Which of the following procedures would not increase the fracture strength of a polycrystalline ceramic?
(a) Decreasing the porosity
(b) Solid-solution alloy additions to increase the yield strength
(c) Creating an acicular microstructure
(d) Mixing ductile steel wires with the ceramic
(b) Solid-solution alloy additions to increase the yield strength
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What type of object is believed to be the central source of energy for an active galaxy?
A. globular cluster B. a large amount of gas and dust C. an unusually large and bright main sequence star D. a massive black hole
Which statement about black holes is true?
A) Their event horizon is a physical surface boundary. B) Their main-sequence mass was 5-10 solar masses. C) They form from 1.4 solar mass stars. D) Their escape velocity is greater than the speed of light. E) They form an event horizon at twice the Schwartzschild radius.
From the edge of a roof top you toss a green ball upwards with initial speed v0 and a blue ball downwards with the same initial speed. Neglect air. When they reach the ground below
A) the green ball will be moving faster than the blue ball. B) the blue ball will be moving faster than the green ball. C) the two balls will have the same speed.
The speed of an object is given by v = 5.00t2 +4, where v is in m/s and t is in s. What is the acceleration of the object at t = 2.00 s?
a. 5.00 m/s2 b. 9.00 m/s2 c. 10.0 m/s2 d. 14.0 m/s2 e. 20.0 m/s2