At the root of the tree of life
A) is the common ancestor of all life on Earth
B) is the common ancestor of all mammals
C) are viruses
D) are human beings
A
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Camera Optics: The focal length of the lens of a simple digital camera is 40 mm, and it is originally focused on a person 25 m away. In what direction must the lens be moved to change the focus of the camera to a person 4.0 m away?
A. It does not make any difference. B. sideways from the CCD sensors C. away from the CCD sensors D. towards the CCD sensors
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 gas in a container expands to three times its volume at constant temperature, the gas pressure
A) is one third. B) is one ninth. C) triples. D) remains the same.
The diameter of a 12-gauge copper wire is 0.081 in. The maximum safe current it can carry (in order to prevent fire danger in building construction) is 20 A
At this current, what is the drift velocity of the electrons? The number of electron carriers in 1.0 cm3 of copper is 8.5 × 1022 and e = 1.60 × 10-19 C. A) 0.044 mm/s B) 0.44 mm/s C) 0.44 cm/s D) 0.44 m/s E) 4.4 cm/s