Ancient astronomers thought the heavens were perfect circles, spheres, and unblemished
a. True
b. False
Indicate whether the statement is true or false
True
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Which is NOT true?
A. A star that appears brighter than another is always closer. B. A blue Main Sequence star has a higher luminosity than a red main sequence star C. More massive Main Sequence stars are always both hotter and brighter than less massive Main Sequence stars D. A B-type Main Sequence star that appears 100 times brighter than another B type Main Sequence star is 10 times closer E. The spectrum of a star allows us to estimate its temperature
In a double slit experiment, a beam of electrons strikes a pair of slits
The slits are 15 ?m apart, and the first interference maximum lies at an angle of 0.50 µrad from the center of the interference pattern. What is the momentum of the incoming electrons? (h = 6.626 × 10-34 J ? s, mel = 9.11 × 10-31 kg) A) 8.8 × 10-23 kg ? m/s B) 1.1 × 10-23 kg ? m/s C) 2.2 × 10-23 kg ? m/s D) 4.4 × 10-23 kg ? m/s E) 6.6 × 10-23 kg ? m/s
How can a tapered channel (tapchan) work to produce energy? Explain
What will be an ideal response?
Simple Harmonic Motion: The position of an object that is oscillating on a spring is given by the equation x = (17.4 cm) cos[(5.46 s-1)t]. What is the angular frequency for this motion?
A. 0.183 rad/s B. 5.46 rad/s C. 2.34 rad/s D. 17.4 rad/s E. 0.869 rad/s