Estatica Problemas

1–1. Round off the following numbers to three significant

figures: (a) 4.65735 m, (b) 55.578 s, (c) 4555 N, and

(d) 2768 kg.

1–2. Represent each of the following combinations of units

in the correct SI form using an appropriate prefix: (a) ,

(b) N>mm, (c) MN>ks2, and (d) kN>ms.

mMN

1–3. Represent each of the following quantities in the

correct SI form using an appropriate prefix: (a) 0.000431 kg,

(b) 35.3(103) N, and (c) 0.00532 km.

*1–4. Represent each of the following combinations of

units in the correct SI form: (a) , (b) , and

(c) mN>(kg # ms).

Mg>ms N>mm

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1–5. Represent each of the following combinations of

units in the correct SI form using an appropriate prefix:

(a) kN>ms, (b) Mg>mN, and (c) MN>(kg # ms).

1–7. A rocket has a mass of slugs on earth.

Specify (a) its mass in SI units and (b) its weight in SI units.

If the rocket is on the moon, where the acceleration due to

gravity is , determine to three significant

figures (c) its weight in SI units and (d) its mass in SI units.

gm = 5.30 ft>s2

250(103)

*1–8. If a car is traveling at , determine its speed in

kilometers per hour and meters per second.

55 mi>h

1–6. Represent each of the following to three significant

figures and express each answer in SI units using an

appropriate prefix: (a) 45 320 kN, (b) , and (c)

0.005 63 mg.

568(105) mm

FPO

FPO

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Solutions 44918 1/21/09 8:43 AM Page 2

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1–9. The pascal (Pa) is actually a very small unit of

pressure. To show this, convert to .

Atmospheric pressure at sea level is in2. How many

pascals is this?

14.7 lb>

1 Pa = 1 N>m2 lb>ft2

FPO

1–10. What is the weight in newtons of an object that has a

mass of: (a) 10 kg, (b) 0.5 g, and (c) 4.50 Mg? Express the

result to three significant figures. Use an appropriate prefix.

1–11. Evaluate each of the following to three significant

figures and express each answer in Sl units using

an appropriate prefix: (a) 354 mg(45 km) (0.0356 kN),

(b) (0.004 53 Mg)(201 ms), and (c) 435 MN>23.2 mm.

>

*1–12. The specific weight (wt. vol.) of brass is .

D ...