I am going to start to post weekly videos (hopefully?) on certain dot points / harder questions relating to HSC Physics syllabus.

I already have ideas and requests for the first few videos, but I would like ideas for videos from then on.

What questions / dot points would you like addressed?

I will NEVER, EVER do any long rote learning dot point cuz I really don't care society and the environment and Planck and Einstein and social and political forces..

Although my voice is soothing, I don't want to put anyone to sleep.

Ideas plz?

TYTY ]]>

a) the work done by each brake to produce this slowing up

b) how far the car will travel while this happens

2)Find the initial velocity of a 0.40 kg projectile if, after it embeds itself in a 3.6kg block, the combined mass moves off at 20m/s.

3)An object, initially at rest, travels a distance 'd' in a total time 't' at a constant acceleration. What is the total time taken for the object to travel '16d' from rest at the same acceleration?

THANK YOU :smile: ]]>

1. the modified field equation requires the pressure is negative, some people may feel uncomfortable, however this is actually a kind of secular bias. In fact both classical mechanics and relativity don’t really reject negative pressure, only appears in the equation of motion the pressure’s derivative in classical mechanics and the size of the pressure can be any value, do not rule out the negative. In relativity not only the size of the pressure but also pressure’s derivative appears in the equation of motion, which requires pressure value can not be arbitrary, but isn’t ruled out the negative pressure yet. It is the emergence of negative pressure that leads to the continuous generation of material, as the field equation is applied to an celestial object dm + P dv = 0, the increase of mass of celestial bodies comes from the work done by the negative pressure, new matter arises doesn’t mean the infringement to the law of energy conservation. Further calculation dm=3Hmdt.

2. Although galaxies or celestial objects increase with universal expansion, the angular velocity of their rotation or revolution keeps constant, i.e. periodic invariant, like using a magnifying glass to watch the circular motion, not only the radius of the orbit but also the speed is amplified and the period constant, all energy come still from the work done by the negative pressure. Orbital expansion can completely be derived from geodesic equations rather than additional assumptions. The new theory has important guiding significance in solar physics, space physics, geophysical and seismic genesis and so on

3. Similar to the big bang, the new theory still explain the microwave background radiation for comprehensive reflection of light after red shift emitted from far bodies whose distances can not be distinguished in our instrument, but do not think from so-called final scattering surface. Compared with vast space galaxies amount to molecules, these molecules form extremely thin and deep gas, in other words our universe is equivalent to a cavity, so the light from far has black-body spectrum. But the big bang can not rationally explain the black-body spectrum, in the big bang frame universal temperature is decreased, the so-called thermal equilibrium didn’t exist at all.

4. The rapid generation of matter (such as the big bang) is contrary to common sense, but slow generation is not contrary to common sense, should be allowed, and any absolutization to physical laws is never a scientific attitude.

6. Space-time is infinite, no longer rely on the so-called critical density, the universe's expansion and contraction cycle, alternately, the scale factor meets the sine function R(t)=Csinat, excluding the irrational expansion: big bang --- decelerating ---- inflation --- decelerating ---accelerating .......

The new relation between distance and redshift derived from the modified field equations is highly consistent with observations, and universal expansion is still decelerated and the shoddy conclusion that expansion of universe is accelerating no longer exists. In the new theory sometime in the past the scale factor R (t) =0, at which mass of any body was zero, the absolute temperature of universe was also zero, with mass to increase temperature gradually rose to meet mass-luminosity ratio. That is to say, universal temperature is higher and higher but not lower and lower, and the big bang fireball didn’t exist at all.

7. The new theory has unified the dark matter and dark energy, the modified gravitational field equation is including all effects of dark matter and dark energy and is a complete field equations. Due to negative pressure has the multiple properties of pressure, dark matter and dark energy, dark matter and dark energy arise no longer, all effects of dark matter and dark energy are fully absorbed in the negative pressure. The more important thing is that the negative pressure can be solved through the gravitational field equation, so reduce three cosmological parameters. ]]>