The figure above shows an example of a(n) ______.
A. storyboard
B. wireframe
C. heat map
D. site map
Answer: B
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Capacitors in Combination: Two capacitors are connected as shown in the figure, with C1 = 4.0 µF and C2 = 7.0 µF. If a voltage source V = 90 V is applied across the combination, find the potential difference across C1.
A. 57 V B. 36 V C. 60 V D. 9.0 V
A neutron bouncing off a heavy nucleus loses speed. If it instead bounces off a light nucleus it loses
A) less speed. B) more speed. C) the same amount of speed.
The development of contact lenses has transformed the solutions that are available today for vision impairments. However, wearing them also poses several problems that includes the condition of dry eyes due to lack of cooling, oxygenation, and moisturizing or lubrication of cornea, among others. In a development phase of a new protective liquid for contact lenses, the optometrist would like to know rate of heat loss from the anterior chamber of the eye through the cornea and the contact lens. The system is modelled as a partial hollow sphere, as shown in schematic diagram. The inner and outer radius of the cornea are respectively r1=10 mm and r2=12.5 mm, and the outer radius of the fitted contact lens is r3=14.5 mm. The anterior chamber, which contains the aqueous humor that provides
nutrients to the cornea (as the later tissue has no blood vessels), exposes the inner surface of the cornea to a temperature of Ti=36.90C with a convective heat transfer coefficient of h? i=10 W/(m2 K). The thermal conductivity of transparent tissue of cornea is 0.35 W/(m K), and that of the contact lens material is 0.8 W/(m K). The outer surface of the contact lens is exposed to room air at T0=220C and has a convection coefficient of h? 0=5 W/(m2 K). Draw a thermal circuit for the system showing all of the temperature potentials and thermal resistances. Then estimate the rate of heat loss from the anterior eye assuming that steady state exists and eye aperture spherical angle is of 1000
GIVEN
Inner radius of cornea r1=10 mm=0.01 m
Outer radius of cornea r2=12.5 mm=0.0125 m
Radius of contact lens r3=14.5 mm=0.0145 m
Inner cornea temperature Ti=36.90C
Inner convective heat transfer coefficient h?i=10 W/(m2 K)
Conductivity of cornea tissue (k1)=0.35 W/(m K)
Conductivity of lens material (k2)=0.8 W/(m K)
Room air temperature T0=220C
Outer convection coefficient of h?0=5 W/(m2 K)
FIND
Draw thermal circuit showing all temperature potentials and thermal resistances
Estimate rate of heat loss from anterior eye.
ASSUMPTIONS
Steady state conditions persist
Properties remain constant.
Eye is treated as partial hollow sphere sweeping an angle of ? =1000
SKETCH
Diffraction Gratings: What is the slit spacing of a diffraction grating necessary so that 600-nm light will produce a first order principal maximum at 25.0° away from the centerline?
A. 1.42 ?m B. 2.01 ?m C. 3.12 ?m D. 4.12 ?m E. 5.44 ?m