1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Find velocity

  1. Sep 26, 2011 #1
    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. jcsd
  3. Sep 26, 2011 #2

    lewando

    User Avatar
    Gold Member

    Consider:

    Energy = Power * time

    and

    Kinetic Energy = mv2/2
     
  4. Sep 27, 2011 #3
    Do you mean to say that the power consumed by a typical house is 1 kWh?
     
  5. Sep 27, 2011 #4

    lewando

    User Avatar
    Gold Member

    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
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Find velocity
  1. Find the velocity (Replies: 1)

  2. Finding the Velocity (Replies: 2)

  3. Find the velocity (Replies: 6)

  4. Finding Velocity (Replies: 3)

  5. Finding Velocity (Replies: 14)

Loading...