About what temperature does the CMB have at this time?
A. 30 million K
B. 3,000 K
C. 3 trillion K
D. 3 K
E. 3 billion K
Answer: D
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Graphical Addition: If 
+ 
= 
and their magnitudes are given by A + B = C, then the vectors 
and 
are oriented
A. perpendicular relative to one other. B. parallel to each other (in the same direction). C. antiparallel to each other (in opposite directions). D. It is impossible to know from the given information.
What happens to energy in the convection zone of the Sun?
A) Energy slowly leaks outward through the diffusion of photons that repeatedly bounce off ions and electrons. B) Energy is produced in the convection zone by nuclear fusion. C) Energy is transported outward by the rising of hot plasma and the sinking of cooler plasma. D) Energy is consumed in the convection zone by the creation of electrons and positrons. E) Energy is conserved so while the gas moves up and down, there is no net transport of energy.
The laws of refraction and reflection are the same for sound as for light. The speed of sound in air is 340 m/s and in water it is 1510 m/s. If a sound wave approaches a plane water surface at an angle of incidence of 12.0°, what is the angle of refraction?
What will be an ideal response?
Two equal forces are applied to a door. The first force is applied at the midpoint of the door; the second force is applied at the doorknob. Both forces are applied perpendicular to the door. Which force exerts the greater torque?
A) the first at the midpoint B) the second at the doorknob C) both exert equal non-zero torques D) both exert zero torques E) Additional information is needed.