The cosmological principle states that any observer in any galaxy sees the same general properties for the Universe
a. True
b. False
Indicate whether the statement is true or false
True
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If the number of turns on the transformer input is greater than the number on the output, then the transformer
A. outputs greater voltage than at the input. B. outputs less current than at the input. C. outputs greater voltage and current than at the input. D. outputs less voltage than at the input. E. increases the voltage but does not affect the current.
The tensile strength of 99.8 % dense sintered alumina is 205 MPa, in comparison to a tensile strength of 125 MPa for 85 % dense sintered alumina. The value of the KIc for the alumina is 4 MPa?m1/2. Compare the defect lengths in these two alumina materials, assuming that the fracture is caused by existing internal cracks.
What will be an ideal response?
An eclipse of the Moon (lunar eclipse) as seen from Earth, happens when
a. the hot luminous Moon suddenly cools and stops emitting light. b. the Moon passes between Earth and the Sun. c. the Earth is between the Moon and the Sun. d. the Moon is 90 degrees from the direction of the Sun.
Which stars always have large positive absolute magnitude?
a. stars of high luminosity b. stars of low luminosity c. nearby stars d. distant stars e. not enough information given