SPH301 Dynamics
6. A string is tied to a 3.2 kg object on a table and a 1.5 kg object hanging over a pulley. The
coefficient of kinetic friction between the 3.2 kg object and the table is 0.30.
a. Calculate the acceleration of each object. (Ans: 1.1 m/s? [R], 1.1 m/s? [Down])
b. Determine the magnitude of the tension in the string. (Ans: 13 N)
c. How far will the objects move in 1.2 s if the initial velocity of the 3.2 kg object is 1.3 m/s
[right]? (Ans: 2.4 m)
3.2 kg
1.5 kg

Ohm's law tells you that i = v/r where v is equivalent voltage and r is equivalent resistance of the circuit
since all circuits have the same voltage, your question is really asking which circuit has the lowest total resistance, since the lower the resistance, the higher the current
circuit a has a resistance of 5 ohms; circuit c is in series so has a resistance of 10 ohms; circuit b is in parallel and therefore has a resistance of 2.5 ohms (review your notes on adding resistances in parallel and series); therefore b has the highest current