5: Two masses, 4 kg and 9 kg respectively, are attached to opposite ends of an ideal spring. The system sits on a frictionless table. If I push the masses together (against the spring) and release the
system, then I find the 4 kg mass has a speed of 3 m/s
A:
What is the speed of the 9 kg mass after release?
B:
What was the amount of energy stored in the spring before release?
C:
Suppose repeat this experiment on a table with friction.
Would the momentum be conserved
why or why not?
Would the energy of the system be conserved why or why not?

If you have a bowl with six apples and you take away four, how many do you have? anyone take a guess and post it. lol getting rid of my account might as well do it with some fun

Electroplating is a way to coat a complex metal object with a very thin (and hence inexpensive) layer of a precious metal, such as silver or gold. in essence the metal object is made the cathode of an electrolytic cell in which the precious metal cations are dissolved in aqueous solution. suppose a current of 480.ma is passed through an electroplating cell with an aqueous solution of agno3 in the cathode compartment for 46.0 seconds. calculate the mass of pure silver deposited on a metal object made into the cathode of the cell. round your answer to 3 significant digits. also, be sure your answer contains a unit symbol. ×10μ

The focal length of a relaxed human eye is approximately 1.7 cm. when we focus our eyes on a close up object, we can change the refractive power of the eye by about 16 diopters. (a) does the refractive power of our eyes increase or decrease by 16 diopters when we focus closely? explain. (b) calculate the focal length of the eye when we focus closely.