Two point charges of magnitude 4.0 ?C and -4.0 ?C are situated along the x-axis at x1 = 2.0 m and x2 = -2.0 m, respectively. What is the electric potential at the origin of the xy-coordinate system?
A) -36 × 103 V
B) 0 V
C) 36 × 103 V
D) -48 × 103 V
E) 48 × 103 V
B
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Which statement about stellar populations is correct?
a. Population I stars are found in the disk and halo; Population II stars are found in the bulge. b. Population I stars are found in the halo; Population II stars are found in the disk and bulge. c. Population I stars are found in the disk; Population II stars are found in the bulge and halo. d. Population II stars are found in the disk; Population I stars are found in the bulge and halo. e. Population I stars are found in the bulge; Population II stars are found in the disk and halo.
Why is Mercury's magnetic field so weak, relative to Earth's?
A. Mercury's rotation is too slow to generate a strong field. B. Mercury has a solid core that cannot sustain a strong field. C. Mercury has a very small iron core that cannot sustain a strong field. D. Mercury's dayside temperature is too high for a strong field to form.
Although solid matter is mostly empty space, we don't fall through the floor because
A) atoms are constantly vibrating, even at absolute zero. B) of nuclear forces. C) of gravitational forces. D) of electrical forces. E) none of the above
Thermal efficiency (non-Carnot) is
A) Q/T. B) Q/m. C) 1 – Qcold/Qhot. D) Q - W. E) 1 - Tcold/Thot.