Final answer:
The unit of measure to describe the torque for tightening a large object is foot-pounds (ft-lbs). Torque measures the rotational force applied to an object. It is expressed in newtons-meters in the metric system and can be converted to foot-pounds in the customary system.
Step-by-step explanation:
The unit of measure used to describe the torque needed to tighten a large object is d) Foot-pounds (ft-lbs). Torque is the rotational equivalent of force and essentially measures how much force is being applied to rotate an object around an axis. In SI units, torque is measured in newtons times meters (N·m). However, in the United States, foot-pounds are commonly used, which is a measure of torque that combines the distance in feet with the force in pounds. For instance, when you push perpendicularly on a wrench with a force of 165 N at a distance of 0.140 m from the center of the bolt, the torque exerted is calculated by the product of the force (in newtons) and the distance (in meters) to get a value in newton-meters. This value can then be converted to foot-pounds if needed, which suits the customary systems used in certain regions.