+0  
 
0
946
2
avatar+105 

I can do the first bit but I'm a little stuck on the second bit.   

 

 Oct 27, 2014

Best Answer 

 #1
avatar+33266 
+10

V =(4/3)pi.r3

dV/dt = 4.pi.r2.dr/dt so

dr/dt = -10-4

r = r0 - 10-4t

where (4/3)pi.r03 = 10-6 m3

r0 = 3√(3*10-6/4pi) m

 

We want the time when r = 0:

t = r0/10-4

(the units of 10-4 aren't given!).

.

 Oct 27, 2014
 #1
avatar+33266 
+10
Best Answer

V =(4/3)pi.r3

dV/dt = 4.pi.r2.dr/dt so

dr/dt = -10-4

r = r0 - 10-4t

where (4/3)pi.r03 = 10-6 m3

r0 = 3√(3*10-6/4pi) m

 

We want the time when r = 0:

t = r0/10-4

(the units of 10-4 aren't given!).

.

Alan Oct 27, 2014
 #2
avatar+105 
0

Thank you Alan. 

 Oct 28, 2014

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