a solid pyramid with a square base with side 12 cm and height 25 cm is made of metal. The metal is melted to form spherical ball
bearings of radius 7 mm. How many pyramids are needed to form 2490 ball bearings?
1 answer:
Answer:
3 pyramids.
Step-by-step explanation:
The volume of one pyramid is 1/3 * b^2 * h
= 1/3 * 12^2 * 25
= 1200 cm^3.
The volume of one ball bearing = 4/3 * π * 0.7^3
= 1.43676 cm^3.
Therefore the volume of 2490 ball bearings = 2490 * 1 .43676
= 3577.53 cm^3.
So we need 3577.53 / 1200 = 2.98 = 3 pyramids.
You might be interested in
Answer:
0.015 miles
Step-by-step explanation:
(-4/5) / 3 =
-4/5 * 1/3 =
-4/15 mile per minute
Answer:
XYZ is similar to ABC
Step-by-step explanation:
take a ruler and measure the sides
Answer:
7, 14, 21, 28, 35
Step-by-step explanation:
brainliest is appreciated
i think the first one but not sure
