Question

Question 8 (1 mark) Attempt 4 ye[0,9 S is the surface y 9(r2+22), ye[0,9] A suitable parametric representation of the surface S is 92 aboute the y-axis for obtained by rotating the functiony= r(s,0) scosi+9sj+ssin@k, 0<<s<1, 0<0<2r O A r(s,0)=scos0i+9s2j+ssin0k, 0<s<1, 0<0<2« B T(s,0)=scos0i+ssinej+9s2k, 0<s<1, 0<0<2« r(s,0)=scosi+ssin@j+9sk, 0<s<1, 0<0<2« D r(s,0)=9si+scos@j+ssin0k, 0 <s<1, 0<0<2T E T(s,0)=9s2i+scosej+ssin0k, 0<s<1, 0<0<2 F G None of these.

Answer 1

option B) is correct

y = 9 (x^2 + z^2)

x = s cos t

z = s sin t

x^2 + z^2 = s^2

y = 9 s^2