O stars must be formed in spiral arms because _____
a. they do not live long enough to move out of the arm
b. the dust clouds they form from are only found there
c. all stars are formed in spiral arms
d. they are only found in spiral arms their gravitational forces takes them to that location
e. they are left behind and found in the region behind the spiral arm
a
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If the work done to stretch an ideal spring by 4.0 cm is 6.0 J, what is the spring constant (force constant) of this spring?
A) 6000 N/m B) 7500 N/m C) 300 N/m D) 3000 N/m E) 3500 N/m
When the handle of a tuning fork is held solidly against a table, the time the fork keeps vibrating becomes
A) longer. B) shorter. C) remains the same
The approximate intensity ratio between two stars is 100 . Thus the apparent visual magnitude difference between the stars is ______________
a. 1 b. 5 c. 10 d. 100
The heat transfer process in which heat flows directly through the material is
A. conduction B. convection C. radiation