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Activity 5 1. Find the total length of the graph of the astroid So HWY: 1+ 4_:( Than A: ;l 78/3 OlX
X3 ‘3 V0
\
u;
l
M 96$
2 _ Q 2 [X J312
9/ —dx  o
: x8+4"x l: 4 V3 (2) o X
12/} ’ . . X973 Tolal lb‘na'l'ln = 4”?) “1‘43, 2. Two electrons repel each other with a force that varies inversely as the
square of the distance between them. One electron is ﬁxed at the point (2,4), Find the work done in moving the second electron from (—'2, 4)
to (1,4). F()(') = 1 ———.___ (ll—x)2 ez ‘
x hex ll 1 d1 2 — J \ elmx).
HEW—M 3 —_
F———o————»—m————g ’ (4—Xj2 _ (d‘x)2
er) ‘2 8I 2
e l
___._.,,*____ , : [ i] V 1 Q l 2 .L
' 4. 44 3 e L 3. (9.) Suppose t = 10, ﬁnd the area of the surface formed by revolv
ing the graph of f(x) = % about the x—axis on the interval [1. t]
and ﬁnd the volume of the solid formed by revolving the region
bounded by f(3) = i and x =1 and :c =t. ‘2
a “I — I ‘ ~+l
L1 "' —? 1+ll1 J x‘f it" i
_1_ 31:1 d'l ' 21! I 1414+: dz
 x 1? .x3 (b) Repeat question (a) for t = 100 Io
{=10 :3 H  2'“ S x4311 d:
l X
r “T — .1 = “I
V ‘ (1 lo) I0.
I00
{:100 ﬂ 9 1= 2'“ j J¥~+I (I;
I at": __
V  “(“7133 Ion (c) Use the information in (a) and (b) to write the volume and the
area as functions of variable 1. (Use V(t) to denote the volume and A(t) to denote the area) (d) Find the limits (if exit) of V(t) and A(t) as t approaches inﬁnity. lion “(1— ) 5 1T M. M, 1
{am ‘l “law I: Note: This shape is called Gabriel’s Horn or Torricelli’s Trumpet,
which can be ﬁlled by 7r cubic units of paint, while you need inﬁnite
number of square units of paint to cover the surface! 4. A torus is formed by revolving the graph of (a: — 2)2 + y2 = 1 about ‘15 yaxis. Find the surface area of the torus. ,2
l_ x2 . «Haﬁz: 4+ (X'Q) (3:,Jl(X‘2)? L1 ,l’(xQ)t J '*(X'2)2 ‘ 1
3.9, 4(x—2)
33 3
’2
Am A = 2<2TI>5 “W“ ' ‘ 0‘"
I Jpn'2)“;
3 ,
= 4“ [X]“ .: 41l(3‘) :
5. Determine the center of mass for the region bounded by y = x3 and ‘
" y=x/§w ' '3
a / <r 5
M=J(,I}_X)dxz[_2xz_&]=_
a 3 t‘ O l?
I 3 l L
NX: jk’l—xl’V‘ )(j—x~x)d)l = l J(x—x)d)<
o ‘L 2 0
7. 9‘
:: 1(2‘. " )5.) = 5
Z 2 *I 0 Es.
\  3/ I"
a 2 x
M3:Sx(«l§«xm\x : g” X”
0 5’ g ‘
= (3“  i) = l
5 5 ° 5 ...
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 Spring '08
 Edgar
 Calculus

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