31. What amount of heat energy would be necessary to raise the temperature of 100.0 g of water at room temperature (25^circ C) to the boiling point (100^circ C) ? The specific heat of water is 1.0cal/g^circ C.(1000cal=1kcal) 750 kcal 75 kcal 100 kcal 7.5 kcal

What causes the Moon to revolve around a planet? The Moon's magnetic field The Moon's gravity The Sun's gravity The planet's gravity

What is the light absorbed by a star or galaxy that can be separated into a band of colors called? Frequency Redshift Spectrum Wavelength

5. How did planets form? continuous collisions of matter caused bigger celestial objects to form a supernova explodes sending out a shockwave a nebula or swirling gas and dust exists in space small bits of matter collide together as gravity pull it towards the core

Which moon of Jupiter is the largest? a) 10 b) Europa c) Callisto d) Ganymede

22. White noise is __ a whole bunch of frequencies at the same time a very loud sound a very quiet sound a single frequency at the same time

Which of the following best describes the particles in an atom? Protons carry negative charge Neutrons carry positive charge Neutrons move around a nucleus Electrons move around a nucleus

2. A small block is attached to an ideal spring and is moving in SHM on a horizontal,frictionless surface . When the amplitude of the motion is 0.090 m , it takes the block 2.70 s to travel from to . If the amplitude is doubled, to , how long does it take the block to travel (a ) from to and (b) from to ?

15. How can scientists detect dark energy using evidence? Scientists can see the bending of light due to the gravitational force of matter that cannot otherwise be detected. Scientists have detected dark matter in experiments. Scientists can see dark energy directly through ordinary light waves.

A Secret Door You find a door in your school that you have never seen before. What happens when you open it? square

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