The age of our solar system is approximately
A) 10,000 years.
B) 3.8 million years.
C) 4.6 million years.
D) 4.6 billion years.
E) 14 billion years.
D
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Explain how radioactive dating works, and why it works only with igneous rocks
What will be an ideal response?
A Type II supernova can form a _______________ or a black hole
a. neutron star b. red giant c. white dwarf d. planet
Four long wires are perpendicular to the x-y plane. Each wire carries the same magnitude current. Wire 1 goes through point (a, a, 0) on the x-y plane, wire 2 goes through the point (–a, a, 0), wire 3 goes through the point (–a, –a, 0), and wire 4 goes through the point (a, –a, 0). Wires 1 and 3 carry their currents in the positive z direction and wires 2 and 4 carry their currents in the
–z direction. What is the direction of the resulting magnetic field at the origin? a. in the +x direction b. in the –y direction c. in the –x direction d. There is no direction since the field is zero at this point.
Ekapluto is an unknown planet that has two spherical moons in circular orbits. The table summarizes the hypothetical data about the moons. Both moons have low axial spin rates. (G = 6.67 × 10-11 N ? m2/kg2)
Mass Radius Orbital radius Orbital period Moon A 4.0 × 1020 kg 2.0 × 108 m 4.0 × 106 s Moon B 1.5 × 1020 kg 2.0 × 105 m 3.0 × 108 m The acceleration due to gravity at the surface of Moon B is A) 0.10 m/s2. B) 0.15 m/s2. C) 0.20 m/s2. D) 0.25 m/s2. E) 0.30 m/s2.