Page 627 - SUBSEC October 2017_Neat

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41. A cube of side x cm is submerged in a fluid 43. Which of the following equations is
of density ρ , at a depth h below the surface correct?
of the fluid as shown in the following
diagram. length
(A) Stress = extension

extension
(B) Strain =
length

force
(C) Strain =
area

What is the pressure experienced by the Stress = area
bottom surface of the cube? (D) force

(A) hρg
(B) xρg
(C) (x - h) ρg 44. The equation for the net rate of
(D) (x + h) ρg heat radiation between two bodies is
given as

42. A steel wire of length 3 m and uniform (A) P = σAT4
cross-sectional area 0.1mm is used in
2
an experiment to determine the Young’s (B) P = σA(T - T )
2
1
modulus of steel. The gradient of the force-
extension graph obtained is 6.7 x 10 Nm . (C) P = σA(T - T ) 4
-1
3
1 2
What is Young’s modulus of steel? (D) P = σA ( )
(A) 2.0 x 10 Pa
11
(B) 2.0 x 10 Pa
8
(C) 4.5 x 10 Pa
11
(D) 2.2 x 10 Pa
10

02138010/CAPE 2017