Question

ttp://i1142.photobucket.com/albums/n608/nancylam67/25.jpg

Answer 1

We need to first find the angle that the hand will move, and from there we can convert to time elapsed

To find the angle: the line along the circumference is given as 40pi
the circumference's total length is 2*pi*r, or 120pi
This means that the clock needs to travel 1/3 the length of the clock, or 120degrees
120 degrees relates to 1/3*12 hours = 4 hours. Therefore, the clock will explode at 10 +4 hours, or at 2:00

Answer 2

40pi=120 degree?

Answer 3

no, 40pi/120pi gives you 1/3 of the circle, which is 120 degrees.

This only happened because we had a radius of 60cm. If it were different, the degree would be different as well.

Answer 4

how u get 120 degree?

Answer 5

40pi along the circumference out of 120pi total
that's 1/3 of the way along the circumference
That means that, out of 360 degrees (one full circle/circumference), we went 1/3 of the way: 1/3*360 = 120

Answer 6

http://i1142.photobucket.com/albums/n608/nancylam67/24.jpg

Answer 7

http://www.flickr.com/photos/62007598 @N03/5643605247/

Answer 8

what tthis for?