03/07/16
Engr 160
Inclass Problem
Name:
1. Determine the number of significant digits for each number shown below.
385.0
278
7.40(10-4)
0.51
2200
3.805(107)
25.5
0.00005
2. Express 2903 ft3 of sulfuric acid in gallons (gal) and also in m3.
3. Convert one square yard to acres and to square meters.
4. Estimate the volume of this classroom in cubic feet and cubic meters. State your
assumptions and any calculations.
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03/07/16
Engr 160
Inclass Problem
Name:
5. A hollow aluminum sphere, 2.60 (102) mm in diameter (outside) with a wall thickness
of 3.10 mm.
a) Compute the outside surface area (mm2).
b) Compute the mass of the ball (kg).
c) Determine whether the ball will float in water (justify your answer).
6. Flow rate over a weir, an obstruction in an open channel over which fluid flows, is
3
2
given by: Q  C 2 g L H 2
3
Where: L = length, m
g = gravitational constant,
m
s2
H = hydraulic head, m
and all remaining parameters are unitless.
Find the units for discharge, Q.
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