A +5.0-µC point charge is 12 cm from a -5.0-µC point charge
What is the magnitude of the electric field they produce at the point on the line connecting them where their electric potential (relative to infinity) is zero? (k = 1/4??0 = 9.0 × 109 N ? m2/C2 )
A) 0 N/C
B) 12.5 MN/C
C) 0.75 MN/C
D) 25 MN/C
E) 1.5 MN/C
D
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A. It is energy released as matter is funneled into a black hole. B. It is gas evaporating from an accretion disk around a massive black hole. C. It is shot out of a black hole. D. It is material trapped between two orbiting black holes being gravitationally scattered. E. It is a rip in space-time from which Hawking radiation is released.
Perhaps the most fundamental role that enzymes play in living cells is
A) attacking foreign bodies like bacteria and viruses B) carrying oxygen across cell membranes C) facilitating the replication of DNA and the reading of the genetic code D) the breaking down of more complex molecules
A bucket in an old well is hoisted upward by a rope which winds up on a cylinder having a radius of 0.050 m. How many rev/s must the cylinder turn if the bucket is raised at a speed of 0.20 m/s?
a. 3.0 rev/s c. 0.48 rev/s b. 1.5 rev/s d. 0.64 rev/s
A hot object that is glowing orange will become redder as it cools
a. True b. False Indicate whether the statement is true or false