Awooden block immersed partially into water. there were 15% of the total volume of the block
exposed and 85% of the total volume immersed in water. calculate a. the density of the wooden block

Density of wooden block is 850 kilogram per cubic meter

Solution:

Given that wooden block immersed partially into water

There were 15% of the total volume of the block  exposed and 85% of the total volume immersed in water

To find: density of the wooden block

The upward force exerted by any fluid upon a body placed in it is called buoyant force

Buoyant force is balanced by weight force of block

Buoyant force is weight of water displaced by block

Buoyant force =

Density of water = = 1000 kg/m3

= volume of block in water = 0.85 V

= Volume of block in air = 0.15 V

Weight of block =

Therefore,

Thus density of wooden block is 850 kilogram per cubic meter

77

step-by-step explanation:

answer: 204

step-by-step explanation:

we are told that the revenue is

x⋅(4080−10x)=−10x^2+4080x

this is a quadratic function, so to maximize it we should find the x-value of its vertex. recall that the x-value of the vertex of the parabola ax^2+bx+c is given by the formula −b/2a.

so in this case, we have a=−10 and b=4080, so the x-value of the vertex is

−b/2a= −(4080)/2(−10)=204