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spoiler alert (highlight below) Well within a DC generator output, the current is not constant, it changes from 0 to maximum and back to 0 recursively (for a single phase motor) so the output looks like the graph |sin(x)|. Hence, the magnetic flux in the coil will be constantly changing and it...

Powerful. percentage conversion of electrical energy into mechanical energy. and yeh I think the question is a bit difficult because it depends on many factors. Ok new question! The physics syllabus and many people say that direct current CANNOT be stepped up or down. Explain why DC current...

this wouldn't happen because an EMF is induced when an external change in magnetic flux acts through a coil. If the coil is changing flux due to current through it itself, the flux wouldn't cause a consequent emf that opposes the current in the wire because that would result in the current in...

DC motors will be more powerful for a given power supply. Power is the rate at which energy is converted into other forms, and for this application the more powerful motor is the one which converts input electrical energy most efficiently into mechanical energy. AC motors are more inefficient...

can create a warmer/more vintage sound than solid state devices which is an advantage for musicians.

DC motor advantages: - DC motors are used in most household appliances so if DC power transmission was instated, the current would not need to be rectified before being used - Direct current can be used in superconducting wires with 0 heating loss, so the DC motors can be almost 100% efficient...

yeh its the only way. its just a harder question that can't be asked in the HSC anyway.

1. Write out the equilibrium expression 2. We want to replace everything that is not [H+] with either [H+] or a constant 3. We know from standard ionisation that [H+] = [CH3COO-] 4. as 0.5 mol/L of Acetic acid is originally placed in the beaker, and these molecules either stay in their...

If anyone is interested, NBA league pass is free until November 7th, so you can watch all games live online until then.

correctamundo, like srs my above post was a troll.

lol I thought obvious troll was obvious :P 12.7 isnt even acidic lol.

pH = 12.7 ??

how goes the study?

96-7+

I would love a test like 2010. A very perceptive test that was heavily on application of theory.

why is this? is it because 2010-hard, 2011-easier, 2012-hard?

They were measuring the velocity of the earth through the aether, and in doing so the experiment provided a null result as there was no change in the interference pattern of the light. Subsequently this provided experimental evidence that supported Einsteins theory of relativity, as the speed of...

the distance/radius is measured from the centre of mass. In saying "a geostationary orbit is 35800km" this value already takes into account the radius of the earth, as the satellite is 35800km above the dead centre of the earth. In calculation questions they will be more specific as to whether...

left facing eiffel tower. right facing eiffel tower. conjugate hyperbola. Capital O. lower-case o. squiggle.

If the constant variable is distance magnet was moved inwards, just say "we marked out a distance to move the magnet" or something like that.