Coal is formed from
A) anthracite.
B) deeply buried oil sediments.
C) swamps.
D) lithified peat.
Answer: D
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The two families of fundamental particles out of which all ordinary matter is made are
A) protons and neutrons. B) leptons and quarks. C) electrons and neutrinos. D) quarks and neutrinos. E) leptons and photons.
5.0 A at 110 V flows in the primary of a transformer. Assuming 100% efficiency, how many amps at 24 V can flow in the secondary?
A) 1.1 A B) 4.6 A C) 5.0 A D) 17 A E) 23 A
A space exploration satellite is orbiting a spherical asteroid whose mass is 4.65 × 1016 kg and whose radius is 39,600 m, at an altitude of 12,400 m above the surface of the asteroid
In order to make a soft landing, Mission Control sends it a signal to fire a short burst of its retro rockets to change its speed to one that will put the satellite in an elliptical orbit with a periapsis (the distance of closest approach, as measured from the center of the asteroid) equal to the radius of the asteroid. What is the speed of the satellite when it reaches the surface of the asteroid? G = 6.67 x 10-11 N•m2/kg2. A) 4.32 m/s B) 6.11 m/s C) 7.18 m/s D) 9.43 m/s E) 5.74 m/s
Daylight hours and night hours are equal in duration throughout the year at the ______________
Fill in the blank(s) with correct word