Exercise 2. Two forces are acting on a point. One force is (2sqrt (2))/(sqrt (6)+sqrt (2)) Newtons and the other is (2sqrt (3))/(sqrt (6)+sqrt (2)) Newtons. The angle 105cos((2sqrt (2))/(sqrt (6)+sqrt (2)))+105cos((2sqrt (3))/(sqrt (6)+sqrt (6))),105sin((sqrt (2))/(sqrt (6)+sqrt (2)))+105sin(frac (sqrt (3)){sqrt {

Multiple Answer 1 point Based on the presently available data, please select all of the following that apply as significant threats to the development of intelligent life on a planet: High energy radiation generated as a supermassive black hole accretes large amounts of mass Alien invasions Alow mass star reaching the end of its life before life has had time to develop D Collisions with dark matter clouds Supernovae explosions of high mass stars Cometary impacts on the planet's surface

Use the correct key term to complete each of the following sentences. 1. Amplitude measures the __ of a wave. 2. When frequency increases, the length of the wavelength __ 3. A wave's energy is __ related to its frequency.

8. Rahim heated some leftovers in a microwave oven. He noticed that although the food got hot the inside of the microwave oven did not. This happens because __ f. the walls of the microwave oven are good heat insulators g. there is no air in a microwave oven h. the fan in the microwave oven keeps it cool j. microwaves heat by interacting with water molccules

When sunlight is absorbed by semiconducting materials, the __ knock __ loose from their atoms, causing the electrons to flow through the material to produce electricity. Select one: a. Electrons; photons b. Neutrons; electrons c. Electrons; neutrons d. Photons; electrons

1. If you are pushing a car with a force of 24000 Nover a distance of 250 m. how much work will you do?

13) Which statements below are TRUE about beats? CHECK ALL THAT APPLY. piano tuners use beats to tune pianos they are repeated changes in loudness the two sounds must be close in frequency the two sound waves interfere constructively at regular intervals the two sound waves interfere destructively at regular intervals two notes are in tune if no beat can be heard when they are played together

The breakup of a larger nucleus into two or more smaller nuclei is square

Water has a low specific heat and changes temperature easily, which keeps land near large bodies of water cooler in the summer months and warmer in the winter months. True False

What happens to the magnetic field of an electromagnet when the current is turned off? a The magnetic field remains the same b The magnetic field essentially disappears c The magnetic field changes direction d The magnetic field becomes stronger

Hot Questions

Which of the following describe the expansion coefficients for a general state? $a_{n}=\langle \psi _{n}\vert \psi \rangle =\int _{-\infty }^{\infty }dx\psi _{n}^{\ast }(x)\psi (x)$ $a_{n}=(\sum _{n}\vert \psi _{n}\rangle )\vert \psi \rangle $ $a_{n}=\langle \psi _{n}\vert \psi \rangle ^{\ast }=\int _{-\infty }^{\infty }dx\psi _{n}(x)\psi ^{\ast }(x)$ $a_{n}=\langle \psi _{n}\vert \psi _{m}\rangle =\int _{-\infty }^{\infty }dx\psi _{n}^{\ast }(x)\psi _{m}(x)$

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?

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}

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

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.

Which of the following correspond to the first-order shift in energies using time-independent perturbation theory? $\vert \langle \psi _{n}^{0}\vert \delta \hat {H}\vert \psi _{n}^{0}\rangle \vert ^{2}$ $\langle \psi _{n}^{0}\vert \delta \hat {H}\vert \psi _{n}^{0}\rangle $ $\sum _{m\neq n}\frac {\langle \psi _{n}^{0}\vert \delta \hat {H}\vert \psi _{n}^{0}\rangle }{E_{m}^{0}-E_$ $\sum _{m\neq n}\frac {\vert \langle \psi _{m}^{o}\vert \delta \hat {H}\vert \psi _{n}^{o})\vert ^{2}}{E_{m}^$

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

If a wave function is given in terms of orthonormal wave functions as $\vert \psi \rangle =\frac {1}{\sqrt {5}}\vert \psi _{1}\rangle +\sqrt {\frac {3}{5}}\vert \psi _{2}\rangle +A\vert \psi _{3}\rangle $ Then what must be true about A? $\frac {1}{\sqrt {5}}$ $\frac {1}{2}$ There is not enough information to determine A. $\frac {1}{5}$