A 35-mm digital camera using a standard 50.0 mm lens is focused on a 1.80 m tall person who is standing 3.25 m from the lens. You now refocus the camera on a 15.0 cm tall flower that is 75.0 cm from the lens
(a) In refocusing, by how much did you move the lens? Did you move it toward the film or away from it?
(b) What is the height of the flower's image on the CCD sensor?
(a) 2.79 mm, away from the film (b) 10.7 mm
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Engine oil at 100°C flows over and parallel to a flat surface at a velocity of 3 m/s. Calculate the thickness of the hydrodynamic boundary layer at a distance 0.3 m from the leading edge of the surface.
GIVEN
Engine oil flows over a flat surface
Engine oil temperature (Tb) = 100°C
Engine oil velocity (U) = 3 m/s
FIND
The hydrodynamic boundary layer thickness (?) at a distance 0.3 m from the leading edge
ASSUMPTIONS
Steady state
SKETCH
PROPERTIES AND CONSTANTS
From Appendix 2, Table 17, for engine oil at 100°C
Kinematic viscosity (v) = 20.3 ? 10–6 m2/s
All heat engines:
a. move heat from colder regions to hotter regions. b. convert some of the heat into work. c. add work to the movement of heat. d. can potentially extract nearly limitless energy from the thermal energy of their environment. e. are too large and cumbersome to be used in automobiles.
Thermoset polyester (PET) is produced by cross-linking a(n) _________form of PET.
Fill in the blank(s) with the appropriate word(s).
One explanation of the dark sky Olbers's Paradox is that light can reach us only from objects in space out to a distance in light years _______ the age of the universe in years
a. less than b. greater than c. equal to d. less than or equal to e. greater than or equal to