B because it conducts electricity which means it contains a metal hope this helps
O_O how did I get here right now and 4 on the weekend.Does, and I will be in the morning. I have a duck, I will have to do with the help of the bottles. how may be able, I have to do it, and the processed food contain
Yes, the volume of the cylinder will remain constant. As the radius decreases, the height will increase to make sure that the volume is kept the same.
We have been given a value of dr/dt and are required to find dh/dt
Because the volume is constant, we can plug it into the formula for the volume of the cylinder and rearrange it to make h the subject:
128 = πr²h
h = 128/πr²
Now we differentiate both sides:
dh/dr = -256/πr³
Applying the chain rule:
dh/dt = dh/dr x dr/dt
dh/dt = (-256/πr³) x -0.05
dh/dt = 64/5πr³; substituting the value of r
dh/dt = 64/5π(1.5)³
dh/dt = 1.21 in/sec
A)0.0714 a second (7*60)/(30*60)=4.284 4.284/60=0.0714