The most characteristic feature of sedimentary rocks is that they are
A) observed in great thicknesses.
B) formed in layered sequences-strata.
C) fossiliferous.
D) made from unconsolidated sediments.
Answer: B
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The surface of the neutron star RXJ2015 has a temperature of 10 million K. This neutron star emits radiation most strongly in
A) x-ray light. B) visible light. C) radio light. D) infrared light.
An object attached to an ideal massless spring is pulled across a frictionless surface. If the spring constant is 45 N/m and the spring is stretched by 0.88 m when the object is accelerating at 2.0 m/s2, what is the mass of the object?
A) 20 kg B) 17 kg C) 22 kg D) 26 kg
Which of these was NOT seen telescopically by Galileo?
A) sunspots B) Venus' phase cycle C) stellar parallax D) four moons around Jupiter E) craters and mare on the Moon
If R = 2.0 k?, C = 4.0 mF, ? = 8.0 V, Q = 20 mC, and I = 3.0 mA, what is the potential difference Vb ? Va?
a.
+7.0 V
b.
+19 V
c.
+9.0 V
d.
?3.0 V
e.
?14 V