Work is only accomplished when an object is ____________________, ____________________, or redirected by a force.
Fill in the blank(s) with the appropriate word(s).
started, stopped
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The final drive gear is provided by the ____________________.
Fill in the blank(s) with the appropriate word(s).
A circulating pump for a solar collector costs $376.60. A contractor can buy it for 
? off. What will the contractor pay for the pump?
Fill in the blank(s) with the appropriate word(s).
The major atmospheric contaminations come from ____.
A. carbon monoxide B. carbon dioxide and nitrogen C. oxygen and nitrogen D. ozone
Condensing temperatures in an air-cooled condensing unit can be reduced by ____.
A. increasing the condensing surface area B. increasing the cfm through the condenser C. decreasing the temperature of the air entering the condenser D. all of the above