The magnitude of self induced voltage within a winding is directly proportional to the current flow,the winding. and the frequency at which magnetic fields cut through the winding. True False

When a magnetic field moves through a coil of wire, the lines of force of the magnetic field cause the electrons in the wire to flow in a specific direction When the magnetic field moves in the opposite direction, electrons in the wire flow in the opposite direction. True False

A half-wave rectifier can be used to convert ac voltage into dc voltage to continuously charge a capacitor. True False

In ac generators that produce large quantities of electricity, the conductor coils are stationary and the magnetic field revolves within the coils. True False

A waveform image is used to display the level and direction of current, but not voltage. True False

You can prevent a mask from fogging under water by lowering the __ of the water. Temperature Condensation Surface tension Humidity

Which energy change best relates to a boulder that is rolling down the side of a hill? potential energy transforming into kinetic energy mechanical energy transforming into thermal energy potential energy transforming into electromagnetic energy mechanical energy transforming into electromagnetic energy.

A stone is thrown with an initial velocity of 36ft/s from the edge of a bridge that is 49 ft above the ground. The height of this stone above the ground t seconds after it is thrown is f(t)=-16t^2+36t+49 If a second stone is thrown from the ground, then its height above the ground after t seconds is given by g(t)=-16t^2+v_(0)t where v_(0) is the initial velocity of the second stone Determine the value of v_(0) such that the two stones reach the same maximum height. When an object that is thrown upwards reaches its highest point (just before it starts to fall back to the ground), its square will be zero. Therefore to find the maximum height of the object thrown from the bridge,use the square equation, square

3. When an unbalanced force is applied, an object moves. Give an example of this. 4. List Newton's three laws of motion.

Lesson 3 Sound waves travel fastest in __ a) Solids b) Liquids c) Gasses d) None; they travel at the same speed in all states of matter

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