: Một khối gỗ hình bán trụ tâm C, đồng chất có khối lượng riêng  bán kính R nổi trên mặt chất lỏng, mặt phẳng
của bán trụ hướng lên trên. Khi khối gỗ cân bằng tâm C cách mặt
thoáng chất lỏng khoảng
2
R
và có tiết diện thẳng như hình 2.
a. Tính khối lượng riêng D của chất lỏng.
b. Từ vị trí cân bằng, ấn vào giữa bán trụ xuống theo phương
thẳng đứng một đoạn rất nhỏ rồi thả nhẹ. Hãy xác định chu kỳ dao động nhỏ theo phương thẳng
đứng của bán trụ.

The boy of mass 30 kg is at r1= 2 meters from the fulcrum. of the girl is 45 kg, at what r2 must she sit so that they are balanced ?

The bubba chump shrimp company processes and packages shrimp for sale to wholesale seafood distributors. the shrimp are transported to the main plant by trucks that carry 1,000 pounds (lb) of shrimp. once the continuous flow processing of the shrimp begins, no inventory is allowed in buffers due to spoilage and all of the shrimp must be processed within 12 hours to prevent spoilage. the processing begins at the sorter, where the trucks dump the shrimp onto a conveyor belt that feeds into the sorter, which can sort up to 500 lb per hour. the shrimp then proceed to the desheller, which can process shrimp at the rate of 400 lb per hour. however, after 3 hours and 45 minutes of processing, the desheller must be stopped for 15 minutes to clean out empty shrimp shells that have accumulated. the veins of the shrimp are then removed in the deveining area at a maximum rate of 360 lb per hour. the shrimp proceed to the washing area, where they are processed at 750 lb per hour. finally, the shrimp are packaged and frozen. what is the daily process capacity of the processing plant (excluding the packaging and freezing)?

Acar drives toward the right over the top of a hill, as shown below. which arrow represents the centripetal acceleration? w x y z