Weekly Weather Report for Luzern, Switzerland. Looking at the weather in Luzern, Switzerland over the next 7 days, the maximum temperature will be 23â (or 73â) on Sunday 9th April at around 1 pm. In the same week the minimum temperature will be -2â (or 28â) on Friday 7th April at around 4 am.
The forces at work in buoyancy. Note that the object is floating because the upward force of buoyancy is equal to the downward force of gravity. In science, buoyancy ( /ËbÉÉª.Énsi, -Éntsi/ or /ËbuËjÉnsi, -jÉntsi/;) or upthrust, is an upward force exerted by a fluid that opposes the weight of an immersed object.
Objects are buoyed up from below because the pressure in a fluid increases with depth, so the force on the bottom of the object is greater than that on the top of it. Archimedes' Principle tells us that the buoyant force is equal to the weight of the fluid displaced by an object. If the weight of the object is greater than the buoyant force (the weight of the displaced fluid), then the object will sink.