idel air control or vaccume leak
Gravity.
Montana
the normal speed of a car is 120 Mph
45-50mph
i have a 2003 ford focus zx3 when going down the road even at differet speeds at times it vibrates and starts to studder for a 3 or 4 seconds then the car resumes back to normal speed it almost feal like its cutting back
speed of a rattlesnake?
It varies, depending on the gas, and on the properties of the gas (mainly temperature and pressure). But under "normal" circumstances, the speed of light in a gas is almost the same as the speed of light in a vacuum.
Titanic almost had no more speed to speed up to. She was sailing at almost top speed during her entire journey.
That is a normal wind speed that usually is daily.
The change in speed causes the light to bend. If it is travelling from an optically dencer to an optically rarer medium the ray will bend away from the normal. But if it is travelling from an optically rarer to an optically denser medium then it will bend towards the normal.
The same as it is for any other vehicle. Montana does not have a separate commercial vehicle speed limit, save for mountainous areas of downgrades where vehicle over 26,000 lbs. GVWR will have a lower speed limit indicated in signage.
There are many different causes of poor vehicle performance. Here are some examples. If the engine RPMs are high but the vehicle will not reach normal speed then there is a problem with the engine's connection to the drive line. If the engine is running rough it will not be able to produce a normal amount of power. If the exhaust is plugged the engine will not be able to breath. There are many more possible causes.