If you rub an inflated balloon against your hair and place the balloon against the wall it will stick to the wall, illustrating
A) Coulomb's law.
B) conduction and insulation.
C) charge polarization.
D) voltage.
Answer: C
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A velocity selector uses a fixed electric field of magnitude E and the magnetic field is varied to select particles of various energies. If a magnetic field of magnitude B is used to select a particle of a certain energy and mass, what magnitude of magnetic field is needed to select a particle of equal mass but twice the energy?
A. 0.50 B B. 1.4 B C. 2.0 B D. 0.71 B E. 1.7 B
Doubling the f-number of a camera lens will change the light intensity admitted to the film by what factor?
a. 1/4 c. 1/2 b. 4 d. 2
How fast is the electron moving in the first Bohr orbit?
a. 3.3 × 10^6 m/s b. 2.2 × 10^6 m/s c. 4.4 × 10^6 m/s d. 5.5 × 10^6 m/s e. 5.5 × 10^15 m/s
A package of supplies is dropped from a plane, and one second later a second package is dropped. Neglecting air resistance, the relative velocity of the 1st package viewed from the second will
A) depend upon their weight. B) be constant. C) increase. D) decrease. E) be zero.