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A private airplane left the airport at 1pm with speed 150 mph and its direction was 30 degrees east of north. At 3pm, the airplane reached point A and then changed its speed to 100 mph heading west. At 7pm, it reached point B. The pilot decided to change its direction to 20 degrees east of south, without changing its speed. At 9pm, the plane reached point C. Use OA = ax i + ay j to represent the displacement of the plane from 1pm to 3pm. Use AB = bx i + by j to represent the displacement of the plane from 7pm to 9pm. Use OC = dx i + dy j to represent the position of the plane at 9pm, i.e., the displacement from 1pm to 9pm, measured from the airport. We take East as positive x-direction and North as positive y-direction.
What is frequency of the fork
A current of 7.35 A in a solenoid of length 12.2 cm creates a 0.397-T magnetic field, How many turns does this solenoid contain
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A child throws a ball downward from a tall building. Note that the ball is thrown, not dropped and disregard air resistance. What is the acceleration of the ball immediately after it leaves the child's hand
The age of a piece of wood from an archeological site is to be determined using the Carbon-14 method. The activity of the sample is measured to be 0.655 times the Carbon-14 activity of living plants. What is the age of the sample in years? (The half-..
A nozzle of inner radius 1.05 mm is connected to a hose of inner radius 7.95 mm. The nozzle shoots out water moving at 25.5 m/s. At what speed is the water in the hose moving
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