In: Civil Engineering

A 100 ft steel tape of cross-sectional area 0.0025 in2, weight 2.0 lb, and standardized at 68°F is 99.983 feet between end marks when supported throughout under a 10-lb pull.

a. What is the true horizontal length of a recorded distance AB if AB was measured to be 140.23 ft? At the time of measurement, the average temperature was 55°F, the tape was unsupported and there was 17 lbs of tension on the tape. (Assume horizontal taping and all full tape lengths except the last.)

A silver wire has a cross sectional area A = 2.0 mm2. A total of
9.4 × 1018 electrons pass through the wire in 3.0 s. The conduction
electron density in silver is 5.8 × 1028 electrons/m3 and e = 1.60
× 10-19 C. What is the drift velocity of these electrons?

. Oil is flowing in a 150 ft long rock with a cross-sectional
area of 35 ft2, and permeability of 100 millidarcies
at a rate of 6 B/D. The pressures at outlet end is 20
psia. Calculate the pressure at the midpoint of the
rock.
Oil viscosity is 5 cp

Copper, brass and steel rods are welded to form a ?. The cross
sectional area of each rod is 2.00 ??2. The free end of
the copper rod is held at 100.0 ° ?; and the free ends of the brass
and steel rods, at 0.0 ° ?. Suppose there is no heat loss from the
sides of the rods, the lengths of which are: copper, 13.0 ??;
brass, 18.0 ??; steel, 24.0 ??. a) What is the temperature of...

A 2750 lb car has a frontal cross-sectional area A of 22.4
ft2, a drag coefficient Cd of 0.28, and a
drive (or tractive) force of 280 lbs. Assume an air density of
2.3x10-3 slug/ft3.
A. Determine the acceleration of the car
when it is driving at 31 mph on a level road.
B. Determine the acceleration of the car when it is
driving at 31 mph on a level road into a 7 mph head wind.
C. Determine the acceleration of the...

2) A steel rod with a cross-sectional area of 0.25 sq. in. is
stretched between two fixed points. The tensile load at 70 degrees
F is 1200 lb. What will be the stress at 0 degrees F? At what
temperature will the stress be zero?
Assume ? = 6.5 x 10-6 °F-1 and E = 30 x
106 psi.

You are measuring a line with a steel tape that has a
standardized length equal to 100.000 feet and a weight of 2.25 lb.
Three full tape lengths and one partial length were used when
making the measurement, resulting in a recorded length of 389.28
ft. The tape was supported at ends only and a pull of 12 pounds was
used. What is the distance after being corrected for sag?
CORRECT ANSWER IS 389.82ft

A 128-lb weight is attached to a spring having a spring constant
of 64 lb/ft. The weight is started in motion with no initial
velocity by displacing it 6 in below the equilibrium position and
by simultaneously applying an external force F(t) = 8sin(4t). a.
Assuming no air resistance, find the equation of motion. b. What is
the long term behavior of the motion? Please use differential
equations to solve this

If the cross-sectional area of the manometer is 10
cm2 and the amount of water added is 50 ml, what will be
the height difference between the two arms of the manometer?

The length of a magnetic circuit of a relay is 25 cm and the
cross-sectional area is 6.25 cm2. The length of the
air-gap in the operated position of the relay is 0.2 mm. Calculate
the magnetomotive force required to produce a flux of 1.25 mWb in
the air gap. The relative permeability of magnetic material at this
flux density is 200. Calculate also the reluctance of the magnetic
circuit when the relay is in the unoperated position, the air-gap...

Let x = boiler steam pressure in 100 lb/ in2 and let y =
critical sheer strength of boiler plate steel joints in tons/ in2.
We have the following data for a series of factory boilers. x 4 5 6
8 10 y 3.4 4.2 6.3 10.9 13.3 (a) Make the logarithmic
transformations x' = log (x) and y' = log (y). Then make a scatter
plot of the (x', y') values. Does a linear equation seem to be a...

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