Recent content by mbm

  1. M

    Why is 220V circuits used in certain devices

    Thnx SammyS! just needed a little more info!
  2. M

    Why is 220V circuits used in certain devices

    Homework Statement Why 220-V circuits used for such devices as electric clothes dryers and stoves? What differences do you expect to find in the wire used for these circuits compare to 120-V lines? Homework Equations The Attempt at a Solution clueless
  3. M

    Calculating Natural Gas Requirements for a 1000MW Power Plant

    the bbl/day quantity is a fuel requirement for a 1000MW power plant I was giving the problem some thought, the 1000MW can be converted to SCF/year and afterwards use the equation efficiency= output/input to obtain the input in SCF/year instead of using the SCF/day
  4. M

    Calculating Natural Gas Requirements for a 1000MW Power Plant

    Homework Statement a gas fired turbine generator for producing electricity has an efficiency of about 50%. how many cubic feet would be needed to produce 1000MW for one year. Homework Equations 2.4 x 10 ^8 SCF/day is the natural gas required for the power plant input = 2.4x10^11...
  5. M

    How Is Efficiency Calculated in Coal Gasification Projects?

    Homework Statement For a gasification project being planned, 26000tons of coal per day will be used to produce 250000000 cubic ft per day of natural gas. if the coal is rated at 8700btu/lb and the gas at 950btu/cu ft. what will the efficiency will be? Homework Equations efficiency =...
  6. M

    Energy calculation with no time given

    Homework Statement suppose you had to carry ten 30lb concrete blocks up a 24ft ladder, to build a chimney. if you were paid for the work that you did on the blocks at the same price as electrical energy costs (14 cent kWh). how much money would you make from this job. Homework Equations...
  7. M

    Thermodynamics: conservation of energy

    thnx :P
  8. M

    Thermodynamics: conservation of energy

    Homework Statement Suppose you left a 100w light bulb on continuously for one month. If the electricity generation and transmission efficiency is 30%, how much chemical energy (in joules) was wasted at the power plant for this oversight? if the fuel consumption for one meal in China using...
  9. M

    What is the Kinetic Energy of a 3000lb Car Traveling at 60mph?

    thnx! I now understand!
  10. M

    What is the Kinetic Energy of a 3000lb Car Traveling at 60mph?

    Homework Statement what is the kinetic energy of a 3000lb car traveling at a 60mph (pounds are not units of mass) Homework Equations KE=1/2* mass * velocity ^2 The Attempt at a Solution pounds are the units of force but to calculate the mass I am missing some data unless I'm...