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1. A 0.3-kg block of wood is flating in water what is the magnitude of the buoyant force acting on the block?

2. A stream moving with a speed of 0.5m/s reaches a point where the cross-sectional area of the stream decreases to one-fourth of the original area. What is the water speed in this narrowed portion of the stream?

3. An airplane wign with an average cross-sectional area 10m2(제곱) experiences a lift force 60,000N, What is the difference in air pressure on the average, between the bottom and top wing?

4. The temperawre on a winter day is 5℉. What is temperature in degrees Celsius?