An airliner with mass 90 000 kg is flying at 900 km/h at a height of 15.0 km. What is its total energy (kinetic + potential) if the total was 0 when the airliner was at rest on the ground?
a. 5.0E+10 J
b. 3.6E+10 J
c. 1.3E+10 J
d. zero
e. 1.6E+10 J
e
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An atom that has lost or gained one or more electrons is called a(n) ____
a. ion b. isotope c. nucleus d. molecule e. electron
As a body heats, the radiation it emits ________.
A. decreases in intensity B. peaks at a shorter wavelength C. increases in wavelength D. peaks at a longer wavelength E. All of these choices are correct.
An 800-MW electric power plant has an efficiency of 30%. It loses its waste heat in large cooling towers. Approximately how much waste heat (in MJ) is discharged to the atmosphere per second?
A. 1 200 B. 1 900 C. 800 D. 560 E. 240
Why is most matter electrically neutral?
a. It contains no charges. b. There are equal amounts of positive and negative charges present. c. The charge on the electrons and protons in the material is too small to notice. d. none of the above