A brass bar weighing 75 pounds is made of 45% zinc and the rest of the bar is copper. how many pounds of copper does the bar contain? Please explain how to solve it?
Assuming the percentages given were by mass and not by volume, all you would need to do is find the percentage of copper and then convert to pounds. Bar 100% - 45% zinc. Which equals 55% copper. To find a percentage multiply 75 pounds x 0.55 pounds of copper (the answer)
Depends on the speed. If you are at high rpm for a particular gear, then letting off the throttle will slow you down the best, because it uses the rear tire the most. But if you are at low rpm for a particular gear already, the engine is not going to do any braking, and you just risk lugging the engine. So when in doubt, throwing in the clutch first is safer.
Follow easygoin's advice on a wet slippery street and you will be one with the pavement in a heartbeat. Stay in higher revs in the wet, let off the throttle, then BCD your way to a stop.
devide 75 by 100, that will give you the weight of each % 75/100 is .75 (3/4ths of a pound) 45% of it is zinc so that would be (45X.75) the rest (100-45) is copper so (55X.75) will be the answer
