Unformatted text preview: PROBLEMS 1 5 P R OILEM 5 Round off the following numbers to three significant (1142' The Specific weight (wt. /V01) of brass is 520 1b/ft3. an s: (a) 4.65735 m, (13) 55578 S. (C) 4555 N: and Determine its density (mass/vol.) in SI units. Use an
i 2763 kg. appropriate prefix. __ Represent 63011 of'the following combinations 0f units 1—13. Convert each of the following to three significant
_ the correct SI fomzusmg an appmpnate preﬁx (41) ”MN, figures: (a) 20 lb  ft to N . m, (b) 4501b/ft3 to kN/m3, and
N/um, (C) MN/ks 4 and (d) kN/ 1113 (c) 15 ft/ h to m/s. 3. Represent each of the following quantities in the 1__14_ The density (mass /volume) of aluminum is . ' ' tSI fprm using an appropriate prefix: (a) 04000431 kg, 5.26 slug/ft3. Determine its density in SI units. Use an
._) 35.3(10 ) N, and (c) 0.00532 km. appropriate preﬁx! .” _ ' Represent each 0f the following combinations 0f eel—15. Water has a density of 1.94 slug/ft3. What is the
l“ 111 the COTIBCI 31 form: (a) Mg/ms, (b) N/mrn, and density expressed in SI units? Express the answer to three
5 mN/ (kg ' #15) significant figures. Represent 63911 0f the following combinations 0f 1—16. Two particles have a mass of 8 kg and 12 kg, .' I I in the correct SI form using an appropriate preﬁx: respectively. If they are 800 mm apart, determine the force
 kN/ “‘54 03) Mg/ mN, and (c) MN/ (kg4 ms). of gravity acting between them. Compare this result with Represent each of the following to three significant the weight 0f each P3111019 .94“ '33 and BXRIESS each answer in SI usnits using an 1—17. Determine the mass in kilograms of an object that
5‘ . oprlate prefix: (a) 45 320 kN, (b) 568(10 )mm, and (c) has a weight of (a) 20 mN, (b) 150 kN, and (c) 60 MN.
7' "' 63 mg. Express the answer to three signiﬁcant figures. 7.. A rocket has a mass of 250003) Slugs _0n earth 1—13. Evaluate each of the following to three signiﬁcant
. " (a) “3 111333 in SI units and 03) Its we1ghtln SI unlts. figures and express each answer in SI units using an
_ the rocket is on the moon, where the acceleration due to appropriate prefix: (a) (200 kN)2, (b) (0005 mm)2, and ﬁr: ‘ty is 3m = 5.30 ft/SZE determine to three significant (c) 400 m)3.
,m es (c) its weight in SI units and (d) its mass in SI units. /
—19 * _ . _ _ _ . Using the base units of the SI system, show that
_ Ifa 031' 13 travellng at 55 1111/11: determlne Its speed 1n Eq. 1—2 is a dimensionally homogeneous equation which
.* 4"" eters per 110111“ and meters per second. gives F in newtons. Determine to three significant figures the gravitational force acting between two spheres that
are touching each other. The mass of each sphere is 200 kg and the radius is 300 mm. _. . The pascal (Pa) is actually a very small unit of
4... me. To show this, convert 1 Pa = 1 N/m2 to lb/ftz.
m ospheric pressure at sea level is 14.7 lb/inz. How many ” ‘4" ' sis thiS? *1—20. Evaluate each of the following to three significant
figures and express each answer in SI units using an appropriate prefix: (a) (0.631 Mm)/ (8.60 kg)2, and
(b) (35 mm)2(48 kg)3. 121. Evaluate (204 mm)(0.00457 kg)/ (34.6 N) to three
significant figures and express the answer in SI units using _ 10. What is the weight in newtons of an object that has a
m. of: (a) 10 kg, (b) 0.5 g, and (c) 4.50 Mg? Express the
. e44 It to three significant figures. Use an appropriate prefix. . 1]. Evaluate each of the following to three significant
. _ es and express each answer in $1 units using _ ,
'_ a appropriate prefix: (a) 354 mg(45 km) / (0.0356 kN), an approprlate prefix.
_ ) (0.004 53 Mg)(201 ms), and (c) 435 MN/23.2 mm. ...
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 Fall '11
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