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# (Solved): (5 points) Block 1 rests on top of block 2 as shown in the figure at right. A spring is attached to ...

(5 points) Block 1 rests on top of block 2 as shown in the figure at right. A spring is attached to block 2, driving oscillations across a frictionless horizontal surface. These oscillations have a period of

T=1.5s

. Block 1, which moves with block 2 due to static friction, begins to slip when the amplitude is increased to

A=40cm

. What is the coefficient of static friction,

\mu _(s)

, between bl (5 points) The energy diagram at right is for the molecular bond in a

HCl

molecule. In a very simplified model of the oscillations in the bond, we assume that the

Cl

atom is at rest while the

H

atom oscillates because the

Cl

atom has so much more mass than the

H

atom. If the mass of a hydrogen atom is 2

m=1.67\times 10^(-27)kg

, estimate the frequency of its oscillation,

f

. Pay careful attention to the units on the graph (the bond length units are

nm

, not

m

! Potential energv (

I

) 4 3 2 1

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