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Problems in Mathematical Analysis.pdf - pwp.net.ipl.pt

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_Answers_45$<br />

y=tx % where t is a parameter. 2340. ~. 2341. n(R + r) (/? + 2r); 6n 2 for<br />

R r H<strong>in</strong>t. The equation of an epicycloid is of the form x = (R -f r) cos f<br />

~rcos^JL. r<br />

*, y = (/?-f-r)s<strong>in</strong>/ rs<strong>in</strong>^J^/, where / is the angle<br />

of turn of<br />

the radius of a stationary circle drawn to the po<strong>in</strong>t of tangency.<br />

2342. Ji(/? r)(# 2r), ~ nR 2<br />

for '=-7- H<strong>in</strong>t. The equation of the hypo-<br />

cycloid is obta<strong>in</strong>ed from the equation of the correspond<strong>in</strong>g epicycloid (see<br />

Problem 2341) by replac<strong>in</strong>g r by r 2343. FR. 2344. mg(z, z 2).<br />

2<br />

2345.<br />

-^-(a<br />

6 2<br />

), where k is a proportionality factor, 2346. a) Potential,<br />

V mgz, work, mg(z l 2 2); b) potential,<br />

c) potential,<br />

2348.<br />

2353.<br />

/ = L(jc + + *) f work, 4r (# 2<br />

!<br />

/J*"<br />

10 ^<br />

(5 V 51)<br />

/ = -ii-, work, -<br />

r 2<br />

). 2347. -|jta*.<br />

a. 2354. ^ /i*. 2355. a) 0; b) - { ( (cos a + cos p<br />

J<br />

j<br />

. 2356. 0. 2357. 4;i. 2358. na\ 2359. a*. 2360. =<br />

(V)<br />

2365. 3a 4 2366. -^ . 2367. ~ Jia 5 . 2363. 2371. Spheres; cyl<strong>in</strong>ders.<br />

2 O 2<br />

2372. Cones. 2373. Circles, x 2 + / = c 2<br />

, z = c 2 . 2376. grad (/ (>1)=9/ 3y 3Jfe;<br />

* = xy\ x = y = z. 2377. a) ~; b) 2r c) ~ ;<br />

d) /'(/) 2378. grad(rr) = c; the level surfaces are planes perpendicular to<br />

the vector c. 2379. 5^ = 7^, 57 = lgrad(y| when a = 6 = c. 2380. ~ =<br />

=--- COS<br />

(<br />

f / >r) ; ^=0<br />

for IJ_r. 2382.-?-. 2383. div a = ^ / (r) + /' (r).<br />

.<br />

2385. a) divr=3, rotr=0; b) div(r^)-=~, rot (/r) = -^--<br />

; c) div<br />

= LW(Ct r) t rot (/(r)

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