For the E-glass composite material in Problem 12.1, predict the elastic modulus in the direction perpendicular to the fiber axis.
What will be an ideal response?
The isostress modulus is given by Equation 12.13. Take 'a' to be the fibers and 'b' to be the matrix.
In comparison the axial elastic modulus is 52.2 GPa.
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A total lunar eclipse is
a. visible only from the path of totality. b. visible only during a new moon. c. visible to all observers on the side of Earth from which the moon would be visible at that time. d. an opportunity to study the corona of the sun. e. none of the above
Power: The nichrome heating element in an electric drier operates on 240 V and generates heat at the rate of 2.0 kW. The heating element shorts out and, in repairing it, the repairman shortens the nichrome wire by 10%. (Assume the temperature is unchanged. In reality, the resistivity of the wire will depend on its temperature.) What effect will the repair have on the power dissipated in the heating element?
A. The power is still 2.0 kW. B. The power increases to 2.2 kW. C. The power decreases to 1.8 kW. D. None of the given answers is correct.
A particle moves in the xy plane in a circle centered on the origin. At a certain instant the velocity and acceleration of the particle are 
m/s and 
m/s2. What are the x and y coordinates of the particle at this moment?
A. x = 0, y = ?9.0 m B. x = 0, y = +7.2 m C. x = 0, y = +9.0 m D. x = 0, y = ?7.2 m E. x = 6.0 m, y = ?9.0 m
The planet whose orbit lies nearest to the Sun is
a) Mercury. b) Venus. c) Pluto. d) Mars.