The radius of a semi-circle is growing at 2cm/s. At what rate is the Area changing when radius is 5 cm? A specific tube of ice can be approximated by a cylinder with a height equal to it's radius. If the ice is melting at a rate of 487 cm3/min then find how the radius is changing when the volume is 8T cm3. In an electrical circuit the voltage V (in volts) is equal to the Current I (in amps) times the Resistance R (in ohms): V=IR. In a particular circuit, the current as a function of time is I(t) = 12 +3t and the Resistance as a function of time is R(t) = V3t . Find how the voltage is changing with respect to time at the 3 second mark. swers