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In the following problems highlight the key words that give information about the physics concept needed to solve the problem. List those concepts under the problem. Do not solve the problems. 1. A wrecking ball is hanging at rest from a crane when sudden the ball to fall halfway to the ground is 4.77 s. Find the time it takes for the ball to fall from rest all way to the ground. ly the cable breaks. The time it takes for the 2. A wind turbine is initially spinning at a constant angular speed. As the winds strength gradually increases, the turbine experiences a constant angular acceleration 0.166 rad/s. After making 2870 revolutions, its angular speed is 121 rad/s. (a) What is the initial angular velocity of the turbine? (b) How much time elapses while the turbine is speeding up? 3. A cylindrical brass rod (cross-sectional area 1.57 x 10 m2) hangs vertically straight down from a ceiling. When a 756-N block is hung from the lower end of the rod, the rod stretches. The rod is then cooled such that it contracts to its original length. By how many degrees must the temperature be lowered?
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①网Rest, cau-ble b/uafes, tine tafes, Halfway , All the Ch ouat ana, teeratun e owend

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