Answer:
Angle of incidence
Explanation:
When light is reflected from a surface, the angle of incidence is always equal to the angle of reflection, where both angles are measured from the path of the light to the normal to the surface at the point at which light strikes the surface. This equality is known as the law of reflection.
Answer:
If x-rays get in touch with our body tissues, they create a picture of a metal film. The high energizing rays are unable to penetrate soft tissue, such as skin and organs and travel through the laser. The places where the x-rays pass soft tissues are Black areas of an X-ray.
Because it also can be apart of the milky way galaxy
Answer:
d = 25.51 m
Explanation:
the law of the conservation of energy says that:
![E_i - E_f = W_f](https://tex.z-dn.net/?f=E_i%20-%20E_f%20%3D%20W_f)
where
is the inicial energy,
is the final energy and
is the work of the friction.
so:
= ![\frac{1}{2} MV^2](https://tex.z-dn.net/?f=%5Cfrac%7B1%7D%7B2%7D%20MV%5E2)
![E_f = 0](https://tex.z-dn.net/?f=E_f%20%3D%200)
where M is the mass and V the velocity.
also,
![W_f = U_kNd](https://tex.z-dn.net/?f=W_f%20%3D%20U_kNd)
where
is the coefficient of kinetic frictio, N is the normal force and d is the distance.
therefore:
![\frac{1}{2}MV^2=U_kNd](https://tex.z-dn.net/?f=%5Cfrac%7B1%7D%7B2%7DMV%5E2%3DU_kNd)
also, N is equal to the mass of the hockey puck multiplicated by the gravity.
replacing:
![\frac{1}{2}m(5)^2=(0.05)(m(9.8))(d)](https://tex.z-dn.net/?f=%5Cfrac%7B1%7D%7B2%7Dm%285%29%5E2%3D%280.05%29%28m%289.8%29%29%28d%29)
canceling the m:
![\frac{1}{2}5^2=0.05(9.8)(d)](https://tex.z-dn.net/?f=%5Cfrac%7B1%7D%7B2%7D5%5E2%3D0.05%289.8%29%28d%29)
solving for d:
![d = \frac{\frac{1}{2}5^2 }{0.05(9.8)}](https://tex.z-dn.net/?f=d%20%3D%20%5Cfrac%7B%5Cfrac%7B1%7D%7B2%7D5%5E2%20%7D%7B0.05%289.8%29%7D)
d = 25.51 m