A blob of clay, mass M, is propelled upward from a spring that is initially compressed by an amount d. If, upon its release, the clay reaches an ultimate height of h above the unstretched spring’s end, what is the spring constant k?
a. 
b. 
c. 
d. 
b.
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The spectra of most galaxies show redshifts. This means that their spectral lines
A) have wavelengths that are longer than normal. B) always are in the red part of the visible spectrum. C) have wavelengths that are shorter than normal. D) have a higher intensity in the red part of the spectrum.
________'s theories were based on the very accurate observations made by ________
A) Kepler; Tycho Brahe B) Galileo; Kepler C) Kepler; Galileo D) Tycho Brahe; Kepler
What evidence in Mars's atmosphere supports the idea that Mars once had flowing, liquid water?
What will be an ideal response?
A 200-volt battery is connected to a 0.50-microfarad parallel-plate, air-filled capacitor. Now the battery is disconnected, with care taken not to discharge the plates. Some Pyrex glass is then inserted between the plates, completely filling up the space. What is the final potential difference between the plates? (The dielectric constant for Pyrex is ? = 5.6.)