An elevator of mass 3000 kg is ascending at a steady speed of 2.0 m/s. what is the
force in the cable supporting the elevator?

Explanation:

When the elevator is moving at uniform speed then we can say that acceleration of the elevator is zero

so we will have

here T = tension in the supporting cable

mg = weight of elevator

now if the elevator is moving with steady speed

then we will have

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.

d. platinum would have the greatest temperature increase because it has the lowest specific heat.