What is the average kinetic energy of an oxygen molecule in a gas with a temperature of 300K?
a. 
b. 
c. 
d. 
e. 
d.
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If the magnetic susceptibility of a material is 5×10-6 that decreases with increase in temperature, this material is _________.
Fill in the blank(s) with the appropriate word(s).
One of the absorption lines of hydrogen has a rest wavelength of 656 nm (at rest means with respect to the observer, like in a lab). You observe several stars and measure the wavelength of this same hydrogen absorption line in each star
Based on the measured wavelength of this line, which star is moving towards the Earth the fastest? A) 670 nm B) 640 nm C) 656 nm D) 630 nm E) 680 nm
A glider on an air track is connected by a spring to the end of the air track. If it is pulled 3.5 cm in the ?x direction away from its equilibrium point and then released from rest at t = 0, what is the initial phase 
?
A. 0
B. 
C. 
D. 
E. 
F. Some other result (specify)
A 0.50-kg mass attached to the end of a string swings in a vertical circle (radius = 2.0 m). When the string is horizontal, the speed of the mass is 8.0 m/s. What is the magnitude of the force of the string on the mass at this position?
a. 16 N b. 17 N c. 21 N d. 11 N e. 25 N