Two boys are swinging a long jump rope while a girl jumps in the middle. Despite its overall rotating motion, the jump rope is actually vibrating up and down in its fundamental mode while the boys circle their hands gently to keep the rope vibrating. To speed up the jump rope's vibration so that the girl has to jump more often, the boys must circle their hands more quickly and
A. reduce the tension in the rope.
B. increase the tension in the rope.
C. decrease the height (amplitude) of the arc formed by the swinging rope.
D. increase the height (amplitude) of the arc formed by the swinging rope.
Answer:B
Two boys are swinging a long jump rope while a girl jumps in the middle. Despite its overall rotating motion, the jump rope is actually vibrating up and down in its fundamental mode while the boys circle their hands gently to keep the rope vibrating. To speed up the jump rope's vibration so that the girl has to jump more often, the boys must circle their hands more quickly and
A. reduce the tension in the rope. B. increase the tension in the rope. C. decrease the height (amplitude) of the arc formed by the swinging rope. D. increase the height (amplitude) of the arc formed by the swinging rope.