Which statement is true about nuclear fusion? It is caused by the same process that causes nuclear fission. It does not occur naturally in the solar system. It has very low activation energy It produces nearly all the elements that are heavier than helium
7. Just before the motorcycle stops, square the handlebars so the motorcycle: A. Will not roll backwards B. Can be more easily held up C. Has more traction D. Controls will be easier to use
The direction of magnetic : field lines can be found using the __ Left-hand I grip method Gun fingers method Thumbs down method Right-hand grip method
Question 10 of 10 In which reaction is there a transformation of mass into energy? A. Calcium oxide combines with water to form calcium hydroxide. B. Sodium combines with chlorine to form sodium chloride. C. Two hydrogen atoms fuse to form a helium atom. D. Ammonium nitrate breaks down into dinitrogen monoxide and water.
A coin is thrown straight downward from the top of a building and travels -150m The final velocity of coin when it reaches the ground is -80.0m/s What was the initial velocity of the coin if we ignore air resistance? v_(i)=[?]m/s
Newton's 3rd law states that for every action there is a (an) __ and __ reaction. large, opposing equal, opposite unbalanced, perpendicular inertial, continual
The greater the distance over which the wind blows __ the smaller the waves the larger the waves
Select the reasons why most professional telescopes are reflectors rather than refractors. It is easier to make a large reflecting telescope than a large refracting telescope. Reflecting telescopes have shorter focal lengths than refracting telescopes. Only the front surface of a mirror has to have a precise shape. Mirrors allow for chromatic aberration. A reflector can collect more light than a refractor. A lens has to be supported only around its edges.
2. Observe: Move all of the sliders to 50 dB. Click Play full sequence (20 sec)What do you notice about the perceived volumes of the tones? square
The bulk of the universe is composed of __ atoms. A oxygen B helium C nitrogen D hydrogen
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
