An electric motor on an airplane operates on 21.5 volts and draws a current of 11.0 amperes. How much energy (in joules) does the motor use during a 9.0-hour flight?
a. 1064.4 b. 2128.5
c. 127710.0 d. 7662600.0
d
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Why is the inner core solid even though it is hotter than the outer liquid core?
A. The dynamo effect causes ions in Earth's interior to become solid. B. The great pressure at Earth's center forces the atoms in the core together, causing it to solidify. C. Radioactivity causes liquid materials to become solid. D. This is not unusual: hotter things tend to be more solid.
An ultraviolet light wave has a wavelength of 300 nm and speed of 1.96 × 10^8 m/s through a transparent medium. What is the frequency of this wave in the medium? (1 nm = 10?9 m and c = 3.00 × 10^8 m/s)
a. 1.00E+15 Hz b. 3.27E+14 Hz c. 6.53E+14 Hz d. 6.53E+5 Hz e. 1.28E+7 Hz
Bohr's revolutionary step in his theory was to ______________ the angular momentum of the electron
Fill in the blank(s) with correct word
The half life of uranium-232 is 70 years. The time for 3/4 of a sample of uranium-232 to decay is 105 years
Indicate whether the statement is true or false