## What if there was more than one time dimension?

Max Tegmark has argued that if there is more than one time dimension, then, the behavior of physical systems could not be predicted reliably from knowledge of the relevant partial differential equations. In such a universe, intelligent life capable of manipulating technology could not emerge.

## Can you be in two dimensions at once?

You can’t really enter into “another dimension” as science fiction would have you believe. Instead, dimensions are how we experience the world. But some aspects actually suggest to one expert, not one but two dimensions of time. The normal three dimensions including up-down, left-right, forward-back, and space-time.

**What is the meaning of relativistic mechanics?**

In physics, relativistic mechanics refers to mechanics compatible with special relativity (SR) and general relativity (GR). It provides a non-quantum mechanical description of a system of particles, or of a fluid, in cases where the velocities of moving objects are comparable to the speed of light c.

### What is the difference between classical mechanics and relativistic mechanics?

Classical mechanics uses common sense notions of how matter and forces exist and interact. It assumes that matter and energy have definite, knowable attributes such as location in space and speed. Non-relativistic mechanics also assumes that forces act instantaneously (see also Action at a distance).

### Does the 2nd dimension exist?

There’s no such thing as a first, second, and third dimension. To say that something has a certain number of dimension is (very roughly speaking) to answer the question “How many coordinates do I need to uniquely identify a point on this something?” Like you say, in 3D space we need 3, x,y,z.

**What is the 5th dimension?**

The fifth dimension is a micro-dimension which is accepted in physics and mathematics. It’s here to have a nice and seamless tie between gravity and electromagnetism, or the main fundamental forces, which seem unrelated in the regular four-dimensional spacetime.

#### Does time exist in the fourth dimension?

Many physicists, including Einstein as part of his ‘Special Theory of Relativity’, proposed that the fourth dimension is time. He said time should be a dimension like the other spatial dimensions because space and time are inseparable.

#### What is the need of relativistic mechanics?

In physics, relativistic quantum mechanics (RQM) is any Poincaré covariant formulation of quantum mechanics (QM). This theory is applicable to massive particles propagating at all velocities up to those comparable to the speed of light c, and can accommodate massless particles.

**What is the significance of relativistic quantum mechanics?**

The aim of relativistic quantum mechanics is to describe the finer details of the structure of atoms and molecules, where relativistic effects become nonnegligible.

## Which momentum is more accurate the classical or the relativistic momentum?

Relativistic momentum has the same intuitive feel as classical momentum. It is greatest for large masses moving at high velocities, but, because of the factor γ, relativistic momentum approaches infinity as u approaches c.

## Why is quantum mechanics different from other mechanics?

Quantum mechanics differs from classical physics in that energy, momentum, angular momentum, and other quantities of a bound system are restricted to discrete values (quantization), objects have characteristics of both particles and waves (wave-particle duality), and there are limits to how accurately the value of a …