《普通物理》试卷
Physics(B)
Department Specialty NumberName
一. Fill in the blanks (40)
1. In figure, a block B of mass M=15.0kg hangs by a cord from a knot K of mass Mk, which hangs from a ceiling by means of two other cords. The cords have negligible mass, and the magnitude of the gravitational force on the knot is negligible compared to the gravitational force on the block. What are the tensions in the three cords? , , .

2. Two ships, A and B, leave port at the same time. Ship A travels northwest at 24 knots and ship B travels at 28 knots in a direction 400 west of south. (1 knot=1 nautical mile per hour=1852 meters per hour) (a) The magnitude and direction of the velocity of ship A relative B are , ;(b) After what time will the ships be 160 nautical miles apart? .
3. A puck of mass m slides on a frictionless table while attached to a hanging cylinder of mass M by a cord through a hole in the table. What speed keeps the cylinder at rest ? .
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