三道英文版的物理题，求翻译并解答！谢谢

1. A nurse counts 76 heartbeats in one minute. What are the period and frequency of the heart's oscillations?
一位护士测得心跳为一分钟76次。这个人的心率和周期各是多少？
答案：周期为1分钟；心率为76次
Period: 1 minute; oscillation: 76

2. New York's 300-m high Citicorp Tower oscillates in the wind with a period of 6.80s. Calculate its frequency of vibration.
纽约300米高的花旗（Citicorp）集团大厦在风中6.80秒摆动一次。计算出振动的频率。
这个你自己求吧

3. Calculate the speed of waves in a puddle that are 0.15m apart and made by tapping the water surface twice each second.
一个水坑中，每秒拍打水两次，可产生0.15米间隔的水波浪。计算水波浪的速度。