A pair of stars orbit around one another in an elliptical orbit with a semi-major axis, a, of 1 AU with an orbital period, P, of 1 year. What is the mass of the pair of stars?
a. 1 solar masses
b. 2 solar masses
c. 4 solar masses
d. 8 solar masses
e. 16 solar masses
a
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You whirl a 2 kg body attached to a 1 meter cord around your head in a nearly horizontal circle with a speed of 4 m/s. The tension in the cord is _________
Fill in the blank(s) with correct word
Compared with our Sun, most stars in the halo are
A) young, red, and dim and have fewer heavy elements. B) young, blue, and bright and have much more heavy element material. C) old, red, and dim and have fewer heavy elements. D) old, red, and dim and have much more heavy element material. E) old, red, and bright and have fewer heavy elements.
The spectral lines are more distinct when viewed in a mercury vapor lamp under
A) high pressure. B) low pressure. C) same for each
The zeroth law of thermodynamics pertains to what relational condition that may exist between two systems?
a. zero net forces c. zero temperature b. zero velocities d. thermal equilibrium