Answer:
(A) She needs to move the decimal point by 3 places
Answer:
![U_k = 0.113](https://tex.z-dn.net/?f=U_k%20%3D%200.113)
Explanation:
using the law of the conservation of energy:
![E_i -E_f=W_f](https://tex.z-dn.net/?f=E_i%20-E_f%3DW_f)
![\frac{1}{2}Kx^2=NU_kd](https://tex.z-dn.net/?f=%5Cfrac%7B1%7D%7B2%7DKx%5E2%3DNU_kd)
where K is the spring constant, x is the spring compression, N is the normal force of the block,
is the coefficiet of kinetic friction and d is the distance.
Also, by laws of newton, N is calculated by:
N = mg
N = 3.35 kg * 9.81 m/s
N = 32.8635
So, Replacing values on the first equation, we get:
![\frac{1}{2}(138)(0.123)^2= (32.8635)U_k(0.281m)](https://tex.z-dn.net/?f=%5Cfrac%7B1%7D%7B2%7D%28138%29%280.123%29%5E2%3D%20%2832.8635%29U_k%280.281m%29)
solving for
:
![U_k = 0.113](https://tex.z-dn.net/?f=U_k%20%3D%200.113)
Answer:
Hello, I believe it would have a negative charge considering protons have a positive charge while elctrons have a negative charge
Explanation:
It holds A. Less water than when it is warmer.
Light that enters the new medium <em>perpendicular to the surface</em> keeps sailing straight through the new medium unrefracted (in the same direction).
Perpendicular to the surface is the "normal" to the surface. So the angle of incidence (angle between the laser and the normal) is zero, and the law of refraction (just like the law of reflection) predicts an angle of zero between the normal and the refracted (or the reflected) beam.
Moral of the story: If you want your laser to keep going in the same direction after it enters the water, or to bounce back in the same direction it came from when it hits the mirror, then shoot it <em>straight on</em> to the surface, perpendicular to it.