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Q. A hydraulic jack is used to lift a load of weight 5000 N. The load-bearing cylinder has a radius of 5 cm, and the other piston has a radius of 1 cm. What force must be exerted on the smaller piston to support the load?

Q. A 75 g ice cube at 0°C is heated until 65 g has become water at 100°C and 10 g has become steam at 100°C. How much energy was added to accomplish the transformation?

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