Search results

  1. HRubss

    Calculating Flux over the closed surface of a cylinder

    I wanted to check my answer because I'm getting two different answers with the use of the the Divergence theorem. For the left part of the equation, I converted it so that I can evaluate the integral in polar coordinates. \oint \oint (\overrightarrow{V}\cdot\hat{n}) dS = \oint \oint...
  2. HRubss

    Determining the final velocity and acceleration magnitude traveling along an arc

    Problem Statement: The motorcycle is traveling at 40 m/s when it is at A. If the speed is then decreased at v'=-(0.05s)m/s^2, where s is in meters measured from A, determine its speed and acceleration when it reaches B. I attached a picture of the problem. Relevant Equations: S = S_0 + v_0(t)...
  3. HRubss

    Medical What causes the risks of taking steroids?

    I understand that anabolic steroids are a synthetic modification of testosterone, the natural body hormone. My question is, are the risks of taking steroids caused by defects in synthesizing the hormone or is it because of how the human body works to counteract the effects of adding more...
  4. HRubss

    Specific Heat Problem, not getting the correct answer

    Homework Statement A copper pot with a mass of 0.500 kg contains 0.170 kg of water, and both are at a temperature of 20.0°C. A 0.250-kg block of iron at 85.0°C is dropped into the pot. Find the final temperature of the system, assuming no heat loss to the surroundings. Homework Equations Q =...
  5. HRubss

    Radius of largest possible loop of an Airplane.

    Homework Statement A 2250 kg airplane makes a loop the loop (vertical circle) at a speed of 320 km/hour. Find (a) the radius of the largest circular loop possible and (b) The force on the plane at the bottom of this loop. Homework Equations F = m*a Centripetal Force = m * (v2)/r "Critical...
  6. HRubss

    Projectile motion HW check

    Homework Statement A football is kicked from the ground at an angle of 40° to the ground. It travels 42m and just passes over the goal post which is 3m high. What was the inital velocity of the football? Homework Equations vfinal2 = vinitial2 +2a(yfinal-yinitial) The Attempt at a Solution...
  7. HRubss

    Free-fall problem check

    Homework Statement A man stands on the edge of a roof 55m above the ground, he throws a stone upward and drops a second stone at the same time. If the dropped stone hits the ground 4.4s before the stone that was thrown upward, what was the initial velocity of the first one? Homework Equations...
  8. HRubss

    Constant acceleration problem

    Homework Statement A car, length 2.4m, traveling at 26m/s wants to pass a large truck, length 12m, also traveling at 26m/s. If the car can accelerate at 4.4m/s2, how much time will it take the car to pass the truck (note the back of the car has to be in front of the truck)? How far will the car...
  9. HRubss

    Tips on understanding Calculus?

    So I am currently planning to major in Mechanical Engineering which is heavily involved with Math. I'm taking Calculus 1 this semester and so far I'm doing just above average on all my test. (All B's and 1 A for my limits exam). So far so good right? Eh, I only excel because I just know how to...
  10. HRubss

    Stuck on a question from Precalculus 2

    Homework Statement "A small radio transmitter broadcasts in a 25 mile radius. If you drive along a straight line from a city 30 miles north of the transmitter to a second city 33 miles east of the transmitter, during how much of the drive will you pick up a signal from the transmitter?"...
  11. HRubss

    Applying Physics to Boxing, does speed create power?

    Hello! Quick little background to my current question.. Whenever I would spar during boxing practice, I would always tire myself out from trying to "punch harder" (using all of my energy and trying to exert it on to my sparring partner). One day, a veteran boxer advises me on how I can perform...
Top