A +5.0-?C point charge is placed at the 0 cm mark of a meter stick and a -4.0-?C charge is placed at the 50 cm mark. What is the net electric field at the 30 cm mark? (k = 1/4??0 = 8.99 × 109 N ? m2/C2 )
A) 4.0 × 105 N/C
B) 5.0 × 105 N/C
C) 9.0 × 105 N/C
D) 1.4 × 106 N/C
D
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Thermosetting polymers are more brittle than thermoplastic polymers, because the long-chain molecules are _____________.
Fill in the blank(s) with the appropriate word(s).
Two flat 4.0 cm × 4.0 cm electrodes carrying equal but opposite charges are spaced 2.0 mm apart with their midpoints opposite each other
Between the electrodes but not near their edges, the electric field strength is 2.5 × 106 N/C. What is the magnitude of the charge on each electrode? (?0 = 8.85 × 10-12 C2/N • m2) A) 35 nC B) 18 nC C) 16 nC D) 30 nC
Iridium is an element that is relatively
A) abundant on Earth, but very rare in meteorites. B) rare on Earth, but very common in meteorites. C) abundant on both the Earth and the Moon. D) rare on both Earth and in meteorites.
A 20-kg object is resting at the top of a table 1.3 m above ground level. The object is then picked up and moved to a height of 7.7 m above ground level. What is the change in the gravitational potential energy of this object?
