Rough snow has the following coefficients of friction: ObjectStatic FrictionKinetic Friction
Rough Snow0.10.05
What is the Force of Friction that the sled expriences as Marisa is trying to stop it moving on her patch of rough snow?

a
2.45
b
-0.25 N
c
-2.45 N
d
49.05 N

The two most prominent wavelengths in the light emitted by a hydrogen discharge lamp are 656(red) and 486 (blue). light from a hydrogen lamp illuminates a diffraction grating with 500 lines per mm, and the light is observed on a screen 1.50 behind the grating. what is the distance between the first-order red and blue fringes?