A 1/20th scale model of a wing is used to determine forces on the actual wing. The area of the scale model of the wing is .

A. the same as that of the actual wing.
B. 1/20th that of the actual wing.
C. 1/40th that of the actual wing.
D. 1/400th that of the actual wing.
E. 20 times that of the actual wing.

Afoot bridge is made as a simple deck, 4 m long, with a cross section 2 m (wide) and 20 cm thick, and made of wood. the deck is supported at the two ends. the maximum load allowable on the bridge is 10 tons, provided it is uniformly distributed on the deck. to sense this load, a strain gauge is placed at the center of the bridge and its resistance is monitored. if the sensor has a nominal resistance of 350 s2 and a gauge factor of 3.6, what is the reading of the strain gauge at maximum load? the modulus of elasticity for the wood used in the construction is 10 gpa.