| ssm A father (weight W = 830 N) and his daughter (weight W = 340 N) are spending the day at the lake. They are each sitting on a beach ball that is just submerged beneath the water (see the figure). Concepts: (i) Each ball is in equilibrium, being stationary and having *107. no acceleration. Thus, the net force acting on each ball is zero. What bal- ances the downward-acting weight in each case? (ii) In which case is the buoyant force greater? (iii) In this situation, what determines the magni- tude of the buoyant force? (iv) Which beach ball has the larger radius? Calculations: Ignoring the weight of the air in each ball, and the volumes of their legs that are under the water, find the radius of each ball.

| ssm A father (weight W = 830 N) and his daughter (weight W = 340 N) are spending the day at the lake. They are each sitting on a beach ball that is just submerged beneath the water (see the figure). Concepts: (i) Each ball is in equilibrium, being stationary and having *107. no acceleration. Thus, the net force acting on each ball is zero. What bal- ances the downward-acting weight in each case? (ii) In which case is the buoyant force greater? (iii) In this situation, what determines the magni- tude of the buoyant force? (iv) Which beach ball has the larger radius? Calculations: Ignoring the weight of the air in each ball, and the volumes of their legs that are under the water, find the radius of each ball.

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