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The question was if speed is doubled, by how much is the kinetic energy changed? I tried to rearrange the formula, but could only get v is directly proportional to the square root of 2K. The answer at the back of the book says the kinetic energy is multiplied by 4 when the speed is multiplied by 2 but I cannot see how. Would you be able to help me with this?     
Gravitational fields - If a force field applies to all objects with mass and a small object in a larger objects field is drawn to it what keeps these objects apart? Does this apply to say my pen and me an object what keeps us apart?     
"The lift in a department store has a mass of 1500 kg and is initially at rest. The lift accelerates downwards at 1.8 m s-2for 0.50 s. It then travels at a constant speed for 8.5 s and is finally brought to rest in a time of 0.50 s. Calculate the unbalanced force (magnitude and direction) acting on the lift as it comes to rest"     
I am having difficulty understanding how the temperature and thickness of a wire affect the resistance. I have been asked to relate these to formulas within this subject like R=V/I.     
In regards to a wheatstone bridge when used in a circuit. Is the bridge only balanced when R1/R2=R3/R4, or does the bridge also become balanced when the voltmeter=0. And if that is the case does it also become balanced when the ammeter becomes=0?     
Why is there a difference, and what is the difference, in terms of current and voltage produced if batteries are place in parallel or in series?     
I don't understand the atomic theory, could you explain it for me?     
What source of 206 Pb if it is formed by alpha emission followed by beta emission? I do not understand the question.     
Can you explain MOSFETs to me in a simple way so I understand how they work?     
Why is a p-type semiconductor any different from an n-type despite it still having a free electron per atom of impurity?     
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