True or false? The United States has more land in forests today than in the 1600s
What will be an ideal response?
False. The forested area in the United States today is about 70 percent of what it was in 1607
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The motor starter is similar to the contactor in design and operation. The important difference is the ____.
a. convenience of remote control on one motor or multiple motors b. use of overload relays on the motor starter c. rated horsepower and rated voltage d. closing of contacts that connect the motor to the source of electrical power
PROBLEM 2.8
Two gage marks are placed exactly 10 in. apart on a 1/2 -in.-diameter aluminum rod with E = 10.1 ? 106 psi and an ultimate strength of 16 ksi. Knowing that the distance between the gage marks is 10.009 in. after a load is applied, determine (a) the stress in the rod, (b) the factor of safety.
When a floor creeper is not in use, it should be stood on _____ or pushed under a car so it is not accidentally stepped on.
What will be an ideal response?
High- and low-pressure safety switches are installed in _____
a. series in the compressor's contactor coil b. series in the compressor's common conductor c. parallel with the compressor's contactor d. series with a current-sensing loop