# Search results

1. ### Finding the Directionality of a Sound

I recently performed a noise lab and I am required to write a program to find the room constant of the room where the data was collected. Basically I would be using the formula: Lp = Lw + 10log(Q/[4*pi*r^2] + 4/R) Where Lp is the sound pressure level which was collected during the...
2. ### Mass Balance of Biomass Question

The Problem: Bio fuels are receiving more and more attention. For biomass waste materials (cellulose, manure etc.), the first step in the process is typically to convert the biomass to sugar (glucose, C6H12O6). This first step is only able to produce 0.1 g glucose per g of biomass. The...
3. ### Find the Differential Equation Relating Input Voltage and Output Voltage

Hey all, I'm stuck on a dynamic systems question, it's attached as a jpeg I started off by writing nodal equations for each node: Node 1: 1/R1(ei-eA)=C1D(eA-eo)+1/R2(eA-eB) Node 2:1/R2(eA-eB)=C2D(eB) I know that I have to isolate for ei and eo but I'm really confused with...
4. ### Using Stress/Strain Curve to Find Yield Strength and Modulus of Elasticity

Hey guys, I recently did a compression lab with different materials (wood and pvc pipe) and I have to plot the stress/strain curves given the data collected, as well as find yield strength (0.2% offset), ultimate compressive strength, and modulus of elasticity. I've already calculated...
5. ### Writing Nodal Equations for a Thermal System

So I have to write out nodal equations for a system that I was given, and I started off by drawing out the flow diagram to see where everything was. I'm having trouble starting the nodal equations though. The attachment has 2 diagrams: figure 1 is the correct diagram that models the thermal...
6. ### Need help with Laplace's Equation

Homework Statement Determine whether each of the following functions is a solution of Laplace’s equation uxx + uyy = 0. x^3 + 3xy^2 ux=3x^2 uxx=6x uy=6xy^2 uyy=6x 6x+6x=12x and is therefore not a solution Did I do that right? I'm just learning about this topic and it's...
7. ### Finding a Limit Using L'Hopital's Rule

Homework Statement lim x→∞ of ((x^3+2x-∏)^(1/3))-x Homework Equations L'Hopital's Rule: If it is an indeterminate form, take the derivative of the top and bottom until you do not get an indeterminate form anymore. The Attempt at a Solution lim x→∞ of ((x^3+2x-∏)^(1/3))-x...
8. ### Using a Riemman Sum to find the area under a curve (n intervals, left endpoint)

Hello, I'm having a bit of trouble calculating the area under the curve of x^2 on the interval x=-3 to x=1. The question says that there I have to use n subintervals and left endpoints. Relevant Equations Δx=b-a/n xi=a+(Δx)(i-1) -its i-1 because we're using a left endpoint, otherwise...
9. ### Finding the best interval of solutions for N (using epsilon)

The problem is: lim as x→- ∞ (-5x/x-2)=-5 And I have to find the best interval of solutions for N Relevant equations: if x>N then |(-5x/x-2)-(-5)|<ε My attempt: |(-5x/x-2) - (-5)|<ε |-10/x-2|<ε x-2< 10/ε as x→-∞ we can assume that x-2<0 x-2<10/ε x< (10/ε)+2...
10. ### Altitude of a Rocket Launched into Space

The Problem: A 4.60 kg rocket is launched directly upward from Earth at 9.00 km/s What altitude above the Earth's surface does the rocket reach? Relevant Equations: v = √ (2GM/r) The Attempt: m = 4.60 kg v = 9km/s = 9000m/s G = 6.67 x 10^-11 9000^2 = 2(6.67^-11)(4.60)/r...
11. ### Force Constant of Surgical Tubing

The Problem: I found the force constant of surgical tubing for a catapult I have to make for physics class. However I discovered that I have to reduce the length of the tubing a few centimetres to get a longer range for the projectile. Will reducing the length change the force constant...
12. ### How To Calculate Catapult Trajectory

I have an assignment where I have to build a catapult that is able to launch a bean bag any distance between 8-12 metres. My teacher will give me a random distance on the day it's due, and I have to be able to adjust the catapult in order for it to launch that distance. I'm having a bit of a...