Coffee is poured at a uniform rate at 20 cm3 / s into a cup whose inside is shaped like a truncated cone. if the upper and lower radii of the cup are 4 cm and 2 cm and the height of the cup is 6 cm, how fast will the coffee be rising when the coffee is halfway up (hint: extend the cup downward to form a cone.)

Let the cup is filled to height h after some time

now the total volume of coffee filled in the cup is given as

now volume of the coffee will be

here we know that

now we know that volume flow rate is given as

here y = 3 cm

so water will rise up with speed 0.71 cm/s

it becomes positively charged by charging it

i'm on my way to history not a mistory.