Recent content by jmc

Yes RUber, I realized that earlier as I was ensuring all probs summed to 1. Much faster method for solving!

Thank you It makes sense to incl. the probability of not hitting the target in each case for part B. I don't know why I didn't catch on to that before. For what I understand, it should be calculated as such: Pr{A & B & Not C} + Pr{A & Not B & C} + Pr{Not A & B & C} =...

Homework Statement Three tanks are sent to shoot a certain target. Each tank is to shoot one round. The probabilities of a tank's round hitting the target are 1/2, 2/3 and 3/4 for tanks A, B, and C respectively. Assuming independence of A, B and C hitting, find the probability that: a. rounds...

Homework Statement electric field polarization for a given antenna is expressed as: E_i = (a_x + a_y) E (r, theta, phi) The unit vector along the antenna polarization is found as u_a = 1/Sqrt(2) (a_x + a_y)2. Question Where/how is the 1/Sqrt(2) found to resolve those other 2 vectors into a...

I have tried to sketch it. What I see is.the top portion of the sphere, sliced where 20 deg from the X-axis meets the edge of the sphere. But how to convert that to a steridian, I still don't see. Thank you

Homework Statement For a sphere of radius r, find the solid angle Ω in steradians defined by spherical angles of: a.) 0°≤θ≤ 20°, 0°≤ø≤360°; Homework Equations dA = r2 sin dθ dø (m2) dΩ = dA / r2 = sin dθ dø (sr) The Attempt at a Solution I think I understand what a steradian (sr)...

Homework Statement Req'd to calculate power avail for propulsion. Given 2x 475kW fuel cells, 6400 kWh lead-acid battery. Ships machinery power requirement is 1100 kW at any given time, and battery max discharge rate is 1.2 kW/kWh. Homework Equations I'm not sure I fully understand the how...