Are these right?

1. A student doing jump rope jumps up 15 times in 18 seconds. Calculate the period and frequency of the student. T = Time = 1. ZS cycles 15c F = cycles 15cycle : 0. 833Heriz Time 18 S 2. A panicked student has a heart rate of 90 beats/min. Calculate the period and frequency of the heartbeat . T = Time GO Sec : 0.67 seconds cycles q0 cycles F = cycles gocycles=15Herizz Time Gosecs 3. At the beach this summer, you begin thinking about physics as you watch the ocean. You notice that in 30 seconds, ocean waves have crashed onto the beach 8 times. Calculate the period and frequency of the ocean waves. T= Time = 305 - 3.755 Cycles 8c F = cycles . 86 - 0. 26 7 Hertz The information from problem #3, if the wave crests are 7m apart (meaning that the