A) A 139 kg box is hanging from a string. Find the tension in the string. B) A 160 kg box is hanging from two strings. String #1 pulls up and left, making an angle of 35o with the horizontal on the left, and string #2 pulls up and to the right, making an angle of 40o with the horizontal on the right. FInd the tension in string #2 (on the right side) C) A box is hanging from two strings. String #1 pulls up and left, making an angle of 45o with the horizontal on the left, and string #2 pulls up and to the right with a force of 40 N, making an angle of 75o with the horizontal on the right. FInd the mass of the box.

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Newton's First Law of Motion

If a very smooth ball is rolled down an inclined surface with zero friction, the ball will continue to roll indefinitely for an infinite time, in an attempt to reach to the same height on the opposite hill!