Recent content by vanihba

  1. V

    What is the physics behind magnetorquers and reaction wheels?

    What is the physics behind magnetorquers and reaction wheels which help in satellite attitude determination and control?
  2. V

    Magnetorquers and reaction wheels?

    What is the physics behind magnetorquers and reaction wheels which help in satellite attitude determination and control?
  3. V

    Maximum Height of Two Balls After Collision in Air

    By raising the ball to a ht. of ho, you give it a potential energy change of mg(ho), which will be converted to Kinetic energy when the ball comes down mgho = 1/2m(v1^2), thus u get v1. Find final velocities. use potential energy again after that.
  4. V

    Change in mechanical energy of a bullet

    Potential energy in above problem is essentially gravitational energy..(you can neglect other forms they don't play much of a role here)..and anyway there is NO CHANGE in gravitational energy if the bullet went horizantally through, right?? as h is same for both initial and final situation. So...
  5. V

    Electricity Problems - conductive spheres

    Connecting two spheres will cause charge flow till both have equal potentials. In short answer is C and C.
  6. V

    What is the required speed for the last 2 laps to qualify for the race?

    You r averaging the speed for individual laps.. (150 + v)/2 = 180, and thus v=210 Actually avg. speed = total distance/total time = (150*2d + v*2d)/[2d/150 + 2d/v] = 180 In short you r assuming that he takes equal time to complete the first 2 laps and the last 2 laps, which is incorrect.