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

Physics & Space Science

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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?

Physics & Space Science

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

Physics & Space Science

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

Physics & Space Science

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.

Physics & Space Science