a 28 kg mass suspends from a light rope 18 m long & is held to one side by the horizontal force, f, as shown below.
the distance, s, 11.1 m. find f.

215.15 N

Explanation:

If we draw a free body diagram of the mass we will have the following:

(1)

(2)

Where is the tension force of the rope, the mass, the acceleration due gravity and is the weight.

On the other hand, we can calculate as follows:

Where and

(3)

Now, we firstly need to find from (2):

(4)

(5)

Substituting (5) in (1):

(6)

Finally:

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.

i don't understand. explain it clearly