.Hydrogen bombs get most of their energy from
a. the fission of hydrogen. b. the fusion of hydrogen.
c. strong nuclear energy. d. nuclear binding energy.
b
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Two people sit face to face on nice skateboards that are free to roll without friction. They push each other with a force of 40 N and move apart. Person X, whose mass (including the skateboard) is 50 kg, moves to the left at 3 m/s. Person Z, whose mass (including the skateboard) is 60 kg,
A. moves to the right at 1 m/s. B. moves to the right at 10 m/s. C. moves to the right at 2.5 m/s. D. moves to the right at 4 m/s.
A -6.5-µC point charge is 8.0 cm from a -17-µC charge. What is the electric energy density at the point midway between them? (?0 = 8.85 × 10-12 C2/N ? m2, k = 1/4??0 = 9.0 × 109 N ? m2/C2)
What will be an ideal response?
Ammonia, NImage, is more polar than is borane, BImage because it
A) has a lone pair of electrons. B) is less symmetrical than borane. C) its hydrogens are not exactly opposite one another. D) all of the above
Three point charges, 
and
are located at the vertices of an equilateral triangle of side length 30 cm. What is the potential energy of this arrangement?
A. 0.24 J B. 0.12 J C. -0.24 J D. -0.12 J E. 0