When a cutting plane extends completely through an object, usually along a centerline, ____.
A. the cutting plane line is marked with an identifying letter
B. a full section is shown
C. the cutting plane arrows show the direction of sight
D. both b and c
E. all of the above
Answer: D
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A light fixture contains five lightbulbs. The lifetime of each bulb is exponentially distributed with mean 200 hours. Whenever a bulb burns out, it is replaced. Let T be the time of the first bulb replacement. Let 
, i = 1,..., 5, be the lifetimes of the five bulbs. Assume the lifetimes of the bulbs are independent.
a. Find P(
> 100).
b. Find P(
> 100 and 
> 100 and... and 
> 100).
d. Find P(T ? 100).
e. Let t be any positive number. Find P(T ? t), which is the cumulative distribution function of T.
f. Does T have an exponential distribution?
g. Find the mean of T.
h. If there were n lightbulbs, and the lifetime of each was exponentially distributed with parameter ?,what would be the distribution of T?
In Mesopotamian society, writing was a tool that empowered
a. warriors and farmers. b. artists and scientists. c. women and slaves. d. priests and rulers.
A normally open set of relay contacts will close when:
A) Power is applied to the relay coil. B) Power is applied to the contacts. C) Power is not applied to the contacts. D) Power is not applied to the relay coil.
If the cause of the problem is not immediately understood, the process of _____ is often the procedure of choice
A) disassembly B) elimination C) trial and error D) breakdown