180/4=45 т.е., S малого поршня в 45 раз меньше S большого.
<span>V = 2пR/T ; T = 2пR/V ;</span><span>T = 2*3.14*0.4/4 = 0.628</span><span>V = 1/T = 1/0.628 = 1.6</span>