If we imagine the history of the universe compressed into one year,with the present as the stroke of midnight at the very end of that year, drosaurs became extinct __ about 6 months ago yesterday morning about 3 weeks ago about an hour ago
An astronaut weighs 638 newtons at the surface of Earth. What is the weight of the astronaut at the surface of the Moon, where the acceleration due to gravity is 1.62 meters per second squared?
Which is the best way to complete the text? Spencer observed that the jar's metal lid was easier to unscrew after it was __ realized the lid loosened up because metal expands when it gets hot. heated and he heated, consequently, he heated.He
1. Spend one day recording a variety of tasks that you do that involve doing work in the scientific sense. Also record the machines that allow you do certain tasks. Then spend the next day doing one or two of these tasks without using the machine. Answer the following questions. a. Was more or less work done using the machine? How do you know? b. Was the power output more or less with the machine? How do you know? c. What are your thoughts about using machines to accomplish work?
2. A tennis player stretches out to reach a ball that is just barely above the ground and successfully 'lobs' it over her opponent's head. The ball is hit with a speed of 16.6m/s at an angle of 62.6 degrees. b. What is the y-component of the initial velocity? [Include units, no spaces. Round to two decimal places. Ex: 4.35m/s]
What is the quark composition of a proton? 1. uud 2. udd 3. csb 4. uds
Which of the following is the best example of a scientific law? The gravitational force between two objects is related mathematically to their mass and the distance between them. If an object is pushed off the edge of a table, it will fall to the ground. Gravitational force is the result of the curvature of the fabric of space-time.
If your sample was smashed into very tiny pieces and you did this same experiment again, would you expect the density to change? Explain your thoughts here. Look up the definition of intensive properties and extensive properties and summarize what you learn here.
When a swimmer lifts their head while in a front position, the feet and legs will sink, causing the swimmer to become more vertical in the water. False True
Power factor is a measurement of how far the current is out-of-phase with the voltage. True False
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
