Two point charges of values +3.4 mC and +6.6 mC are separated by 0.20 m. What is the electrical potential at the point midway between the two charges? (ke = 8.99 × 10^9 N×m2/C2)
a. +1.8 × 10^6 V
c. +0.90 × 10^6 V
b. -0.90 × 10^6 V
d. +3.6 × 10^6 V
C
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A) shift in position of nearby stars as the Earth moves around the Sun B) westward motion of a planet with respect to the background stars C) shift in position of nearby stars as the Sun moves about the center of the galaxy D) shift in position of nearby stars as the Earth rotates on its axis
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An iron block of density ?Fe and of volume l3 is immersed in a fluid of density ?fluid. The block hangs from a scale which reads W as the weight. The top of the block is a height h below the surface of the fluid. The correct equation for the reading of the scale is
a. W = (?Fe ? ?fluid)ghl2. b. W = (?fluid ? ?Fe)gl3. c. W = (?Fe ? ?fluid)gl3. d. W = (?Fe + ?fluid)ghl2. e. W = (?Fe + ?fluid)gl3.
What is "Hawking radiation"?
What will be an ideal response?