When charging two objects by rubbing them together:
a. neither may be a conductor.
b. the heat produced by friction is a necessary part of this process.
c. they must be made of different material.
d. they will sometimes end up with both being positively charged.
C
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Scientific Notation: Write out the number 8.42 × 10-5 in full with a decimal point and correct number of zeros.
A. 0.00000842 B. 0.0000842 C. 0.000842 D. 0.00842
What do the orbits of halo and disk stars tell us about the formation of the Milky Way?
What will be an ideal response?
If a freely-falling object were somehow equipped with a speedometer on a planet where the acceleration due to gravity is 20 m/s2, then its speed reading would increase each second by
A) 10 m/s. B) 20 m/s. C) 30 m/s. D) 40 m/s. E) depends on its initial speed
A pion is an unstable particle that has a mean lifetime of 2.55 × 10-8 s. This is the time interval between its creation in a nuclear process and its extinction into decay products,
as measured in a frame of reference at rest with respect to the pion. An average pion is traveling at 0.230c relative to Earth. How far does it travel in its lifetime, relative to Earth? A) 2.07 m B) 1.81 m C) 2.23 m D) 3.22 m E) 3.50 m