Enrico says that positive charge is created when you rub a glass rod with silk, and that negative charge is simply the absence of positive charge. Rosetta says that negative charge is created and that positive charge is the absence of positive charge. (She has heard that Ben Franklin should have reversed the signs he associated with the charges.) Which one, if either, is correct?
a. Enrico, because there really is only one kind of charge.
b. Rosetta, because there really is only one kind of charge.
c. Neither: although no charge is present originally, both types of charge are created through friction.
d. Both: only one type of charge is created by friction at any one time.
e. Neither: both negative and positive charge are present simultaneously in all solid materials on Earth and the process described involves a transfer of charge, not the creation of charge.
e
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Each choice below describes how a few astronomical phenomena are related to time periods. Which list is entirely correct? (Careful: some lists are partially correct.)
A) Earth's rotation defines a day. The saros cycle of eclipses defines a month. Earth's orbit defines a year. Earth's cycle of axis precession takes 26,000 years. B) Earth's rotation defines a day. The cycle of the Moon's phases takes about a month. Earth's orbit defines a year. Earth's cycle of axis precession takes 26,000 years. C) Earth's rotation defines a day. The cycle of the Moon's phases takes about a week. Earth's orbit defines a year. Earth's cycle of axis precession defines a month. D) Earth's rotation defines a day. The Sun's rotation defines a week. The Moon's rotation defines a month. Earth's orbit defines a year.
The closer the observer comes to the event horizon, the slower his watch will appear to run to a distant observer
Indicate whether the statement is true or false
A 1.75-kg picture frame is hung on the wall by means of a string as in the figure (show picture frame with distance between the points of connection on the frame labeled with 37.0cm and vertical displacement of the string as 4.00cm). What is the tension T in the string?
A. 8.6 N B. 40.6 N C. 159 N D. 17.2 N E. 79.4 N
Which of the following objects cannot transit (i.e. pass in front of) the Sun as seen from Jupiter?
a. Mars b. Earth c. Saturn d. Mercury e. Venus