No communication is possible across an event horizon
Indicate whether the statement is true or false
TRUE
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If you do work on a skateboard loaded with friends in one-third the usual time, you expend
A) one third as much power. B) the usual power. C) three times the usual power. D) need more information.
When a bimetallic bar of copper and iron strips is heated, the bar bends toward the iron strip because
A) iron gets hotter before copper. B) copper gets hotter before iron. C) copper expands more than iron. D) iron expands more than copper. E) none of the above
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
Jupiter is noticeably oblate because:
A) it has a strong magnetic field. B) it has such powerful gravity. C) it rotates rapidly. D) it undergoes a gravitational attraction from each of its various moons. E) it has a mantle of liquid metallic hydrogen.