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An electric light bulb is not an ideal resistor. This means that as the filament in the light bulb heats up, its resistance changes. When it is cool, the resistance is the lowest. This means... 
Answered a Question in Science
You must apply Newton's 2nd Law to the book. In the horizontal direction  90 (cos 30)  Ff = ma 77.9  mu*Fn = m*a 77.9  (0.5)*Fn = 20 a You must find Fn from the vertical forces 90 (sin 30) + Fn... 
Answered a Question in Science
In semiconductors, current is often visualized by the flow of electrons or positively charged holes from atom to atom in the material. However, only the electrons are actually free to move. The... 
Answered a Question in Physics
First you need to find the time of flight: y = v_yo t + (1/2) g t^2 0 = (90 sin 45) t + (5) t^2 factor out a t 0 = t (90 sin45 + 5 t) set roots equal to zero t = 0 and 63.6 + 5 t = 0 t = 63.6/5 =... 
Answered a Question in Science
Problem A) The net external force will be found by using Newton's 2nd Law. Net force is equal to mass times acceleration. We know the mass is 2.0 kg, the acceleration must be found using...
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