Question

1. trains need to prepare to stop up to ______ in advance.

a) 10 feet
b) 100 feet
c) 1000 feet
d) 1 mile

1. traveling at high altitudes ______ vehicle engine performance when compared to operating the same vehicle at sea level.

a) increases
b) does not affect
c) lessens
d) none of the above

Explanation:

Question 15

Trains have large mass and momentum, so they need a significant distance to stop. 10 feet or 100 feet are too short, and 1 mile is overly long. Trains typically need to prepare to stop up to 1000 feet in advance due to their inertia and braking requirements.

At high altitudes, the air is less dense, meaning there's less oxygen for combustion in the vehicle engine. This reduces the engine's efficiency and power output, so engine performance lessens compared to sea - level operation.

Answer:

c) 1000 feet

Question 16