The eye changes its f-number by
a. using the iris to change the size of the pupil.
b. using the ciliary muscle to change the focal length of the lens.
c. Both a & b are correct.
d. The eye does not change its f-number.
c
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Once a basketball player's feet are off the floor in making a jump, the jumper's acceleration
A) depends on launch speed. B) is usually greater for taller players. C) varies with body orientation. D) is g; no more, no less. E) all of the above
The isobaric compressibility or thermal expansion for a material is
What is the air’s isobaric compressibility at 300K?
An incompressible ideal fluid flows steadily through a pipe that has a change in diameter. The fluid speed at a location where the pipe diameter is 8.0 cm is 1.28 m/s. What is the fluid speed at a location where the diameter has narrowed to 4.0 cm?
A) 0.32 m/s B) 0.64 m/s C) 1.3 m/s D) 2.6 m/s E) 5.1 m/s
What happens when two forces act in the same direction?
A. They cancel each other out. B. They are added together. C. They are subtracted. D. Their sum divided by two is the total force.