Recent content by magma_saber

Homework Statement The problem says: u = 8[exp(y) - 1] Homework Equations The Attempt at a Solution Does this mean: 8ey-1 or 8ey-1

Homework Statement In one of the archaeological excavation sites, the artifact density (number of prehistoric artifacts per 10 liters of sediment) was 1.0. Suppose you are going to dig up and examine 50 liters of sediment at this site. Let r = 0, 1, 2, 3,… be a random variable that represents...

the region would be the triangle from y=4 to y=0 and x=0 and x=1 right? and is the limit 4-4x?

so its y-4/4? also are my limits for dy correct?

Homework Statement Find the centroid of the triangular region in the first quadrant bounded by the line 4x+y=4, the x-axis, and the y-axis. Homework Equations \int\int\deltadA xbar = My/M ybar = Mx/M The Attempt at a Solution Is the boundary for the dy from 0 to 4, and dx from 0 to...

nvm i solved it

Homework Statement One mole of iron has a mass of 56 grams and density of 7.87 g/cm^3. You have a long thin bar of iron, 2.0 m long, with a square cross section, 0.12 cm on a side. You hang the rod vertically and attach a 151 kg mass to the bottom, and you observe that the bar becomes 1.03 cm...

Homework Statement The inhabitants of a small island begin exporting beautiful cloth made from a rare plant that grows only on their island. Seeing how popular the small quantity that they export has been, they steadily raise their prices. A clothing maker from New York, thinking that he can...

Homework Statement A device with 8 balls each with a mass of 0.8 kg is attached to spokes with length of 1.4 m, radius of 0.7 m. A lump of clay of 0.2 kg falls on the at the location shown and is attached to a ball at 45 degree angle. Before the impact, the clay was at a speed of 5 m/s. It...

Homework Statement When row reducing and trying to find the pivots, does it matter if there is a zero on top? i.e.: 1 2 3 4 0 8 0 5 0 0 4 6 i know that the 1st and 2nd columns are pivots but is the 3rd column a pivot also?

it asks just for the torque for each force that is applied, i.e. F1, F2, F3, ect. After that, it asks for the net torque. for F1 i tried F*h and it was wrong. Would it be F*h*w, since the tail starts at w?

i tried that, its wrong. it says the z component. would that make a difference?

Homework Statement http://img3.imageshack.us/img3/5681/32832.jpg All seven forces have a magnitude |F| = 32 N. w = 10 m, h = 16 m, and d = 15 m. Calculate the z component of the torque relative to position A. Homework Equations T = r*F The Attempt at a Solution Not sure how to...

Homework Statement A spring has a relaxed length of 7 cm and a stiffness of 50 N/m. How much work must you do to change its length from 12 cm to 16 cm? Homework Equations 1/2*kss2 The Attempt at a Solution 1/2*50*(.16-.12)2 = 0.04 It shows the solution to be 0.14. It says the...

isn't young's modulus not dependent of the total mass? isn't it just based on the type of material such as iron. so it doesn't matter if the total mass is 100 kg or 1 kg, they should have the same young's modulus.