When traveling north from the United States into Canada, you'll see the North Star (Polaris) getting ________
A) higher in the sky B) lower in the sky C) dimmer D) brighter
A
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What is the most abundant element in the interstellar medium?
a. carbon b. iron dust c. carbon dust d. helium e. hydrogen
A magnetic field will be produced at a point in space if an electric field at that point
a. exists. b. gets stronger. c. gets weaker. d. changes direction. e. all of the above
A composite material is made of 50 % uniaxial glass fibers and 50% epoxy resin. The epoxy matrix is cured at 150ºC and then cooled to 25ºC. The elastic modulus of the glass fibers is 76 GPa, and the thermal expansion coefficient is 5×10-6 °C-1 . The elastic modulus of the epoxy resin is 4 GPa, and the thermal expansion coefficient is 60×10-6 °C-1 .
(a) Calculate the thermal stresses, both the magnitude and sign, in the matrix and in the fibers after the cured composite is cooled to room temperature. Assume that each material is elastic. (b) Calculate the composite strain in cooling from 150°C to 25°C.
In the novel Contact by Carl Sagan, an extremely advanced civilization has constructed a labyrinth of wormholes throughout the galaxy. A civilization capable of such a feat would most likely be classified as what kind of civilization?
A) Type III B) Type II C) Type IV D) Type I