Posted by **Yulia** on Monday, August 24, 2009 at 8:04pm.

What is the volume in cubic cm of a sphere with radius 2 cm?

is it =

33.51032163829112

What is the area in m2 of a triangle with base 2.8 m and height of 10.4 m?

is it =

14.56

A sphere has a volume of 106 cm3. What is its radius (in cm)?

is it =

101.8112097952136

that doesnt look right :/

- Physics -
**bobpursley**, Monday, August 24, 2009 at 8:12pm
yes. Unless you have to worry about significant digits.

yes, but I wonder if you should be paying attention to sig digits.

No.

radius=cuberoot (3*volume/(4PI))

- Physics -
**drwls**, Monday, August 24, 2009 at 8:14pm
The first two are OK. For the third question, use

R^3 = [3/(4 pi)]*V

and then take the cube root

- Physics -
**bobpursley**, Monday, August 24, 2009 at 8:15pm
To get cube root on a calculator, use the y^{x} key

as

NUMBER y^{x} (1/3) =

That give you the cube root of NUMBER

- Physics -
**Yulia**, Monday, August 24, 2009 at 8:19pm
Yes, I do have to be paying attention to sig figs, just for this chapter though

and for the third one, is it 6.297560287884612?

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