<span>Rays will follow the law of reflection, so the angle of reflection will be 35 degrees. If a</span> light ray strikes a smooth surface, the reflected ray will bounce off the surface with the same angle the ray hits the surface. In other words, the angle of incidence is the same of angle of reflection, which is 35 degrees. If the surface is not smooth, the reflected ray might diffuse in all directions.
<span>Since the wheel start from rest. angular acceleration,
θ=1/2αt²
14=1/2α x 8.7²
α= 0.3699 rad/s²
moment of inertia of loop= mr²= 4.1x0.37=1.517 kgm²
torque=T= lα
T= 0.5611Nm= 0.56Nm to significant figure
Disc
moment of inertia of disc= 1/2mr²
Required torque value= 0.28Nm
So,
I= 1/2X 4.1X 0.37²= 0.280 Kgm²
T= Iα = 0.280 X 0.3699= 0.10 to two significant figure</span>
Answer:
<em>Reaching activation energy</em><em> is necessary because reactants require a </em><em>minimum</em><em> </em><em>amount of energy</em><em> start breaking a</em><em> chemical bond.</em>
Explanation:
Activation energy is the minimum amount of energy required by the reactants to initiate a chemical reaction. The unit of activation energy is joule or kilo joule per mole or kilo calories per mole. Activation energy depends on temperature.
The temperature dependence of activation energy is given by Arrhenious equation. Activation energy is a threshold value of energy. For any reaction to occur this is the minimum amount of energy required.
Answer:
25 joules
Explanation:
Work Done = Force × Distance
Force = 50N
Distance = 0.5m
Therefore, the amount of work done is 25Nm which is 25 joules
The book has no movement and there is a force that is put in to the book.
