Can't figure out Lewis symbol
The Lewis symbol 
would be
b
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If two identical balls have momenta that are equal in magnitude but opposite in direction, what do we know about the speeds of the two balls after the two collide?
a. The speeds of the two balls will always be the same. b. The speeds of the two balls will always be different. c. The speeds with both will be faster than before. d. The ball that was hit first will move faster. e. The ball that was hit first will move more slowly.
A composite beam is made up of a 90 mm 3 160 mm wood beam (Ew 5 11 GPa) and a steel bottom cover plate (90 mm 3 8 mm, Es 5 190 GPa). Allowable stresses in wood and steel are 6.5 MPa and 110 MPa, respectively. The allowable bending moment about the z axis of the composite beam is most nearly:
(A) 2.9 kN?m
(B) 3.5 kN?m
(C) 4.3 kN?m
(D) 9.9 kN?m
Conversion of Units: An oak tree was planted 22 years ago. How many seconds does this correspond to? (Do not take leap days into account.)
A. 6.9 × 108 B. 1.2 × 107 C. 2.9 × 107 D. 2.8 × 108
A carbon dioxide laser emits photons of 10.6 ?m wavelength. How many photons per second are emitted by a 10.0 kW CO2 laser?
a. 
b. 
c. 
d. 
e. 