15. CORRECTION DUE TO TENSION. A heavy 30-m tape having a cross-sectional area of 0.05 cm² þas been standardized at a of 6) kg. If E=2.10 X 10® kg/cm² tencion calculate the
15. CORRECTION DUE TO TENSION. A heavy 30-m tape having a cross-sectional area of 0.05 cm² þas been standardized at a of 6) kg. If E=2.10 X 10® kg/cm² tencion calculate the
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:15. CORRECTION DUB TO TENSION. A heavy 30-m tape having a
cross-sectional area of 0.05 cm² þas been standardized at a
tencion of 6) kg.
If E=2.10 X 10º kg/cm?
calculate
the
Transcribed Image Text:elongation of the tape for ån increase in tension from 5.5
kg to 20 kg.
16. CORRECTION DUE TO TENSION. A steel tape is 30.0-m long
under a pull of 6.0 kg when supported throughout. It has a
cross-sectional area of 0.035 cm² and is applied fully
supported with a 12-kg pull to measure a line whose re-
corded length is 308.32 m. Determine the correct length of
the line if E=2.1 X 106 kg/cm².
17. CORRECTION DUE TO TENSION. A 30-m steel tape weighing
1.75 kg is of standard length under a pull of 4.55 kg,
supported for full length. This tape was used in measuring
a line (found to be 1371.50 m) on smooth leyel ground under
a steady pul11 of 8 kg. Assuming E=2.05 x 106 kg/cm²and that
the unit we ight of steel is 7.9 Xx 10-3 kg/cm , determine
the following: cross-sectional area of the tape, correction
for increase in tension for the whole length measured, and
the correct length of the measured line.
18. CORRECTION DUE TO SAG. A 30-m steel tape weighs 1.5 kg
is supported at its end points and at the 5 and 15-
and
meter marks. If a pull of 8 kg is applied, determine the
correction due to sag between supports and for one tape
length.
19. CORRECTION DUE TO SAG. A 30-m steel tape weighing 0.04
kg/m
is constantly supported only at its end points, and
used to measure a line with a steady pull of 8.5 kg. If the
measured 1ength of the line is 24 65.18 m, determine the
correct length of the line.
20. NORMAL TENSION. Determine the normal tension required
to make a tape exactly 30.0 m between its ends when used in
an unsupported mode, if the tape has a cross-sectional area
of 0.045 cm² and weighs 0.90 kg. Assume that the tape is
exactly 30.0 m when supported throughout its length under a
standard pull of 6.0 kg, and its modulus of elasticity is
2.10 x 106 kg/cm².
21. NORMAL TENSION. A 30-m steel tape supported at its ends
weighs 0.03 kg/m and is of standard length under a pull of
6.5 kg. If the elastic modulus of stee1 is 2.0 x 10 kg/cm?
and its weight density is 7.9 X 10~³ kg/cm³, determine the
tension at which the effect of sag will be eliminated by
the, elongation of the tape đue to increased tension.
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