Physics
posted by Tj .
Consider an ideal spring that has an unstretched length l0 = 3.3 m. Assume the spring has a constant k = 23 N/m. Suppose the spring is attached to a mass m = 6 kg that lies on a horizontal frictionless surface. The springmass system is compressed a distance of x0 = 1.6 m from equilibrium and then released with an initial speed v0 = 4 m/s toward the equilibrium position.
(a) What is the period of oscillation for this system?
(b) What is the position of the block as a function of time. Express your answer in terms of t.
(c) How long will it take for the mass to first return to the equilibrium position?
(d) How long will it take for the spring to first become completely extended?

i got this question
did you got q4 & 5 
only number 5 wich is (5/2)*R

the half loop one question and the spring block with friction one?

My bad.
I don´t know the other one
Half loop N= (k*d^2/m2*g*R)*(m/R) 
ocw.mit.edu/courses/physics/801tphysicsifall2004/assignments/ps07sol.pdf
check q4 plug in your values, i got different values
i am figuring out the 2nd part 
did you got vertical spring one?

did you get the 1st one.. plzz help anyone? plz

does anybody knows the last one(8th question) plzz. hop.

8th
a)(C_1*r*v_x)/m
b)g(C_1*r*v_y)/m
c)u*e^((C_1*r*t)/m)
d)((m*g)/(C_1*r))((m*g)/(C_1*r))*e^((C_1*r*t)/m)
e)4.6*(m/(C_1*r))
f)0
g)(m*g)/(C_1*r) 
did anyone got the vertical spring one?

q:1

@mk did you got the spring block question?

kunoi ,, vertical one please.!! tried many times plzz help!

question 3rd not getting b,c and d
plzz help 
We release an oil drop of radius r in air. The density of the oil is 720 kg/m3. C1 and C2 for 1 atmosphere air at 20∘ C are 3.40 × 10−4 (kg/m)/sec and 0.93 kg/m3, respectively.
How small should the oil drop be so that the drag force is dominated by the linear term in the speed (in lectures we called this Regime I). In this regime, the terminal velocity is mg/C1r. [m is the mass of the drop].
r<<x
find x ??
anyone? 
r << 1.3e4

julia, the grader is not accepting the answer

1.66*10^4

yeah i got it,, forgot to take the cube root.
the 8th one plz 
not getting the 3rd one and the 8th one.
got the first part of 3rd but not getting the rest.. plzzz help 
does anybody know the 8th one?

can u give me brief equations on solving this oil drop?

fine its here
r^3=3*(C1)^2/(4*pi*density*C_2*g)
solve by putting the values given and then,
TAKE THE CUBE ROOT OF THE VALUE YOU OBTAINED.
***the end*** 
oscillating block ans D) 1.2
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