1. (2 points) A duck is floating on a lake with 25% of its volume beneath the wa
ID: 2171058 • Letter: 1
Question
1. (2 points) A duck is floating on a lake with 25% of its volume beneath the water. What is the average density of the duck? The density of water is 1000 kg/m^3. (This problem is related to Activity 1 in this lab.) 2. (3 points) A solid block is attached to a spring scale. When the block is suspended in air, the scale reads 20.0N. When it is completely immersed in water, the scale reads 17.7 N. What is (a) the volume and (b) the density of the block? (This problem is related to Activity 2 in this lab.)
Explanation / Answer
average density of water = 1000 kg/m^3
weight of duck = dV * 9.81
= weight of water displaced
= 0.25* V * 1000 * 9.81
dV * 9.81 = 0.25* V * 1000 * 9.81
d= 0.25* 1000
d = 250 kg/m^3
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