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Question1
A spark plug in a car has electrodes unconnected by a gap of 0.023 in. To make a spark and ignite the air-fuel mixture in the engine, an electric field of 4.1 106 V/m is required in the gap. (a) What potential difference should be applied to the spark plug to initiate a spark?
Question2
An archer puts a 0.34 kg arrow to the bowstring. A force of 191 N is necessary to draw the string back 1.3 m. Assume that air resistance is negligible.
(a) Assume that all the energy goes into the arrow, with what speed does the arrow leave the bow? m/s
(b) If arrow is shot straight up, how high does it rise?
Question3
The supersonic aircraft Concorde has a length of 61.2 when sitting on the ground on a typical day while the temperature is 12.0. The Concorde is primarily made of aluminium. In flight at twice the speed of sound, friction with the air warms the Concorde's skin and causes the aircraft to lengthen by 27.0. (The passenger cabin is on rollers, so the airplane expands around the passenger cabin.)
Take coefficient of linear expansion for aluminium to be = 2.40×10-5.
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