______ navigation provides an overview of the website, and generally remains consistent from page to page.
A. Primary
B. Subsidiary
C. Contextual
D. Adaptive
Answer: A
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A 2.0 kg softball is pitched to you at 20. m/s. You hit the ball back along the same path, and at the same speed. If the bat was in contact with the ball for 0.10 s, the average force the bat exerted was
A) 0.40 kN. B) 40. N. C) zero. D) 0.80 kN. E) 0.65 kN.
A uniform film of oil (n = 1.31) is floating on water. When sunlight in air is incident normally on the film, an observer finds that the reflected light has a brightness maximum at l = 450 nm and a brightness minimum at l = 600 nm. What is the thickness of the oil film?
A lunar eclipse can only occur when the Moon is ____
a. full b. new c. waxing d. waning e. rising
Why is there a limit to how much compression can be counterbalanced by electron degeneracy pressure?
A) At extreme compression, the electron speeds approach the speed of light and therefore cannot increase further. B) At extreme compression, electrons are forced to stop moving, and once stopped there is nothing more they can do. C) At extreme compression, atoms are fully ionized so that electrons go free and can no longer exert pressure. D) Because electrons are small, they are simply incapable of exerting much pressure.