Compare and contrast the properties of disk and halo stars
What will be an ideal response?
Most of the stars in the disk are middle- to lower-main-sequence stars like the Sun, a few are red giants and white dwarfs, and fewer still are brilliant blue O and B stars. Those hot, massive stars are rare, but they are so luminous that they provide much of the light from the disk. Halo stars are old, cool, lower-main-sequence stars, red giants, and white dwarfs.
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To create the above spectra, which of the following is NOT true?
a. A dense gas is excited and the light produced is over all wavelengths.
b. A low-density gas is excited and the light produced is over discrete wavelengths.
c. Light from a low-density gas passes through a warm, dense gas and the light that is produced is at all wavelengths except for a few discrete wavelengths.
d. All of the other choices are not true.
In the above model of an atom, where would the proton be located?
a. A
b. 1
c. 2
d. 3
A ski lift carries passengers up a 150 m high slope at the rate of one chair every 30.0 seconds. If the chair will hold two passengers with a total mass of 190 kg, then the power of the engine that powers the ski lift is
A. 6.96 kW. B. 7.83 kW. C. 8.75 kW. D. 9.31 kW. E. 9.90 kW.
A coil of 57. turns of wire has a diameter of 9.5 cm and carries 7.2 Amperes
(a) How large is the magnetic field, in Tesla, at the center of the loop? (b) How many Gauss is that? (c) If the same length of wire made a coil with twice the original diameter, how large is the magnetic field now?