Do you know the answer?????

[zibb3r]

1) The cross sectional area of a metal beam used in skyscraper production is 153 cm² and the length of the beam is 3m.  What volume of metal is required to produce the beam???

a)459cm³
b)4590cm³
c)45900cm³
d)459m³
e)45900m³


2 and 3) A cylindrical drum has the following properties:
-a thickness of 2cm
-a total diameter of 52cm (including the 2cm thickness)
-a height of 27cm

Find the surface area of the outside curved surface:

a)324cm²
b)509cm²
c)1018cm²
d)3053cm²
e)12215cm²

Calculate the volume that could fill the inside of the drum:

a)1357cm³
b)2120cm³
c)3054cm³
d)5429cm³
e)8482cm³



Thanksyou so much!!!!!!!!!!

[paulsterio]

1) - Volume = C/S Area x Length = 153cm x 3m = 153cm x 300cm = 45900cm3 = C

2) - TSA Of a Cylinder = 2(pi)(r)(h+r) = 2 x 3.14159 x (52/2) x (27 + 52/2) = 8654cm2 (which isnt there - can someone shed some light on this)?

[REBORN]

It says the outside curved surface...not the whole TSA?

[paulsterio]

It says the outside curved surface...not the whole TSA?

Good point, in that case

A = 2(pi)(r)(h) will give the answer

A = 2 x 3.14159 x 52/2 x 27

[Kiro Kompiro]

It says the outside curved surface...not the whole TSA?

Good point, in that case

A = 2(pi)(r)(h) will give the answer

A = 2 x 3.14159 x 52/2 x 27

=4410.8 cm squared which is not there?

[Kiro Kompiro]

volume that will fill is the volume of the inner cylinder,  diameter is 52-2=50, radius is 25 cm

volume = pi*r*r*h
=3.14159*25*25*27
=53014 cm cubed which is not an answer?