A group of 10 to 100 stars that formed at the same time but are so widely scattered in space their mutual gravity cannot hold them together is called
a. a globular cluster.
b. an open cluster.
c. an association.
d. a spherical component
e. an accretion disk.
C
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Which of these is a longitudinal wave
A) sound B) light C) radio D) all of the above E) none of the above
A 2.0-kg block sliding on a frictionless horizontal surface is attached to one end of a horizontal spring (k = 600 N/m) which has its other end fixed. The speed of the block when the spring is extended 20 cm is equal to 3.0 m/s. What is the maximum speed of this block as it oscillates?
a. 4.6 m/s b. 5.3 m/s c. 5.7 m/s d. 4.9 m/s e. 3.5 m/s
Shell Radius: Calculate the orbital Bohr radius of the n = 2 excited state in a hydrogen atom. (r1 = 0.0529 nm)
A. 0.212 nm B. 0.106 nm C. 0.169 nm D. 0.243 nm
How is Titan different from all the other Jovian satellites?
a. Titan has frozen water on its surface b. Titan has a heavily cratered surface. c. Titan has a thick atmosphere. d. Titan is the largest moon in the Solar System. e. Titan has a young, very reflective surface.