Question

The rear tire of a motor vehicle must not have less than ____ millimeters.

a. 0.5 mm.
b. 1.0 mm.
c. 1.5 mm.
d. 2.0 mm

Answer 1

The minimum tread depth of a motor vehicle's rear tire varies by jurisdiction, commonly at least 1.6 millimeters. For the physics problems, calculate the number of tire revolutions by dividing the distance traveled by tire circumference and determine mechanical advantage with radius ratios.

Step-by-step explanation:

Regarding the question about the minimum tread depth for a motor vehicle's rear tire, different countries have different legal requirements. It's commonly suggested that the minimum legal tread depth should be at least 1.6 millimeters for safety reasons. However, without the specific jurisdiction or context, it is advisable for students to refer to their local traffic laws to find the exact requirement. For the physics problems:

1. An automobile with 0.260 m radius tires travels 80,000 km before wearing out. The number of revolutions the tires make is calculated by dividing the total distance traveled by the circumference of the tire (distance per revolution).
2. For the car axle and tire radius question, the mechanical advantage can be calculated by dividing the radius of the tire by the radius of the axle.

Please note that for legal advice such as traffic laws or mechanical recommendations, always refer to authoritative sources or local regulations.