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-rwxr-xr-x1271/CH11/EX11.7/7.txt1
-rwxr-xr-x1271/CH11/EX11.7/example11_7.sce9
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diff --git a/1271/CH11/EX11.7/7.txt b/1271/CH11/EX11.7/7.txt
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+Speed of particle is 0.552771 c. \ No newline at end of file
diff --git a/1271/CH11/EX11.7/example11_7.sce b/1271/CH11/EX11.7/example11_7.sce
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+clc
+// Given that
+r = 1.2 // ratio of mass of particle to the rest mass
+// Sample Problem 7 on page no. 11.20
+printf("\n # PROBLEM 7 # \n")
+printf(" Standard formula used \n")
+printf(" m = m_0/((1-v^2/c^2)^1/2) \n ")
+v = 3e8 * sqrt(1 - (1 / r)^2)
+printf("\n Speed of particle is %f c.",v/3e8)