Which of the following has the greatest number of significant figures?
A) 03.1400
B) 314.1
C) 3.142
D) 000.3140
E) 0.003142
A
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All the following statements about Mars are true. Which one might have led to a significant loss of atmospheric gas to space?
A) The axis tilt of Mars is thought to change significantly with time. B) Mars lost any global magnetic field that it may once have had. C) Outgassed water molecules are split apart, and the oxygen then reacts chemically with surface rock on Mars. D) Mars probably once had a much higher density of greenhouse gases in its atmosphere than it does today.
What keeps Earth moving?
A) Actually, it isn't moving. B) gravity C) the energy of space D) its inertia E) solar energy
Building codes usually limit the current carried by a No. 14 copper wire to 15 A. Many household circuits are wired with this size wire. What is the drift velocity of the electrons in this case?
The diameter of this wire is 1.6 mm. Assume one conduction electron per atom in copper. The atomic weight of copper is 63.3 g/mol and its density is 8900 kg/m3. Avogadro's number is 6.022 × 1023 molecules/mol and e = 1.60 × 10-19 C. A) 5.51 × 10-4 m/s B) 4.56 × 10-4 m/s C) 1.65 × 10-3 m/s D) 4.44 × 10-2 m/s E) 4.89 × 10-5 m/s
The bright blue stars of Orion's Belt are Population I, while our yellow Sun is population II
Indicate whether the statement is true or false