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A sample of 400 high school students showed that they spend an average of 70 minutes a day watching television with a standard deviation of 14 minutes. Another sample of 500 college students showed that they spend an average of 55 minutes a day watching t...

A 15 kg mass, tied to the end of a 0.5 m long steel wire, is whirled in a vertical circle. The cross- section of the wire is 0.02 cm2. When the mass is at the bottom of the circle, its angular velocity is 2 rev s i. Find the elongation of the wire at this...

suppose that we are standing on a bridge 30 feet above a river watching a log floating toward we. if the angle with horizontal to the front of the log is 16.7degree and angle with horizontal to the back of the log is 14degree, how long is the log?