Yahoo Answers is shutting down on May 4th, 2021 (Eastern Time) and beginning April 20th, 2021 (Eastern Time) the Yahoo Answers website will be in read-only mode. There will be no changes to other Yahoo properties or services, or your Yahoo account. You can find more information about the Yahoo Answers shutdown and how to download your data on this help page.

Trending News

Promoted
?
? asked in Science & MathematicsPhysics · 3 years ago

A Boeing 747 with a mass of 285,000 kg cruises at an altitude of 31,000 ft at a constant speed of 544 mi/hr.?

What is the kinetic energy of the aircraft? What is the potential energy of the aircraft? What is the total energy of the aircraft?

Update:

please help

1 Answer

Relevance
  • oubaas
    Lv 7
    3 years ago

    using SI :

    31000 ft = 31000*0.3048 = 9449 m

    544 mph = 544*1.6094/3.6 = 243.2 m/sec

    Ek = m/2*V^2 = 285/2* 243.2^2/1000 = 8,428 Mjoule

    Ep = m*g*h = 285*9.8*9.449 = 26,391 Mjoule

    E = Ep+Ek = 8,428+26,391 = 34,819 Mjoule

Still have questions? Get your answers by asking now.