# Homework Help: Find velocity

1. Sep 26, 2011

### Physics211

1. The problem statement, all variables and given/known data
The power consumption by a typical house is 1 kW. If the kinetic energy of a car (mass 130 kg) is equal to the total energy used by the house in 1.2 minute, what is the car’s speed?

2. Relevant equations
P=W/t
P=Fv
P:Power

3. The attempt at a solution
I converted 1kW to 1000 Watts and 1.2 minutes to 72 seconds and put it in to the first equation but don't know how to get F for the second equation.

Last edited: Sep 26, 2011
2. Sep 26, 2011

### lewando

Consider:

Energy = Power * time

and

Kinetic Energy = mv2/2

3. Sep 27, 2011

### zgozvrm

Do you mean to say that the power consumed by a typical house is 1 kWh?

4. Sep 27, 2011

### lewando

It is better to say that the house consumes energy at the rate of 1kW. Exactly like the wattage rating on a light bulb. If the house is "on" for 1.2 minutes then you can determine the energy consumed by the house during this interval by:

Energy = Power * time