armature resistance, ra (in ohms) (c) at operating point 1 (loaded condition), the field current, i, and the total input power (armature field), are measured to be to be 10 a and 28,600 w respectively. use this information to calculate the value of the field resistance, rf (in ohms). (d) (d) at operating point 1 (loaded condition), calculate the motor efficiency. express your answer as a percent to at least 2 significant digits. (d) if the field voltage is reduced by 1/2, calculate the new stall torque (in nm) of the motor (f). if the field voltage is reduced by 1/2, calculate the new no-load speed (in rad/sec)

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