The law of conservation of strangeness tells us that strangeness is not conserved for which of the following interactions?
a. strong
b. electromagnetic
c. weak
d. All three of the above interactions conserve strangeness.
c
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A box is moved 10 m across a smooth floor by a force F making a downward angle with the floor, so that there is effectively a 4 N force acting parallel to the floor in the direction of motion and a 3 N force acting perpendicular to the floor. The force F acts for 20 seconds. The impulse delivered to the box by the floor during this process has magnitude
A. 60 Ns. B. zero. C. 100 Ns. D. 80 Ns. E. Can't tell without knowing the weight of the box
If a proton has a kinetic energy of 1.000 GeV, what is its speed? 
A. 0.935 c B. 0.875 c C. 0.766 c D. 0.586 c E. 0.343 c
Which of the following correctly lists spectral types in order of decreasing temperature (from hottest to coolest)?
A) MKGFABO B) OBAGFKM C) OBAFGKM D) ABFGKMO E) BAGFKMO
Two blocks with mass m2 > m1 are pulled as shown along horizontal surfaces, each at a constant speed v. Which tension force does more work moving the block a distance D along the surface?