# Ex 3. A 200kg empty railroad cart
moves east at 15m/s. A 50kg rock is

dropped straight down into the moving

cart. What is the final speed of the

railroad cart?

answered: random7527

16.07.2019 04:10

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

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

answered: robertcoe426

16.07.2019 02:00

Ibelieve the answer you're looking for is

answered: connermichaela

12.07.2019 03:30

Cpowerlifting my boi

answered: arod20061

10.07.2019 07:30

The answer is frictional force

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