A positively-charged rod is held near an aluminum can that rests on a dry wood table. If you momentarily touch the opposite side of the can with your finger, the can becomes
A) positively charged.
B) negatively charged.
C) partially discharged.
D) completely discharged.
E) none of the above
Answer: B
You might also like to view...
Consider a radioactive substance with a half-life of 10 years. If you start with 1 kilogram of this substance, after 20 years, ________ of the radioactive substance will remain.
A) 0.25 kilogram B) none C) 0.75 kilogram D) 0.5 kilogram
Unpolarized light is passed through polarizer 1 . The light then goes though polarizer 2 with its plane of polarization at 30.0° to that of polarizer 1 . Polarizer 3 is placed after polarizer 2 . Polarizer 3 has its plane of polarization at 30.0° to the plane of polarization of polarizer 2 and at 60.0° to that of polarizer 1 . What fraction of the intensity of the original light gets though
the last polarizer? a. 0.707 c. 0.281 b. 0.125 d. 0.553
As the 21st century began, which of the following is a discovery made by astronomers?
A) The Universe has a center. B) The expansion of the Universe is actually accelerating. C) The Universe has an edge. D) The expansion of the Universe has come to a halt.
An electron moves in a region where the magnetic field is uniform, has a magnitude of 60 ?T, and points in the positive x direction. At t = 0 the electron has a velocity that has an x component of 30 km/s, a y component of 40 km/s, and a z component of zero. What is the radius of the resulting helical path?
a. 4.7 mm b. 18 mm c. 3.8 mm d. 2.8 mm e. 5.7 mm