Well:
- Energy still has mass, therefore it´ll reflect some of the sunrays/light when it´s projected onto it (Since sunrays, have very little mass as well, the collision between these two will be considered an elastic collision, meaning no loss of energy causing the sunray to reflect). This means that you can see something shining (it´s where the reflected light is coming from). So you can see it upon creation .
- Creating something big as a spike (From Solf and Howard´s fight) from something that almost has no mass requires a lot of time. This time includes the amount of time where it starts to form and you see it forming due to the shadow.
- Same reason as earlier, since some of the sunlight is deflected, there will be a shadow on the ground (it won´t be very dark tho). You can see the shadow almost instantaneously since it´s created at the speed of light. The object cannot move at the speed of light in such a short amount of time (it can´t really move at the speed of light since it has mass now) and human reaction is faster than the speed the object with that mass will move.
Proof:
Light travels at a speed of 300000000 m/s.
Human reaction is around 80 ms= 0.08 sec
A person who is walking, the average speed is of 6 m/s.
So...If you create, for example, an object of 1 gram of mass. If you want to use the object to attack the person, the minimum speed you need it to reach will be the person´s speed. Therefore:
Final Speed = Initial Speed + Acceleration * Time
6 m/s = 0 m/s + Acceleration * 0.08 sec
Acceleration = 75 m/s^2
Now, according to the Second Law of Newton:
Net Force = Mass * Acceleration
Net Force = 0.001 kg * 75 m/s^2
Net Force = 0.075 N (Which equals to the weight around 7,5 grams)
In the Net Force, the Force you used on the mass is included, but also the air resistance force (the air resistance force will increase as the speed of the object increases) and some other forces that are wasted by doing work (the mass will be heated due to air friction. Also when things are heated, the volume tends to be greater than when it´s not heated and that can cause more air resistance force). Therefore, the force you need to push onto the 1 gram object will require at least 8 grams of force.
Of course, something of 1 gram can´t cause damage to a human body physically (Will be explained afterwards)
- An average human person can support a pressure of up to 10 kg/cm^2 (Equivalent to 100000 kg/m^2 = 100000 Pa) in extreme conditions (Not counting the atmophere pressure, which is of 101325 Pa).
Now, let´s say the sectional area of the 1 gram thing is of 1 mm^2 and you applied 8 grams of force onto it, the pressure the skin will suffer will be of:
8 grams/mm^2 = 0.008 kg/mm^2 = 0,8 kg/ cm^2
In extreme conditions, a person can support 10 kg/cm^2, that means that skin can at least support that amount of pressure.
If you want to stab throught the skin, you´ll require at least 10 kg/cm^2.
To everyone saying Kiyoshi is op, Kiyoshi is very defend-able with even normal biographies.
@ solf. In your fight with Howard, you were actually wrong, since Howard was moving, your spikes wouldn't have hit his eyes as the spikes rest at 0 and must accelerate whereas Howard is already moving forward/howards. He'd be hit yes, but not his eyes. In fact, that's completely impossible. They'd only hit his knees or ankles.
- Yard and Naruta.
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