The function of the electric motor is which one of the following conversion processes?
a. mechanical energy to electrical
b. electrical energy to mechanical
c. low voltage to high or vice versa
d. alternating current to direct
b
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A car horn emits a frequency of 400 Hz. A car traveling at 20.0 m/s sounds the horn as it approaches a stationary pedestrian
What frequency does the pedestrian hear? The speed of sound in air is 343 m/s. A) 200 Hz B) 375 Hz C) 400 Hz D) 425 Hz E) 450 Hz
Matter Waves: Calculate the kinetic energy, in electron-volts, of a neutron that has a de Broglie wavelength of 7.2 × 10-12 m (mneutron = 1.675 × 10-27 kg, 1 eV = 1.6 × 10-19 J, h = 6.626 × 10-34 J ? s)
Fill in the blank(s) with the appropriate word(s).
The Large and Small Magellanic clouds are satellites galaxies of the Milky Way
Indicate whether the statement is true or false
Reflection nebula are bluer than the stars that illuminate them. The Earth's sky is bluer than the Sun. Is this a coincidence? Explain why or why not
What will be an ideal response?