Question

1. Physics: How does an aircraft carrier that has an average weight of 102,000 tons float on the ocean? Explain your answer.

2. Chemistry: Why does solid water in the form of ice float on liquid water? Explain your answer.  *

3. Integrated: A fresh egg sinks in freshwater and floats in saltwater. Why does this occur? Explain your answer.  *

4. Science Practices: A teacher shows students that a regular Coke can will sink in water but Diet Coke can will float in water. The students are asked to identify the independent and dependent variables. Below is three students’ assessment of the variables, which student do you think correctly identified the variables and why? (Scientific Practices)• Student A: I think the independent variable is the can of regular Coke and the dependent variable is the Diet Coke.• Student B: I would say that the independent variable is the type of soda, either regular or diet, and the dependent variable would be if they sink or float in water. • Student C: I believe that the independent variable is the water and the dependent variable is the type of soda, either regular or diet.  *

Answer 1

1. The aircraft will float on water because it displaces more water due to the design and large size of the hull that is the bottom of the carrier  and hence experience a greater buoyance force than gravitational force and hence will float on water.

2. ice floats on water because it is less dense than water .

3. As the density of fresh water is less than that of egg the egg sinks in fresh water but in case of salt water due to addition of salt its density increases which is more than the density of egg. thus, egg floats on salt water .

4. The regular coke contains a large amount of sweetening agent or sugar which makes it dense than water thus it sinks in water. On the other hand a diet coke contains less amount of sugar or sweetening agent making it less dense than water , thus, it floats on water.

thus statement 3 is correct.