Recent content by mikefitz

r1=20,000 r2=15,000 r3=25,004.7 r4=40,000 r2&r3 in parallel= 9,375.5 20,000+9,375.7+40,000=69,375.5 10=I(69,375.7) I=.000144A ??

Homework Statement http://img267.imageshack.us/img267/8159/untitled3ct1.gif Find the current drawn. Homework Equations V=IR R1+R2+Rn 1/ (1/R1)+(1/R2)+(1/R3)+(1/R4) The Attempt at a Solution R1=20,000ohms R2=70,000ohms R3=96,7000ohms R4=40,000ohms 1/...

gah i was half working on another problem while typing this one out, sorry for the stupid typo; thanks for the response

http://img208.imageshack.us/img208/8093/untitledrp9.png i understand how the 'k' and 'w' values were calculated in the above problem. what i do not understand is why 134 s and 20.9m are being take to the -1 power. is the 20.9m being added because the problem states the wave travels in the -x...

Homework Statement Buoyant force. A block of wood floats in oil with 90.0% of its volume submerged. What is the density of oil? The density of the block of wood is 0.67 g/cm3. Homework Equations buoyant force = pgV The Attempt at a Solution p(oil) V(oil)=p(h20) V(h20)...

http://img207.imageshack.us/img207/5524/untitledll1.png what I'm looking for is 1. the total energy of the sphere, and 2. the height of the ball after it has traveled up the incline. i have some questions however. First, i understand that total energy = KE+PE. looking at the solution...

http://img208.imageshack.us/img208/392/untitledsx2.png this one seems so simple...i know the answer is 3 and 4; however, I do not know how my book came to that conclusion. can anyone explain to me exactly what is going on in the above diagram? Thanks

Homework Statement A uniform door weighs 50.0 N and is 1.0 m wide and 2.6 m high. What is the magnitude of the torque due to the door's own weight about a horizontal axis perpendicular to the door and passing through a corner...

The maximum speed of a child on a swing is 4.9 m/s. The child’s height above the ground at the lowest point is 0.7 m. How high above the ground is he at his highest point? http://img208.imageshack.us/img208/9949/untitledyx0.png Above is the work done to solve the problem. I don't understand...

Homework Statement 2. A 45-N lithograph is supported by two wires. First wire makes a 15 degrees angle with the vertical and the second one makes a 25 degrees angle with the vertical. Find tension in the second wire. I already have the answer to this problem, what I would like is some...

from my book Qc/Qh = W/Qh - 1 262.54999/294.15 = (W/294.15)-1 1.89=W/294.15 W=556.699 J Why is this wrong?

for KE do I just say that delta E = 1/2mv^2 + mgh = W = eQ ? .5(6kg)(5^2)= 75J mgh = 647.46J What do i do with these two values?

Homework Statement An engine works at 26% efficiency. The engine raises a 6-kg crate from rest to a vertical height of 11 m, at which point the crate has a speed of 5 m/s. How much heat input is required for this engine? Homework Equations e=work output / heat input = W/Qin W=Fd...

Homework Statement Calculate the maximum possible efficiency of a heat engine that uses surface lake water at 18.5°C as a source of heat and rejects waste heat to the water 0.100 km below the surface where the temperature is 4.3°C. Homework Equations e=1-Qc/Qh Q=cm(deltaT) The...

Homework Statement Suppose 0.50 mol of a monoatomic ideal gas is changed from state A to state D by one of the processes shown on the PV diagram of the figure below. http://img382.imageshack.us/img382/784/untitledsc4.png (This is my edited version of the image) (a) Find the...