You want to use a rope to pull a 10-kg box of books up a plane inclined 30∘ above the horizontal. the coefficient of kinetic friction is 0.29. the rope pulls parallel to the incline.
what force do you need to exert on the rope if you want to pull the box with a constant acceleration of 0.50 m/s2 up the plane?

r=rho l/a where a is the area, l is the length and rho is resistivity so the greater the area the lesser the resistance thats why the earth pin is thicker bcos current follow the shortest path, so less resistive .

waves moving from a fast medium to a slow medium will experience a reflection as light travels more slowly than red light. total internal reflection occurs when the critical angle is.

c) up

hope this

what experimental evidence led scientists to change from the previous model to this one?

a few of the positive particles aimed at a gold foil seemed to bounce back.

the colors of light emitted from heated atoms had very specific energies.

experiments with water vapor showed that elements combine in specific proportions.

cathode rays were bent in the same way whenever a magnet was brought near them.