What's the ampacity of one wire in a cable consisting of three type THW No. 8 copper wires in an ambient temperature of 70^circ C A) 15.0 A B) 18.5 A C) 21.6 A D) 16.5 A

Why does an atom undergo radioactive decay? A The forces in an atom cancel each other out. B The atom collides with another atom. C The nucleus of the atom is unstable. D The atom undergoes a strong reaction.

11. Two polarizers are held so that their polarizations are matched. A student turns one of the polarizers slowly through a complete circle. At how many different locations in the circle is the light completely blocked? 1 4 3 2

The isotropy of the cosmic microwave background radiation (same temperature in all directions) indicates that: the universe had an early period of inflation in which regions initially in contact were carried out of contact with each other. regions that appear to us to be pn opposite sides of the visible universe are in fact in close contact with each other. the universe did not begin to expand significantly until after the era of recombination. the universe has always been dominated by matter.

Select the choice that best completes the following statement. Mechanical energy is created by: a) An object changing its position b) Combustion of an object c) An object already in motion d) A compressed object (D)

Which of the following measurements must be taken with power removed from the wire or component being tested? Current Voltage Amperage Resistance

When there are too many neutrons to protons in the nucleus of an atom describe what happens to the atom. You can start your response with: When the nucleus of an atom has too many neutrons to protons __

The positively charged component of the atom is the 1) electron. 2) neutron. 3) proton. 4) quark.

The planets in our Solar System are thought to have come from: A. clumps of rocky material that exist between the stars B. the same cloud of gas and dust in which the Sun formed C. a cloud of gas in the Orion nebula D. the Sun (they were flung out of the fast-spinning young sun)

Which of the following interactions represents the highest contribution to occupational exposure during a radiographic procedure? Photoelectric absorption Compton scatter Coherent scatter Pair production

Hot Questions

A certain wave function is given by $\psi (x)=\{ \begin{matrix} A&for-a\leqslant x\leqslant a\\ 0&otherwise\end{matrix} $ Which of the following corresponds to the Fourier transform for this wave function? A sum of spherical harmonics. A sum of sines and cosines. A sum of Hankel functions. The Dirac delta function.

8> What is the random capture theory? Which theory best explains how our solar system was created?

Which of the following expressions correspond to the energy-time uncertainty principle? $\Delta E\Delta t\geqslant 2\bar {h}$ $\Delta E\Delta t\geqslant \hat {h}$ $\Delta E\Delta t\geqslant \frac {h}{2}$ $\Delta \omega \Delta t\geqslant \bar {h}$

A wave function can be expanded in basis states as $\vert \psi \rangle =\sum _{n}a_{n}\vert \psi _{n}\rangle $ What must be true of the expansion coefficients? $\sum _{n}\vert a_{n}\vert ^{2}=1$ They must be real numbers. There is no restrictions on the coefficients. $\sum _{n}a_{n}=1$

Match each statement to the wave interaction it describes. \begin{array}{|l|l|} \hline\ reflection\ &\ Waves\ bounce\ off\ an\ object.\ \\ \hline\ absorption\ &\ Waves\ are\ taken\ in\ by\ an\ object.\ \\ \hline\ transmission\ &\ Waves\ bend\ while\ passing\ from\ one\ medium\ to\ another.\ \\ \hline\ diffraction\ &\ Waves\ scatter\ through\ an\ opening\ or\ around\ an\ object.\ \\ \hline\ retraction\ &\ Waves\ go\ through\ an\ object.\ \\ \hline \end{array}

Consider the following force: A fridge magnet is pulling on a paper clip. According to Newton's third law what other force must be happening? The paper clip is pushing on the fridge magnet. The paper clip is pulling on the fridge magnet.

For Newton's third law the action and reaction forces are equal in magnitude and opposite in direction. A True B False

Which one of the following actions will increase the current ratio, all else constant? Assume the current ratio is greater than 1.0

11. ¿Qué es un campo gravitacional? A) Una región donde se experimenta una fuerza eléctrica. B) Una región donde se experimenta una fuerza magnética. C) Una región donde se experimenta una fuerza gravitacional D) Una región sin ninguna fuerza.

Why is a solid less compressible than a gas? Gases have more volume Solids are made of metals Solid particles are tightly packed Solids are heavier