Two separate pairs of binary stars are observed. The separation of the pairs is identical, but the orbital period of Pair X is 4 times the orbital period of Pair Y
How does the total mass of the stars in Pair X compare to the total mass of the stars in Pair Y?
A) Pair X has a total mass 2 times greater than Pair Y.
B) Pair Y has a total mass 2 times greater than Pair X.
C) Pair Y has a total mass 16 times greater than Pair X.
D) Pair X has a total mass 16 times greater than Pair Y.
C
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If a lens is submerged in water, what happens to its focal length?
A) It decreases. B) It stays the same. C) It becomes negative. D) It increases.
In a Compton scattering experiment, the scattered photon has a wavelength of 6.55 pm. If the scattering angle is 
what is the energy of the incident photon?
A. 1.43 MeV B. 218 keV C. 380 keV D. 117 keV E. 66.3 keV
To determine the thermal conductivity of a structural material, a large 15 cm-thick slab of the material was subjected to a uniform heat flux of 2500 W/m2 , while thermocouples embedded in the wall 2.5 cm. intervals are read over a period of time. After the system had reached equilibrium, an operator recorded the thermocouple readings shown below for two different environmental conditions
From these data, determine an approximate expression for the thermal conductivity as a
function of temperature between 40 and 208°C.
GIVEN
Thermal conductivity test on a large, 6-in.-thick slab
Thermocouples are embedded in the wall 2 in. apart
Heat flux (q/A) = 2500 W/m2
Two equilibrium conditions were recorded (shown above)
FIND
An approximate expression for thermal conductivity as a function of temperature between 40 and
2080C
ASSUMPTIONS
One dimensional conduction
SKETCH
Constant Acceleration Kinematics: A car increases its forward velocity uniformly from 40 m/s to 80 m/s while traveling a distance of 200 m. What is its acceleration during this time?
A. 8.0 m/s2 B. 9.6 m/s2 C. 12 m/s2 D. 24 m/s2