9. [0/2 Points] DETAILS PREVIOUS ANSWERS OBINPHYS8 1.P.006. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER A quartz crystal vibrates with a frequency of 53,621 Hz. What is the period of the crystal's motion? ms Need Help? Read It Submit Answer hisMY NOTES ASK YOUR TEACHER PRACTICE ANOTHER A skydiver jumps out of a helicopter and falls freely for 4.4 s before opening the parachute. (a) What is the skydiver's downward velocity when the parachute opens * m/s (b) How far below the helicopter is the skydiver when the parachute opens? * m Need Help? Read It Submit