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Basically I have been getting a very wrong answer, Don't know if i am approaching this question right. A boy has a 400N force of gravity acting on him as he hangs on the middle of a rope stretched by two poles. the ropes sags in a way that it makes and angle of 170 degrees at the boys hands...

is wi-fi free to use no matter where you are or what the connection source is? i know mcdonalds and starbucks advertise free wi-fi but if im walking through a shopping mall and my phone picks up an open connection source to wi-fi from maybe carphone warehouse or some place is it free to use? I...

i have recently downloaded a few apps such as battery time, sms popup and pingchat for my htc wildfire for free. its now saying there is an update available... is this update free? or is it updating it to the full paid version or something?