Physics questions on mechanics: Explain why a scientist on board the ISS...

...experiences apparent weightlessness? Physics questions on mechanics: Explain why a scientist on board the International space station experiences apparent weightlessness.

In a mass spring system, the mass can oscillate as shown. The mass is 2kg, and oscillates with a period of 1.2 secs, show that the stiffness of the spring system is about 55N/m

The bonds in atoms in a particular solid. have the same stiffness and the mass of the system is 4.7 times 10 to the power of -26. kg. Calculate the frequency of the oscillation of the atom.