Three identical 3.0-µC charges are placed at the vertices of an equilateral triangle that measures 30 cm on a side. What is the magnitude of the electrostatic force exerted on any one of the charges? (k = 1/4??0 = 9.0 × 109 N ? m2/C2 )
A) 1.6 N
B) 1.8 N
C) 2.0 N
D) 2.2 N
E) 2.4 N
A
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A) Eukarya and Archaea B) all three are closely related C) Bacteria and Eukarya D) Bacteria and Archaea
A tennis ball bounces on the floor three times. If each time it loses 22.0% of its energy due to heating, how high does it rise after the third bounce, provided we released it 2.3 m from the floor?
A) 110 cm B) 11 cm C) 110 mm D) 140 cm
Ordinary forces, such as pushes, pulls, normal forces and friction, are considered to be due to the
A) gravitational force. B) electromagnetic force. C) strong nuclear force. D) weak nuclear force. E) contact force.
Which of these did Pierre and Marie Curie discover about radioactivity?
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