Question: A 250-V, 4-pole, wave-wound d.c. series motor has 782 conductors on itsarmature. It has armature and series field resistance of 0.75 ohm. The motor takesa current of 40 A. Estimate its speed and gross torque developed if it has a flux per pole of 25 mWb Answer: Step 1 Mechanical Engineering homework question answer, step 1, image 1 Mechanical Engineering homework question answer, step 1, image 2 Step 2 Mechanical Engineering homework question answer, step 2, image 1 Step 3 Mechanical Engineering homework question answer, step 3, image 1

Link will be apear in 30 seconds.

Well done! you have successfully gained access to Decrypted Link.

 

Textbook Solution:

---

Answer:

To determine

a$a$

Total force that resist the motion of car, boat and trailer.

Answer

Total force =910N$=910N$

Explanation

Given:

Mass of car M=1100Kg$M=1100Kg$
Force exerted by car on road Fcar=1900N$F_{car}=1900N$
Acceleration a=0.550ms2$a=0.550\frac{m}{s^2}$

Mass of Boat & Trailer MBT=700Kg$M_{BT}=700Kg$

Formula used:

Using Newton's Second Law of motion,

  Fnet=ma$F_{net}=ma$

Calculation:

Let Resistive force is R
Total mass m =(1100+700)Kg$=(1100+700)Kg$

=1800Kg$=1800Kg$
Driving force by car Fcar=1900N$F_{car}=1900N$

By Applying Newton's Second Law of motion,

Fcar−R=ma$F_{car}-R=ma$

  1900−R=(1800)(0.550)$1900-R=(1800)(0.550)$

  1900−R=9901900−990=R910N=R$\begin{array}{l}1900-R=990\\ 1900-990=R\\ 910N=R\end{array}$

Conclusion:

Total resistive force =910N