2.10

from sympy import symbols, pi, integrate, sqrt
y = symbols('y')
curve1 = y - sqrt(4*y - y2)
curve2 = sqrt(4 - y)
volume = pi * integrate((curve12 - curve2**2), (y, 1, 3))
print("容器的体积:", volume)
g = 9.8
p = 1000
work = p * g * volume
print("至少需要做多少功:", work)

3022