a body weighs 400N in water.if the upthrust force is 20n.calculate its weight in air.
Draw the force diagram. What is 400N+20N?
400N
To find the weight of the body in air, we need to understand the concept of upthrust force and the concept of buoyancy.
The upthrust force, also known as buoyant force, is the force exerted by a fluid (in this case, water) on an immersed object. It acts in the upward direction and is equal to the weight of the fluid displaced by the object.
In this scenario, we are given that the upthrust force is 20N. This means that the water is exerting an upward force of 20N on the body.
Therefore, the weight of the body in water would be equal to the difference between its weight in air and the upthrust force.
Let's calculate it:
Weight of the body in air - Upthrust force = Weight of the body in water
Weight of the body in air - 20N = 400N
To find the weight of the body in air, we need to isolate the variable. Adding 20N to both sides of the equation:
Weight of the body in air = 400N + 20N
Weight of the body in air = 420N
Therefore, the weight of the body in air is 420N.
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