Page 58 - SP015 Past Years PSPM Chapter 6 -14 Ver 2020

PHYSICS PSPM SEM 1 1999 - 2017

PSPM 2013/2014 SF016/2 No. 7(d)

16. F F

material 1 material 2

FIGURE 11.5

FIGURE 11.5 shows an identical force F acting on two identical rods but made of
different materials. What concept will be used to determine which rod will bend more?
Explain your answer. [2 m]

PSPM 2014/2015 SF016/2 No. 7(c)(ii)

11
-2
17. A wire of diameter 0.5 mm has Young’s modulus 2  10 N m . Calculate the strain if
it is extended by 150 N load. [3 m]

PSPM 2015/2016 SF016/2 No. 7(c)

18. A 50 cm wire has Young’s modulus 175 GPa and diameter 0.25 mm. Calculate the
force needed to elongate the wire 1.5 mm. [3 m]

PSPM 2016/2017 SF016/2 No. 7(c)

5
19. A solid cylinder 10 m high and 10 cm in diameter is compressed by a 1  10 kg load.
Calculate the strain energy stored in the cylinder. The Young’s modulus of cylinder is
11
1.9  10 Pa. [4 m]

PSPM 2017/2018 SF016/2 No. 7(d)

20. A 20 cm cylindrical brass rod with diameter 6 cm is held vertically on its one circular
flat end. A load of 5 kg is placed on its upper end. Given the Young’s modulus of brass
-2
10
is 9.1  10 N m , calculate the strain energy of the rod. [4 m]

58