An experimenter is involved in four of the five tasks below. Select the exception
a. revises a hypothesis as a result of data collected
b. manipulates dependent variables
c. reviews other research results obtained by other scientists
d. examines the effects of independent variables
e. draws conclusions based only on appropriate experimental data
b
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Suppose you are looking at the sky at about midnight on the December solstice. Based on the given right ascensions and declinations, which of the following stars will be nearest to your meridian? Assume you live at a latitude where all the stars on this list rise above your horizon each day. (Hint: Recall that the Sun's celestial coordinates on the December solstice are RA = 18h, dec = -23-1/2°.)
A) Spica: RA = 13hr 25m, dec = -11°09' B) Deneb: RA = 20hr 41m, dec = +45°16' C) Sirius: RA = 6hr 45m, dec = -16°42' D) Alpha Centauri: RA = 14hr 40m, dec = -60°50' E) Vega: RA = 18hr 37m, dec = +38°47'
When sound travels faster near the ground than above, bending of sound tends to be
A) upward. B) downward. C) to the left. D) to the right. E) none of the above
An electron has a kinetic energy that is twice its rest energy. Determine its speed
a. 0.76c b. 0.81c c. 0.94c d. 0.54c e. 0.87c
The speed of light in a certain material is measured to be 2.2 × 108 m/s. What is the index of refraction of this material? (c = 3.0 × 108 m/s)
A) 1.1 B) 1.2 C) 1.4 D) 1.6 E) 1.8