1 files changed, 24 insertions, 0 deletions
diff --git a/213/CH10/EX10.18/10_18.sce b/213/CH10/EX10.18/10_18.sce
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index 000000000..32f001d14
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+++ b/213/CH10/EX10.18/10_18.sce
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+//To find power lost in friction
+clc
+//Given:
+D=200/1000,R=D/2 //m
+W=30*1000 //N
+alpha=120/2 //degrees
+mu=0.025
+N=140 //rpm
+//Solution:
+//Calculating the angular speed of the shaft
+omega=2*%pi*N/60 //rad/s
+//Power lost in friction assuming uniform pressure:
+//Calculating the total frictional torque
+T=2/3*mu*W*R*(1/sind(alpha)) //N-m
+//Calculating the power lost in friction
+P1=T*omega //Power lost in friction, W
+//Power lost in friction assuming uniform wear:
+//Calculating the total frictional torque
+T=1/2*mu*W*R*(1/sind(alpha)) //N-m
+//Calculating the power lost in friction
+P2=T*omega //Power lost in friction, W
+//Resluts:
+printf("\n\n Power lost in friction assuming uniform pressure, P = %d W.\n",P1)
+printf(" Power lost in friction assuming uniform wear, P = %.1f W.\n\n",P2)
+\ No newline at end of file