FLUID MECHANICS FUND. (LL)-W/ACCESS
FLUID MECHANICS FUND. (LL)-W/ACCESS
4th Edition
ISBN: 9781266016042
Author: CENGEL
Publisher: MCG CUSTOM
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Textbook Question
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Chapter 1, Problem 23P

What is the weight of a 1-kg substance in N, k N , k g m s 2 , kgf, I b m f t / s 2 , and lbf?

Expert Solution & Answer
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To determine

The weight of a 1kg substance in N, kN, kgm/s2, kgf, lbfft/s2 and lbf.

Answer to Problem 23P

The weight of a 1kg substance in N is 9.81N.

The weight of a 1kg substance in kN is 9.81×103kN.

The weight of a 1kg substance in kgm/s2 is. 9.81kgm/s2.

The weight of a 1kg substance in kgf is 1kgf.

The weight of a 1kg substance in lbfft/s2 is 70.84lbfft/s2.

The weight of a 1kg substance in lbf is 2.2lbf.

Explanation of Solution

Given information:

The mass of the object is 1kg.

Write the expression for weight of the object.

  W=mg...... (I)

Here, the mass of the object is m and the acceleration due to gravity is g.

Calculation:

Substitute 1kg for m and 9.81m/s2 for g in Equation (I).

  W=1kg×9.81m/s2=9.81kgm/ s 2×1N1 kg m/ s 2 =9.81N

Substitute 1kg for m and 9.81m/s2 for g in Equation (I).

  W=1kg×9.81m/s2=9.81kgm/ s 2×1× 10 3kN1 kg m/ s 2 =9.81×103kN

Substitute 1kg for m and 9.81m/s2 for g in Equation (I).

  W=1kg×9.81m/s2=9.81kgm/ s 2=9.81kgm/s2

Substitute 1kg for m and 32.2ft/s2 for g in Equation (I).

  W=1kg×32.2ft/s2=1kg×2.2lbm1kg×32.2ft/s2=70.84lbmft/s2

Substitute 1kg for m and 32.2ft/s2 for g in Equation (I).

  W=1kg×32.2ft/s2=1kg×2.2lbm1kg×32.2ft/s2=70.84lbmft/s2×1lbf32.2lbmft/ s 2=2.2lbf

Since 9.81m/s2 is 1kgf the value of the value of 1kg in kgf will be 1kgf.

Conclusion:

The weight of a 1kg substance in N is 9.81N.

The weight of a 1kg substance in kN is 9.81×103kN.

The weight of a 1kg substance in kgm/s2 is. 9.81kgm/s2.

The weight of a 1kg substance in kgf is 1kgf.

The weight of a 1kg substance in lbfft/s2 is 70.84lbfft/s2.

The weight of a 1kg substance in lbf is 2.2lbf.

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Chapter 1 Solutions

FLUID MECHANICS FUND. (LL)-W/ACCESS

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