What is the density of a mixture of 90% air 
and 10% helium (density of 0.180 
a. 
b. 
c. 
d. 
e. 
d.
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Galvanized steel is coated with the metal _________.
Fill in the blank(s) with the appropriate word(s).
What evidence do we have of geological activity on asteroids in the past?
What will be an ideal response?
Intensity: A light source radiates 60.0 W of single-wavelength sinusoidal light uniformly in all directions. What is the average intensity of the light from this bulb at a distance of 0.400 m from the bulb?
A. 14.9 W/m2 B. 37.2 W/m2 C. 27.4 W/m2 D. 11.9 W/m2 E. 29.8 W/m2
A CD has a diameter of 12.0 cm. If the CD starts from rest and has a constant angular acceleration of 0.600 
then the total acceleration of a point 3.00 cm from the center of the CD after 1.30 sec is
A. 0.0256 
B. 0.0306
C. 0.0415
D. 0.0472
E. 0.0502