Why is it important for the structural draft er to be able to visualize?
What will be an ideal response?
Usually, the draft er is not simply copying structures that already exist, but is imagining and trying to visualize something yet to be built.
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A solid body at initial temperature T0 is immersed in a bath of water at initial temperature Tw0. Heat is transferred from the solid to the water at a rate 
, where K is a constant and Tw and T are instantaneous values of the temperatures of the water and solid. Develop an expression for T as a function of time ?. Check your result for the limiting cases, ? = 0 and ? = ?. Ignore effects of expansion or contraction, and assume constant specific heats for both water and solid.
What will be an ideal response?
Approximately how often is a typical building reroofed?
What will be an ideal response?
?Modulated current metal transfer uses an extremely modified version of _________.
Fill in the blank(s) with the appropriate word(s).
Refer to Exercise 25. Assume that if m = 0, the value s = – 1.5 is sent, and if m = 1, the value s = 1.5 is sent. The value received is X, where X = s + E, and E ~ N(0, 0.64). If X ? 0.5, then the receiver concludes that m =0, and if X > 0.5, then the receiver concludes that m = 1.
a. If the true message is m = 0, what is the probability of an error, that is, what is the probability that the receiver concludes that m = 1? b. If the true message is m = 1, what is the probability of an error, that is, what is the probability that the receiver concludes that m = 0? c. A string consisting of 601s and 400s will be sent. A bit is chosen at random from this string. What is the probability that it will be received correctly? d. Refer to part (c). A bit is chosen at random from the received string. Given that this bit is 1, what is the probability that the bit sent was 0? e. Refer to part (c). A bit is chosen at random from the received string. Given that this bit is 0, what is the probability that the bit sent was 1?