Since the weight of an object is calculated as the product of its mass times the mass of the Earth divided by the square of the distance between the object being weighed and the center of the Earth, almost no perceivable change will occur. This is because the two masses do not change, and the square of the distance from the Earth's center changes only slightly even in the deepest valley.
The weight of the object would decrease slightly due to the reduction in the gravitational pull at lower altitudes. However, the change would be very small and likely not noticeable.
If the weight of an object is greater than the weight of the water it displaces, the object will sink. This is because the buoyant force exerted by the water on the object is not enough to counteract the object's weight, resulting in it sinking in the water.
For an object to float, it must displace an amount of fluid equal to its weight. This is known as Archimedes' principle. If the weight of the object is less than the weight of the fluid it displaces, the object will float; if the object is denser than the fluid, it will sink.
The object would float in a given liquid.
The object will sink in the fluid.
The object will sink in the fluid.
If the buoyant force is less than the weight of an object placed in a fluid, the object will sink. This is because the force pulling the object down (its weight) is greater than the force pushing it up (buoyant force).
When the buoyant force on an object is greater than the weight of the object, the object will float. This is because the upward force of buoyancy exceeds the downward force of gravity, allowing the object to stay afloat in a fluid.
If the buoyant force equals the object's weight, the object will float at a constant level in the fluid. This is known as neutral buoyancy. The object will neither sink nor rise in the fluid.
Then the object will sink.
Very slightly less than at sea level since if you are on the floor of the valley, you are closer to the centre of the Earth, but the difference would be almost impossible to measure
If the reaction force is less than the weight of an object, the object would begin to accelerate downwards due to the unbalanced force acting on it. This acceleration will continue until a balance between the reaction force and the weight is restored, or until another force acts on the object to counteract the weight.