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Q. The door has a mass of 44,000 kg, the rotational inertia about a vertical axis through its huge hinges of 8.7x10^4 kg•m2, and a (front) face width of 2.4m. Neglect friction, what steady force, applied at its outer edge and perpendicular to plane of the door, can move it from rest through an angle of 90° in 30 s?

Q. Two trains, each having a speed of 34 km/h, are headed at each other on the same straight track. A bird that can fly 60km/h flies off the front of one train while they is 69 km apart and heads directly for the other train. On reaching other train it flies straight back to first train, and so forth. (We have no idea why a bird would behave in this way.) What is the total distance the bird travels before trains collide?

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