Both RR Lyrae and Cepheid variable stars are stars that, when on the main sequence, were considered to be:
A) low mass.
B) intermediate mass.
C) high mass.
D) zero-age main sequence.
E) blue stragglers.
C
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A. 63° B. 35° C. 46° D. 74°
Three solid, uniform, cylindrical flywheels, each of mass 65.0 kg and radius 1.47 m rotate independently around a common axis
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A violin with string length 32 cm and string density 1.5 g/cm resonates with the first overtone from a 2.0-m long organ pipe with one end closed and the other end open. What is the tension in the string?
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A spaceship is observed from the Earth to be moving toward a star at a speed of 0.80 c. If the distance from the spaceship to the star is 1.6 ly as measured from earth, how far is the star as measured from the moving space ship?
A. 2.1 ly B. 1.9 ly C. 1.6 ly D. 1.2 ly E. 0.96 ly