Q. A cannon tilted upward at = 33 fires a cannonball with a speed of 99. At that instant, what is the component of the cannonball's velocity parallel to the ground?
Q. The displacement of a wave traveling in the positive x-direction is D ( x, t ) = ( 3.5;{rm cm} ) {rm sin} ( 2.7x-124t ) , where x is in m and t is in s. What is the frequency of this wave?