The coefficient of linear expansion for brass is 19. × 10-6 K-1. What is its coefficient of volume expansion?
A) 5.7 × 10-5 K-1
B) 8 × 10-18 K-1
C) 57. × 10-5 K-1
D) 3.8 × 10-6 K-1
E) 38. × 10-6 K-1
A
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O and B stars only occur in the galactic _______________
Fill in the blank(s) with correct word
What is hot dark matter?
A) a type of electron that moves more rapidly than ordinary electrons do. B) hypothetical heavy fundamental particles that interact with baryons only through gravity and the weak force. C) hypothetical low mass particles that travel close to the speed of light but do not emit radiation. D) a type of proton that moves more rapidly than ordinary protons do. E) a type of neutron that moves more rapidly than ordinary neutrons do.
Double-pane windows contain nitrogen rather than air to prevent
A) gas escape. B) thermal conduction. C) condensation. D) heat flow.
The presently accepted value of the Hubble constant gives an age of:
A) 4.5 billion years. B) 8-9 billion years. C) 14 billion years. D) 18 billion years. E) 22 billion years.