Can someone pls explain how to answer these

Explanation:

Hook's law describes the force F a spring exerts on an object that is stretched or compressed by a distance x from its natural length and has spring constant k:

(1)

The force of gravity of an object with mass m and gravitational acceleration g is given by:

(2)

(a) To find the natural length l of the spring you can use the example 1 and 3 of the spring. Use equations 1 and 2 to get the following system of equations with two unknowns k and l:

To solve for k you can subtract the equations:

Now plug in k to solve for l:

(b) Now use Hook's law to find x:

(c) Do the same to find the mass m:

(d) Work is given by:

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.

0.93xc=0.93x3x10^8m/s

2.54cm is 1 inch

360seconds i 1 hr