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What does a negative velocity mean? - MyTutor

What does a negative velocity mean? To understand this question, it is important to know that velocity has both a direction and a magnitude. The magnitude can be expressed by the unit m/s, however the direction is expressed by a vector.

What does the term terminal velocity mean? | MyTutor

Terminal velocity is the constant speed(in a particular direction) a body reaches when the forces are balanced, i.e. acceleration = 0 m s-2.

Explain what causes the conduction of impulses along a non ... - MyTutor

Explain what causes the conduction of impulses along a non-myelinated axon to be slower than along a myelinated axon.

What is escape velocity? | MyTutor

What is escape velocity? This is the minimum initial velocity required to move from a point to infinity in a gravitational field. Infinity is defined to have a potential, V of zero; this is the point where the gravitational field has no influence on the object and no force is acting on it due to the gravitational field (in theory).

What's the difference between velocity and speed? - MyTutor

Velocity and speed and vector and scalar quanities respectively. Vector quantities have both direction and magnitude (size), whilst scalars only have magnitiude. It is important to distinguish between the two because velocity refers to both how fast something is going and in which direction while speed only tells you how fast something is going.

Explain the formation of a meander. - MyTutor

Due to banks of sediment at the bottom of the river (which are deposited at times of low flow, that is, a low velocity and low discharge, meaning deposition increases), the river weaves around these alternating shallow and deeper sections (riffles and pools) on what was an initially straight channel.2.

Does a negative acceleration always mean that the object is ... - MyTutor

Acceleration is a vector quantity, (the rate of change of velocity), meaning it has both magnitude and direction. Hence, if a 2D car on a plane was accelerating towards the left (i.e negative acceleration) and its velocity was also to the left too (negative), the car would speed up NOT slow down regardless of the negatives.

How does myelination of neurones increase conduction velocity ... - MyTutor

Answers>Biology>A Level>Article How does myelination of neurones increase conduction velocity? Myelination is the production of a myelin sheath - a fatty, electrically insulating layer formed by Schwann cells wrapping around the axons of neurons. This sheath is not continuous, there are gaps between Schwann cells which are called nodes of Ranvier.

How does saltatory conduction work? | MyTutor

How does saltatory conduction work? Most axons in the human nervous system are myelinated, meaning they are enclosed in a myelin sheath, a fatty deposit created and maintained by Schwann cells that acts as an electrical insulator. There are small gaps in the sheath around 1-2 micrometers apart. These gaps are known as the nodes of Ranvier.