Kamir and Alexis are studying the properties of water. They conducted a variety of experiments to determine its physical and che
2 answers:
Answer: D) Neutral water react s with carbon dioxide to form an acid solution.
Explanation: A physical property is defined as the property in which a change in shape, size takes place. No new substance gets formed while measuring physical properties.
Example: A) Salt dissolves in water.
B) Oil and water do not mix.
C) Pencil shavings float on water and do not dissolve.
A chemical property is defined as the property in which a change in chemical composition takes place. A new substance is formed while measuring chemical properties.
Example: D) Neutral water react s with carbon dioxide to form an acid solution.
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Answer:
69.74 N
Explanation:
We are given that
Weight of sled=49 N
Coefficient of kinetic friction
Weight of person=585 N
Total weight==mg=49+585=634 N
We know that
Force needed to pull the sled across the snow at constant speed,F=Kinetic friction
Where N= Normal=mg
Hence, the force is needed to pull the sled across the snow at constant speed=69.74 N