What is the wavelength of a 0.40 kg object moving at 25 m/s?
A. 0.40 kg objects don't have wavelengths
B. 10 m
C. 0.10 m
D. 
E. 
D.
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Which of the following studies is best suited to astronomical observations that fall into the category called timing?
A) studying how different planets differ in their surface compositions B) studying how a star's brightness varies over a period of 3 years C) measuring the rotation rate of a distant star D) determining the age of the solar system
When a mercury-in-glass thermometer is placed in boiling water, the mercury level falls slightly at first and then begins to rise. Explain this effect. If you have lab time, perform the experiment. Obtain the lab instructor's permission
If we describe the double-slit experiment entirely in terms of electrons instead of in terms of fields, then which of the following is the best description of what one individual electron does in this experiment?
A) It goes through both slits. B) It goes through either one or the other slit, but the observer does not know which one it actually goes through. C) It doesn't go through the slits at all. D) It turns into the tooth fairy. E) It goes through either one or the other slit, and the observer does know which one it actually goes through.
You stand on your skateboard and exert a 50-N push on the wall next to you. If your mass is 60 kg you'll momentarily accelerate from the wall at about
A) 0.08 m/s2. B) 0.8 m/s2. C) 8.0 m/s2. D) none of the above