The place the Sun stops its northward motion along the ecliptic is the
A) equator.
B) prime meridian.
C) summer solstice.
D) vernal equinox.
C
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Ellen says that whenever the acceleration is directly proportional to the displacement of an object from its equilibrium position, the motion of the object is simple harmonic motion. Mary says this is true only if the acceleration is opposite in direction to the displacement. Which one, if either, is correct?
A. Ellen, because ?2 is directly proportional to the constant multiplying the displacement and to the mass. B. Ellen, because ?2 is directly proportional to the mass. C. Mary, because ?2 is directly proportional to the constant multiplying the displacement and to the mass. D. Mary, because ?2 is directly proportional to the mass. E. Mary, because the second derivative of an oscillatory function like sin(?t) or cos(?t) is always proportional to the negative of the original function.
A 1.0-kg object moving 9.0 m/s collides with a 2.0-kg object moving 6.0 m/s in a direction that is perpendicular to the initial direction of motion of the 1.0-kg object. The two masses remain together after the collision, and this composite object then collides with and sticks to a 3.0-kg object. After these collisions, the final composite (6.0-kg) object remains at rest. What was the speed of the 3.0-kg object before the collisions?
A. 15 m/s B. 10 m/s C. 5.0 m/s D. 20 m/s E. 25 m/s
The noble (inert) gases all have what similar atomic characteristic?
a. They all have the same atomic number. b. They all have the same quantum number. c. They all have a complete set of electrons in their outer shell. d. They all have a single electron in their outer shell. e. They are all chemically similar to the halogens, which are in the column just before the noble gases in the periodic table.
Hurricanes can be generated
A) in tropical desert areas. B) from tropical storms with high levels of moisture and thermal energy. C) as moist thermal winds cross over the equator. D) by all of these.