Light precedes through three polarizing sheets. Unpolarized light enters the 1st sheet and the resultant vertically polarized beam continues through the 2nd and 3rd
The 2nd sheet has its transmission axis at 50.° with respect to the 1st, and the 3rd is at 70.° with respect to the 1st.
(a) What percent of the original intensity emerges from filter #1?
(b) What percent of the original intensity emerges from filter #2?
(c) What percent of the original intensity emerges from filter #3?
(d) If filter #2 has its transmission axis changed to 30.°, what % intensity now emerges from the 3rd filter?
(a) 50.%
(b) 21.%
(c) 18.%
(d) 22.%
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Water flowing at a rate of 12.6 kg/s is to be cooled from 90 to 65°C by means of an equal flow rate of cold water entering at 40°C. The water velocity with the such that the overall coefficient of heat transfer U is 2300 W/(m2 K). Calculate the heat-exchanger surface area (in square meters) needed for each of the following arrangements: (a) parallel flow, (b) counterflow, (c) a multi-pass heat exchanger with the hot water making one pass through a well-baffled shell and the cold water making two passes through the tubes, and (d) a crossflow heat exchanger with both sides unmixed.
GIVEN
• Warm water cooled by cold water in a heat exchanger
• Both flow rates ( m c) = 12.6 kg/s
• Water temperatures
? Th,in = 90°C
? Th,out = 65°C
? Tc,in = 40°C
• Overall heat transfer coefficient (U) = 2300 W/(m2 K)
FIND
The transfer area (A) for (a) Parallel flow (c) Tube-and-shell; 1 hot shell pass, 2 cold tube passes (b) Counterflow (d) Crossflow–both unmixed
ASSUMPTIONS
• The specific heat is constant
SKETCH
PROPERTIES AND CONSTANTS
the specific heat of water in the temperature range of interest (cp) = 4187 J/(kg K)
Charge of uniform density 12 nC/m is distributed along the x axis from x = 2.0 m to x = 5.0 m. What is the electric potential (relative to zero at infinity) at the origin (x = 0)?
a. 91 V b. 99 V c. 82 V d. 74 V e. 140 V
If distance from the Sun were the only factor affecting surface habitability, which of the following would be habitable?
A) the Moon B) Venus C) Mercury D) all of these
The ________ track is the path the star takes on the H-R diagram as it ages
Fill in the blank(s) with correct word