it becomes thinner. mass can't be created or destroyed, it only encompasses solids , liquids, and gasses.
The rock will break because it can be stretched no farther. An object stretched beyond its elastic limit may be deformed (adopt a new permanent resting shape) or break.
Higher than what ?? If the object's density is higher than the density of water, then the object sinks in the water.
The density decreases.
When an object is stretched, the force that occurs is known as tension. Tension is a pulling force that acts on the object in the direction of the stretch, attempting to restore the object back to its original shape.
It is halved.
the density will increase because there will be less space
As the speed of an object increases, its density remains constant. Density is a measure of how much mass is contained in a given volume, and it does not change with the object's speed.
When an object is stretched, the intermolecular bonds within the material are pulled apart, causing the object to lengthen. The material stores elastic potential energy as it is stretched, which is released once the stretching force is removed, causing the object to return to its original shape. If the stretching force is too great, the object may deform permanently or break.
To know this you first need to find the density of the object and the density of the fluid on which the the object shall be kept. If the density of the fluid is more than the object's density then the object will float. The object will sink if the reverse happens.
As an object contracts, its volume decreases while its mass remains constant. This results in an increase in the density of the object since density is defined as mass divided by volume.
It floats
Assuming the object is the same straight through - nothing.