Final answer:
Technician A is correct; a torque wrench should be used to ensure the precise application of torque, while Technician B's advice to tighten in a circular pattern is incorrect, with the crisscross method being preferable.
Step-by-step explanation:
The question involves a scenario from automotive engineering, specifically the correct procedure for attaching lugnuts to a vehicle. Technician A's advice to use a torque wrench is correct because each lugnut should be tightened to the manufacturer's specified torque to ensure even clamping force and to prevent warping or damage to the wheel or studs. This ensures the safety and drivability of the vehicle. The torque wrench allows for precise application of the specified torque.
Technician B suggests tightening the lugnuts in a circular pattern, which is not the best practice. Instead, lugnuts should be tightened in a star or crisscross pattern. This method promotes even distribution of force across the wheel and prevents warping. As each lugnut is tightened, the wheel is pulled closer to the hub assembly, and tightening them in sequence around the wheel can lead to misalignment or uneven tightening. Therefore, the crisscross pattern is recommended for most vehicles. So, Technician B's advice is not the best practice, although the intent of evenly distributing torque is correct.
To answer the reference information provided, for a bolt requiring a 62.0 N.m torque with a 20 cm (0.20 m) wrench, the perpendicular force required would be calculated using the torque formula: τ = r * F, where τ is the torque, r is the distance (radius) from the center, and F is the force applied. In this case, F = τ / r = 62.0 N.m / 0.20 m = 310 N.