A track star in the broad jump goes into the jump at 12.0 m/s and launches himself at 26.0° above the horizontal. How long is he in the air before returning to Earth? (g = 9.8 m/s2)
a. 0.5 s
b. 1.1 s
c. 2.1 s
d. 2.2 s
e. 1.2 s
b
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Strain-hardening in metals is due to
(a) A reduction in dislocation density due to dislocations running out of the crystals (b) The creation of immobile dislocations by dislocation reactions (c) A reduction in dislocation density by dislocation annihilation (d) Foreign atoms pinning dislocations
When light travels from a larger index of refraction towards a smaller index of refraction, there is no phase change upon reflection at the boundary
Indicate whether the statement is true or false
What is the similarity between burning and respiration?
A) Both reactions consume energy. B) Both reactions involve the combination of carbon with oxygen. C) Both reactions create oxygen. D) Both reactions consume glucose. E) Actually there is no similarity between them.
Coherent sources of light have a varying phase difference
Indicate whether the statement is true or false