Answer:
The total surface area is
57ft^2.
Answer:
No
Step-by-step explanation:
A little trick to easily see if things are divisible by 3 is to add the 2 numbers together.
For example with 71 if you add 7+1 you get 8. 8 is not divisible by 3.
However if you were looking at 81 you add 8+1 to get 9. 3×3=9 so 81 is divisible by 3.
By putting that into a calculator you can see that 81/3=27 and 71/3=23.6666...
Hope that helped!
We need to know how many gallons it can fill a minute first off.
Answer:
4
Step-by-step explanation:
Contact area must be 0.00775 m2, which is the area of a circle with 10 cm in diameter.
<span>Are you surprised that such a small cup is, in theory, enough to hold your weight? But it all comes from the equation of pressure: </span>
<span>P = F / S </span>
<span>P= Pressure, in Pascal, [P] </span>
<span>F = Force, in Newton [N] </span>
<span>S = Surface, in squared meters [S] </span>
<span>Pressure (atmospheric) is 101325 Pascal, and the required force (as per your question) is 80Kg = 785 N. Solving for S, you get 0.00775 m2. </span>
<span>You should have seen these suction cups used by glass workers, where a couple of cups are enough to lift a big piece of glass. This depends on how good the cups are and how smooth the surface of the ceiling or glass is. The idea is to have no pressure inside the cup. If you have some air inside the cup then atmospheric pressure might not be enough to hold 80Kg, as calculated.</span>