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Question :
11. How large a force necessary to stretch a 2.0-mm-diameter : 2102185

11. How large a force is necessary to stretch a 2.0-mm-diameter steel wire (*Y* = 2.0 ´ 10^{11} N/m^{2}) by 1.0%?

A. 3.1 ´ 10^{3} N

B. 6.3 ´ 10^{3} N

C. 9.4 ´ 10^{3} N

D. 1.3 ´ 10^{4} N

12. The standard kilogram is a platinum-iridium cylinder 39.0 mm in height and 39.0 mm in diameter. What is the density of the material?

A. 21.5 g/cm^{3}

B. 19.3 g/cm^{3}

C. 13.6 g/cm^{3}

D. 10.7 g/cm^{3}

13. The quantity "pressure" expressed in terms of the fundamental quantities (mass, length, time) is equivalent to:

A. MLT^{-1}.

B. ML^{-1}T^{-2}.

C. M^{2}L^{-1}T^{-3}.

D. a dimensionless quantity.

14. The pressure inside a commercial airliner is maintained at 1.00 atm (10^{5} Pa). What is the net outward force exerted on a 1.0 m ´ 2.0 m cabin door if the outside pressure is 0.30 atm?

A. 140 N

B. 1 400 N

C. 14 000 N

D. 140 000 N

15. A stonecutter's chisel has an edge area of 0.50 cm^{2}. If the chisel is struck with a force of 45 N, what is the pressure exerted on the stone?

A. 9 000 Pa

B. 90 000 Pa

C. 450 000 Pa

D. 900 000 Pa