What is the sign of the acceleration of the penny
A student drops a penny from the top of a tower and decides that he will establish a coordinate system in which the direction of the penny's motion is positive. What is the sign of the acceleration of the penny?
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A 100 {rm g} ball on a 60 {rm cm} long string is swung in a vertical circle whose center is 200 {rm cm} above the floor. The string suddenly breaks when it is parallel to the ground and the ball is moving upward. The ball reaches a height 600 {rm
The cable is 5 km long and in order to discover where the short is the technician first measures the resistance between the ends of two wires at one end of the cable and then at another end of the cable. (assume that nothing is connected to the ca
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