A new electric power plant has an efficiency of 42%. For every 100 barrels of oil needed to run the turbine, how many are essentially lost as waste heat (in barrels of oil) to the environment?
a. 21
b. 42
c. 58
d. 10
e. 79
c
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Two in-phase loudspeakers are placed 6.00 m apart along one wall of a room. They emit sound with a frequency of 512Hz
Starting at the location of one of the loudspeakers, a microphone is moved in a direction perpendicular to the wall until constructive interference is detected for the first time. How far is the microphone from the wall at that point? The speed of sound in air is 330 m/s. A) 0.141 m B) 0.664 m C) 0.203 m D) 0.138 m E) 0.282 m
Which numbered position in the figure shows a planet at opposition?
A) 1 B) 2 C) 3 D) 4
We would expect other planets beyond our own solar system to orbit the equators of their home stars, as our own planets orbit the Sun
Indicate whether the statement is true or false
The planetary model of the hydrogen atom consists of an electron in a circular orbit about a proton. The motion of the electron of charge 1.60 × 10^?19 C creates an electric current. The radius of the electron orbit is 5.30 × 10^?11 m and the electron's velocity is 2.20 × 10^6 m/s. What is the magnetic field strength at the location of the proton?