How hot was the universe at time zero?
A) 2.73 K
B) 5, 800 K
C) 16, 000 K
D) 1032 K
E) We have no theory capable to addressing this question.
E
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A horizontal force of 1000 N is needed to overcome the force of static friction between a level floor and a 250-kg crate. If g = 9.8 m/s2, what is the coefficient of static friction?
a. 4.0 c. 0.41 b. 0.51 d. 0.31
The ratio of the tensile fracture strength of ceramics to the compressive fracture strength is typically:
(a) 0.1 to 0.2 (b) 5 to 10 (c) 1 (d) 0.5
A precision yellow brass casting is to be produced that should have a final length of 0.2000 m at room temperature (23°C). The casting is produced by pouring liquid brass into the cavity of a mold and allowing the liquid to solidify. The melting temperature of the brass is 800°C. What should be the mold cavity length?
What will be an ideal response?
A mirror has a focal length -20 cm. If an object is placed 10 cm in front of the mirror, where will the image form?
A. 20 cm in front of the mirror B. 20 cm behind the mirror C. 6.7 in from of the mirror D. 6.7 behind the mirror E. no image will form