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Q1. A hot-air balloon is rising straight up with a speed of 1.83 m/s. A ballast bag is released from rest relative to the balloon when it is 7.86 m above the ground. How much time elapses before the ballast bag hits the ground?
Q2. An elastic cord is 64 cm long when a weight of 56 N hangs from it and is 69 cm long when a weight of 83 N hangs from it. What is the "spring" constant of this elastic cord?
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A uniform density cube of mass m, side 2b, and center at C is placed on a fixed horizontal cylinder of radius r and center O in Earth's gravitational field. The cube is originally put so that C is centered above O, but it can roll from side to side w..
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Eight lights are connected in parallel to a 116 V source by two leads of total resistance 1.1. If 240 mA flows through each bulb, what is the resistance of each? What fraction of the total power is wasted in leads.
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The stirrer is used to stir the mixture until it reaches its last equilibrium temperature of 32°C. Analyse the mass of the aluminum cup.
A stone takes 0.28s to travel past a window 2.2m tall. From what height above top of the window did the stone fall?
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