1.V = 1/3Sh = 1/3 * 25. 12 * 2.4 = 20.096 m3 L = V/( 10 * 0.04)= 20.096/( 10 * 0.04)= 50.24m

2. V =1570l =1.57m3s = NR2 = 0.25n (PAI can't play, so N is used instead) H = V/S =1.57/0.25 = 6.28m..

3. r = 2dm = 20cmv = sh = 400n * 2 = 800ncm3g (weight) = 800n * 7.8 = 800 * 3.12 * 7.8 =19468.8g =19.