(8) 在一項6小時的全脂牛奶脫脂操作過程中含脂肪4%的進料共35000kg，得到兩種產品分別是含0.45%脂肪的脫脂牛奶與含45%脂肪的奶油。請問脫脂牛奶與奶油每小時各生產多少？

計算題（每題二十五分） An electric field is directed out of the page within a circular region of radius R=3.00 cm. The magnitude of the electric field is given by E = (0.500 V/m·s)(1-r/R)t, where t is in seconds and r is the radial distance (r ≤ R). What is the magnitude of the induced magnetic field at radial distance (a) 2.00 cm and (b) 5.00 cm?