Author Question: An 80,000-kg airliner is flying at 900 km/h at a height of 8.00 km. What is its total energy ... (Read 58 times)

rayancarla1 · **on:** Jul 28, 2018

An 80,000-kg airliner is flying at 900 km/h at a height of 8.00 km. What is its total energy (kinetic + potential) if the total was 0 when the airliner was at rest on the ground?
a. 250 MJ
c. 8770 MJ
b. 478 MJ
d. 10,300 MJ

Question 2

An electrical power plant manages to send 88 of the heat produced in the burning of fossil fuel into the water-to-steam conversion. Of the heat carried by the steam, 30 is converted to the mechanical energy of the spinning turbine. Which of the following choices best describes the overall efficiency of the heat-to-work conversion in the plant (as a percentage)?
a. greater than 88
c. 30
b. 64
d. less than 30