Question

9) Two identical strain gages with gage factor 50 and unstrained resistance 350? are fixed on opposite sides of a balloon and connected to the arms of the Wheatstone bridge shown as R1 and R4. The bridge is balanced with resistors R3 and R4 and supplied with 9 V. The balloon is inflated with air and the bridge output is 90 mV. Ey = $2 \times 10^9$ N/m$^2$ a) Find the change in the resistances of the gages; b) Assume that there is no change in temperature. Calculate the stress (pressure) on the wall of the balloon.

          9) Two identical strain gages with gage factor 50 and
unstrained resistance 350? are fixed on opposite sides
of a balloon and connected to the arms of the
Wheatstone bridge shown as R1 and R4. The bridge is
balanced with resistors R3 and R4 and supplied with 9
V. The balloon is inflated with air and the bridge output
is 90 mV. Ey = $2 \times 10^9$ N/m$^2$
a) Find the change in the resistances of the gages;
b) Assume that there is no change in temperature.
Calculate the stress (pressure) on the wall of the balloon.

9) Two identical strain gages with gage factor 50 and
unstrained resistance 350? are fixed on opposite sides
of a balloon and connected to the arms of the
Wheatstone bridge shown as R1 and R4. The bridge is
balanced with resistors R3 and R4 and supplied with 9
V. The balloon is inflated with air and the bridge output
is 90 mV. Ey = 2 × 10^9 N/m^2
a) Find the change in the resistances of the gages;
b) Assume that there is no change in temperature.
Calculate the stress (pressure) on the wall of the balloon.

Added by Amy O.

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