A car battery does 260 J of work on the charge passing through it as it starts an engine. (a)If the emf of the battery is 12 V, how much charge passes through the battery during the start? (b)If the emf is doubled to 24 V, does the amount of charge passing through the battery increase or decrease? By what factor?
Obama’s DNC Address On behalf of the great state of Illinois... (APPLAUSE) ... crossroads of a nation, land of Lincoln, let me express my deep gratitude for the privilege of addressing this convention. Tonight is a particular honor for me because, let's face it, my presence on this stage is pretty unlikely. My father was a foreign student, born and raised in a small village in Kenya. He grew up herding goats, went to school in a tin- roof shack. His father, my grandfather, was a cook, a domestic servant to the British. OBAMA: But my grandfather had larger dreams for his son. Through hard work and perseverance my father got a scholarship to study in a magical place, America, that's shown as a beacon of freedom and opportunity to so many who had come before him. (APPLAUSE) While studyi