Hello. I need help with the following problem for calculatingthe frequency of a vibrator. I asked for helped previously andrecieved an answer of 47.77, but this was incorrect. There is aformula that was included with this problem, but I tried using itand I can't get it to work. The question and formula are below:

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I need to find the time at which the rock lands, not the time atmaximum height. It is part C of the below problem.

Consider a rock that is thrown off a bridge of height 11 m at anangle ? = 22Â° with respect to the horizontal as shown in the figureabove. If the initial speed the rock is thrown is 13 m/s, find thefollowing quantities:

(a) The time it takes the rock to reach its maximum height. (I havefound this - 0.4969seconds)

(b) The maximum height reached by the rock. (I have also found this- 12.21m)

(c) The time at which the rock lands.

This is where I am stuck. I have tried doubling the time at maximumheight (2X0.49969=0.9938s) as well as plugging back into the yfequation & solving for t, but everything I try keeps comingback as incorrect. So far I have tried (all incorrect):
0.9938
1.995
1.910
2.152

I only have one chance left & need the correct answer in orderto find the rest of the problem! Please help!

The block in the figure below lies on a horizontal frictionlesssurface and is attached to the free end of the spring, with aspring constant of 35 N/m. Initially, the spring is at its relaxedlength and the block is stationary at position x = 0. Then anapplied force with a constant magnitude of 3.4 N pulls the block inthe positive direction of the x axis, stretching the spring untilthe block stops.
Assume that the stopping point is reached.

http://www.webassign.net/hrw/7-10a.gif

(a) What is the position of the block?

( for this I worked out an equation from the worknet =Ke formula. Iused an anti derivative to find the spring force into the equationand then i came out with an equation

Fx - (k(x^2/2)= KEf

I know i am supposed to get the x by itself but i have no ideahow.

and I already tried f=kx to x=f/k, to get a number that is .0678which was way off can anyone help me outon this problem I amstumped

(b) What is the work that has been done on the block by the appliedforce?

(c) What is the work that has been done on the block by the springforce?

During the block's displacement, find the following values.
(d) The block's position when its kinetic energy is maximum.

e) The value of that maximum kinetic energy.

sorry i didnt post a clear picture. all i need is two parts now:F and G but here is the whole question, just so you know what isinvolved:

The output voltage of an AC generator is given by Îv = 102 V sin(27Ït). The generator is connected across a 0.007 H inductor. Findthe following.

a.) frequency of the generator = 13.5 Hz

b.) rms voltage across the inductor = 72.12 V

c.) inductive reactance = .594 [Ohm]

d.)rms current in the inductor = 121.4 A

e.) maximum current in the inductor 171.7 A

f.) average power delivered to the inductor = ?

g.) Find an expression for the instantaneous current. (Use thefollowing as necessary: t.) = ?

h.) i figured this one out and its not relevant

i managed to work through most of it but i just cant get F andG. any help or guidance would be very much appreciated. thankyou!

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