If the rate at which a pulsar is slowing down is found, this helps us find the time at which it was produced by the supernova
Indicate whether the statement is true or false
TRUE
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The primary mirror in an astronomical telescope must be a
a. half-silvered mirror. b. convex mirror. c. concave mirror. d. plane mirror.
Design a composite material made of epoxy and uniaxial E-glass fibers that has an axial thermal conductivity of 8 Wm-1 K-1 . The thermal conductivity of E-glass is 13 Wm-1 K-1 , and for epoxy it is 0.1 Wm-1 K-1 .
(a) What is the volume fraction of fibers and matrix in this composite? (b) What is the transverse thermal conductivity of this material?
The most important property that determines the evolution of a star is its
A. composition. B. mass. C. temperature. D. location.
Light passes from a material with index of refraction 1.1 into one with index of refraction 1.5 after being incident at a non-normal angle (?inc ? 0). Compared to the incident ray, the refracted ray will
1.be unaffected. 2.bend towards the normal. 3.follow the normal. 4.bend away from the normal.