Recent content by hks118

Homework Statement I am trying to calculate the natural frequency of a steel beam. Homework Equations I=1/12*W*T^3 Volume= T*W*L M0=V*ρ K=(3EI/L^3) Meff=(33/140)*M0+Mend ωn=√(k/Meff) The Attempt at a Solution This should be a simple plug and chug problem but I can't see what...

Thanks! makes much more sense now.

Homework Statement So I am designing the suspension for a small formula car. It's a pushrod suspension much like what is shown below: [PLAIN]http://f1-dictionary.110mb.com/Images/pullrod_poshrod_push.gif I am trying to find the required tubing diameter for the loads the car will experience...

Thanks! I can finish the problem in good conscience now

Homework Statement This is a part of a larger problem, but I'm unsure of one part. Picture a door with its center of mass in its geometric center. The door is hanging on two hinges, one at the top and one at the bottom. If the pivot point while measuring torques is considered to be the top...

Entered 8/3 and was right. Hate computers! haha

It is a computer program. I'll try with factions, it is very finicky sometimes...

Ok, so I started by evaluating the first function on the interval [-2,0] F(x)=2x F(0)=0 F(-2)=-4 0-(-4)=4 Then I evaluated the second function on [0,4] F(x)= 5x-x3/3 F(0)=0 F(4)=-1.3333333 Adding them gets me 2.6666666, which apparently is incorrect.

Homework Statement Evaluate the integral The Attempt at a Solution I tried splitting it into two integrals and adding the results, but it says that's wrong. I think it has something to do with the fact that the first part doesn't go all the way to zero...

Homework Statement A rectangular storage container with an open top is to have a volume of 10 m^3. The length of this base is twice the width. Material for the base costs $10 per square meter. Material for the sides costs $6 per square meter. Find the cost of materials for the cheapest such...

I got it, thanks! I appreciate the help.

Ok. so PEf is going to be zero, correct? and KEi is zero because the ball starts from rest. But I'm not given the mass, how can I figure out v? Do they cancel because they are constant?

Homework Statement A baseball is thrown from the roof of a building of height 21.2m with an initial velocity of magnitude 10.7 m/s and directed at an angle of 54.4 degrees above the horizontal. a. What is the speed of the ball just before it strikes the ground? Use energy methods and...

Homework Statement A ball of mass m=7kg attached to a massless string of length R=3 is released from the horizontal . Assume g=10m/s2 throughout the problem. a. Using thee Work-Kinetic Energy Theorem, find the magnitude of the velocity of the ball when it is at its lowest point (IE the...

Well, v=1/2bhl so I figured dv/dt=1/2bh(dh/dt)l. Or do I need db/dt and dl/dt as well?