AP BIOLOGY

BIOCHEMISTRY

PROPERTIES OF WATER

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Imagine a solid object is placed at the bottom of a pool and floats when it is released. The objects floats in water because ____
A
the water’s cohesion creates surface tension
B
the object is more dense than the water
C
the water is more dense than the solid object
D
the water is less dense than the solid object
Explanation: 

Detailed explanation-1: -Archimedes’ principle reasons this statement. This is because the buoyant force acting on the object is less than the weight of the object. If the density of the object is less than or equal to the density of the liquid, then it floats on the surface of the liquid.

Detailed explanation-2: -If an object is more dense than water it will sink when placed in water, and if it is less dense than water it will float.

Detailed explanation-3: -If an object’s average density is less than that of the surrounding fluid, it will float. The reason is that the fluid, having a higher density, contains more mass and hence more weight in the same volume. The buoyant force, which equals the weight of the fluid displaced, is thus greater than the weight of the object.

Detailed explanation-4: -The net upward force on any item in any fluid is known as buoyant force. The object will rise to the surface and float if the buoyant force is higher than its weight. The object will sink if the buoyant force is less than its weight. Buoyancy is a force acting on an item that causes it to rise or move higher.

Detailed explanation-5: -buoyant force is the upward force a fluid exerts on an object. Archimedes’ Principle is the fact that buoyant force is equal to the weight of the displaced fluid.

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