The assembly starts from rest and reaches an angular speed of 137 rev/min under the action of a 31-N force T applied to the string for t seconds. Determine t. Neglect friction and all masses except those of the four 3.9-kg spheres, which may be treated as particles.

Abatter hits the baseball a with an initial velocity of v0 = 110 ft/sec directly toward fielder b at an angle of 23° to the horizontal; the initial position of the ball is 2.2 ft above ground level. fielder b requires 0.44 sec to judge where the ball should be caught and begins moving to that position with constant speed. because of great experience, fielder b chooses his running speed so that he arrives at the “catch position” simultaneously with the baseball. the catch position is the field location at which the ball altitude is 8.4 ft. determine the velocity of the ball relative to the fielder at the instant the catch is made.

Amagnetic field applies forces on: a)static chargesb)moving chargesc)water flow

Awhite-blue star is hotter than a red star. select the best answer from the choices provided true or false