VAGUS
The substances which cause chemical reactions in a cell are protein catalysts called enzymes. Some cause reactions that would otherwise not occur and others speed reactions up. Carbon dioxide dissolves in water by itself but since this a dangerous substance to have in cells, there is a catalyst that dissolves it 300 times faster.
Yes.
It dies out by slowing down :P
Velocity and acceleration are related in that acceleration is the rate of change of velocity over time. If an object is accelerating, its velocity is changing. A positive acceleration means the object is speeding up, while a negative acceleration means the object is slowing down.
These two cases are represented by "positive" acceleration. The opposite cases (slowing down in the positive direction or speeding up in the negative direction) are represented by "negative" acceleration.
The Vagus Nerve (Number 10 or X)
No, when anything is slowing down it is decelerating.
Vagus nerve; excessive stimulation causes bradycardia.
A car can be slowing down while still accelerating if its speed is decreasing but the direction of its velocity is changing. For example, if a car is moving in a curve, its speed may be decreasing but it is still accelerating towards the center of the turn. This is known as centripetal acceleration.
False. An object is slowing down when its speed is decreasing, which means it is decelerating, not accelerating in the direction of motion.
It is decelerating any time it is not accelerating or is stopped. Decelerating means slowing down.
Could be bad u-joints in the driveshaft.
This depends on how you define your axes. Let's assume they're defined as normal (being positive is accelerating, negative is breaking, and for velocity positive is driving forward, negative is driving in reverse). Then of course, you are speeding up. This simply means the train was in reverse, but it's accelerating in the positive direction now.
An object that is accelerating is either speeding up or slowing down. If the acceleration is in the same direction as the velocity, the object is speeding up. If the acceleration is opposite to the velocity, the object is slowing down.
Logistic growth
No. Negative acceleration simply means it is accelerating in a particular direction.
One tire has a belt separation.