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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?
A bus makes a trip according to the position time graph shown in the drawing. Find the average velocity (magnitude & direction) of the bus during each of the segments labelled A, B, & C?
When the cylinder is rotating at 2.0 revolutions per second, determine the magnitude of the centripetal acceleration at the outer wall?
A car travels at a speed of 29 m/s around a curve of radius 67 m. What is the net centripetal force required to keep the car from skidding sideway.
There are two major types of aberration (defective image formation) in lenses: spherical and chromatic. Spherical aberration comes from fact that a spherical lens has the property of focusing parallel rays to a single point only approximately.
W hat is balls initial speed
What least heat is needed to bring 80 of water at 20 to the boiling point and completely boil it away? (answere in Joules).
Assume that Newton's law of universal gravitation can be applied to these two students and find the gravitational force (in Newtons) that one student exerts on the other when they are separated by 0.493 m. Consider entering the answer using scient..
The bunchberry flower has the fastest-moving parts ever seen in a plant.at first , the stamen are held by the petals in a bent position, storing elastic energy like a coiled spring.
What is the gauge pressure of the water at the pump? Suppose steady, laminar flow of water, no viscosity, and no air drag on the water jet. The acceleration of gravity is 9.81 m/s2.
Illustrates the difference between acceleration and velocity
The tension in the string when the ball is at the very bottom of the circle is 4.3 N. At the very bottom of the circle, a very sharp knife is suddenly inserted, to cut the string directly below point of support. How far to the right of where the s..
Evaluate with the strength of the earth's gravity at its surface, how much weaker is gravity at a distance of 10 earth's center.
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