2013澳大利亚高考数学试题答案(5)

7 The angular speed of a disc of radius 5 cm is 10 revolutions per minute. What is the speed of a mark on the circumference of the disc? (A) 50 cm min–1 (B)

1

cm min–1 2

(C) 100π cm min–1 (D)

1

cm min–1 4π

8

The base of a solid is the region bounded by the circle x2 + y2= 16. Vertical

Which integral represents the volume of the solid?

(A) 4x2 dx

4

(B) 4π x2 dx

4

(C) 416 x2dx

4

(D) 4π16 x2dx

4

44 4

4

()

()