What is the direction of the electric field vector 
at point P in the situation shown below? (Assume that the balls are actually point particles equidistant from P.)
A. A
B. B
C. C
D. D
E. zero
F. Other
G. AA
H. BB
I. CC
J. DD
C. C
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In a hypernova, a very energetic supernova creates a
A) set of planets to orbit their neutron star host. B) black hole. C) millisecond pulsar. D) very visible supernova remnant. E) white dwarf and its planetary nebula.
The polar caps and dust storms of Mars can be seen with Earth-based telescopes
Indicate whether the statement is true or false
How much air must be pushed downward at 60.0 m/s to keep an 800-kg helicopter aloft?
a. 131 kg/s c. 294 kg/s b. 196 kg/s d. 392 kg/s
A straight wire carries a 12-A current eastward and a second straight wire carries a 14-A current westward. The wires are separated by a distance of 42 cm. The force on a 6.4 m length of one of the wires is
A) 8.0 × 10-7 N. B) 5.1 × 10-4 N. C) 8.0 × 10-5 N. D) 5.1 × 10-6 N. E) not possible to determine with the information given.