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Phys 101 learning object sample 1

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A sample learning object on the concept of buoyancy.

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Phys 101 learning object sample 1

  1. 1. Physics 101 Learning Object 1: Buoyancy Multiple Choice Question Two beakers are filled with water to the same level and placed on a weighing scale. The beaker on the left is just filled with water. Q1.The beaker on the right contains a wooden ball that floats on the surface. Which weighing scale reads a greater value: A) Left beaker, B) Right Beaker, C) Both beakers weigh the same (circle one)? Q2. The beaker on the right contains a metal ball that is held partially submerged by a massless string attached to the ceiling. Which weighing scale reads a greater value: A) Left beaker, B) Right Beaker, C) Both beakers weigh the same (circle one)? Page of1 2 Ceiling
  2. 2. Physics 101 Learning Object 1: Buoyancy Multiple Choice Question Q1.The beaker on the right contains a wooden ball that floats on the surface. Which weighing scale reads a greater value: Left beaker, Right Beaker, Both beakers weigh the same (circle one)? Answer: Both beakers weigh the same. Explanation: The most important thing to note in this question is that the wooden ball is floating on the surface of the water. This indicates that the weight of the water displaced by the wooden ball is equivalent to the weight of the ball itself. Given that the water levels are the same in both beakers (there is more water in the left beaker though), the weight of the ball adds to the weight of the water in the right beaker - thus, the total weight of both beakers are the same. The left beaker is full of water and the right beaker holds less water but contains a ball. Q2. The beaker on the right contains a metal ball that is held partially submerged by a massless string attached to the ceiling. Which weighing scale reads a greater value:w Left beaker, Right Beaker, Both beakers weigh the same (circle one)? Answer: Both beakers weigh the same. Explanation: This question actually has the same explanation as the previous question with one notable change: because the metal ball is suspended by the ceiling, its weight is reduced because of the tension in the string. The amount of water displaced by the suspended metal ball contributes to the water level being the same between the left and right beakers. From here on, the explanation is the same as the previous question. Page of2 2 Ceiling TFB Fg FB Fg

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