Question

cheops pyramid was built in 2570 BC and became the world's tallest building. It took more than 3,800 years before any taller building was constructed. The pyramid has a height of 148 meters and a side length of about 230 meters. Most of the pyramid's volume consists of massive stone although there is some empty space consisting of burial chambers and passageways. Suppose that 82% of the volume of the pyramid is solid stone and the stone weighs 3kg/dm3.

a) What weighs Cheops pyramid? Give the answer in scientific notation in kilograms. Hint, start by calculating the volume of the pyramid.

Answer 1

@ganeshie8 can u help me?

Answer 2

use the hint,
lets calculate the volume of pyramid first

Answer 3

Volume of pyramid = \(\large \frac{1}{3} (base~area)*(height)\)

Answer 4

Volume of pyramid = \(\large \frac{1}{3} (230*230)*(148)\)

Answer 5

simplify

Answer 6

mmmh 78292003/3?? gives me wrong , im doing it wrong :/

Answer 7

thats right, but we're not done yet ok :)
thats just the volume, we need to find mass still

Answer 8

http://www.wolframalpha.com/input/?i=%28%5Cfrac%7B1%7D%7B3%7D+%28230*230%29*%28148%29%29*3000

Answer 9

try that, pick it from "Scientific notation"

Answer 10

7.8292 x 10^9 ?

Answer 11

right !

Answer 12

thats the mass !

Answer 13

so the volume is : 78292003/3?
and mass: 7.8292 x 10^9 ?

Answer 14

right !

Answer 15

i love u hahahaha thank u!!!

Answer 16

:) ur sweet :3

Answer 17

xoxo<3