The rapid fluctuations of quasars show that the energy emitting portions of these objects must be very small
Indicate whether the statement is true or false
T
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When studying the angle of incidence in the refraction process, how must this angle be measured?
The number of ____ in the nucleus determines what element the nucleus is
a. protons b. electrons c. neutrons d. None of these determines the element. e. All of these determine the element.
How do we determine the conditions that existed in the very early universe?
A) We can only guess at the conditions, since we have no way to calculate or observe what they were. B) The conditions in the very early universe must have been much like those found in stars today, so we learn about them by studying stars. C) We work backward from current conditions to calculate what temperatures and densities must have been when the observable universe was much smaller in size. D) We look all the way to the cosmological horizon, where we can see the actual conditions that prevailed all the way back to the first instant of the Big Bang.
A uniform 40-N board supports two children weighing 500 N and 350 N. If the support is at the center of the board and the 500-N child is 1.5 m from its center, how far is the 350-N child from the center?
A) 1.1 m B) 1.5 m C) 2.1 m D) 2.7 m