Which of these is the best explanation of the electric hair that can occur when some people brush their hair?
A) Excess electrons flow onto both the brush and the hair, causing the hairs to repel each other and causing the brush to repel the hairs.
B) The atoms of the brush and hair are set into rapid vibration, causing them to emit electromagnetic waves, which causes the hairs to stand up.
C) Electrons are brushed either from the hair onto the brush, or vice-versa, causing the brush and hair to be charged, so that the hairs then attract each other while the brush repels the hairs.
D) The atoms of the brush and hair are heated, causing their electrons to move faster, which spreads out the atoms and thus causes the hairs to stand up.
E) Electrons are brushed either from the hair onto the brush, or vice-versa, causing the brush and hair to be charged, so that the hairs then repel each other while the brush attracts the hairs.
Question 2
Jack rides a bicycle northward at 12 mph. Jill rides southward on the same road at 12 mph. As they pass each other
A) their speeds are identical and their velocities are identical.
B) their speeds are identical but their velocities are different.
C) their speeds are different but their velocities are identical.
D) their speeds are different and their velocities are different.
E) theoretical physics predicts, surprisingly enough, that they will turn into giant frogs.
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