Where are the Cepheid and RR Lyrae variable stars located on the H-R Diagram?
a. just above and to the right of B type stars
b. just above and to the right of O type stars
c. in the variable strip
d. in the instability strip
e. outside the H-R Diagram as missing items
d
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A battery is rated at 12. V and 160. A ? h. How much charge does the battery store?
What will be an ideal response?
An object moving in simple harmonic motion has an amplitude of 0.020 m and a maximum acceleration of 20 m/s2 . What is the frequency of the system?
a. 0.40 Hz c. 10.1 Hz b. 5.0 Hz d. 32 Hz
Each atom in a 7.0 microgram piece of calcium (A=40, Z=20) has one electron removed. What is the total charge collected in this way?
A. 34 mC B. 670 mC C. 17 mC D. 60 mC
According to our present theory of solar system formation, which of the following best explains why the solar nebula ended up with a disk shape as it collapsed?
A) The force of gravity pulled the material downward into a flat disk. B) The law of conservation of energy C) It was fairly flat to begin with, and retained this flat shape as it collapsed. D) It flattened as a natural consequence of collisions between particles in the nebula.