lecture10

# lecture10 - Phys 2101 Gabriela Gonzlez F = ma F r = mar F t...

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1 Phys 2101 Gabriela González 2 = a m F t t r r ma F ma F = = r m F r m T F α φ ω = = sin cos 2 τ 2 2 sin r m r m Fr = = = I =

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2 3 We know all of that already!! 4 The figure shows the massive shield door at a neutron test facility at Lawrence Livermore Laboratory; this is the world's heaviest hinged door. The door has a mass of 44,000 kg, a rotational inertia about a vertical axis through its huge hinges of 8.7x10 4 kg · m 2 , and a (front) face width of 2.4 m. Neglecting friction, what steady force, applied at its outer edge and perpendicular to the plane of the door, can move it from rest through an angle of 90° in 30 s?
3 5 In the figure, a block has mass M = 500 g, the other has mass m = 460 g, and the pulley, which is mounted in horizontal frictionless bearings, has a radius of 5.00 cm. When released from rest, the heavier block falls 75.0 cm in 5.00 s (without the cord slipping on the pulley). (a) What is the magnitude of the blocks' acceleration? What is the tension in the part of the cord that supports (b) the heavier block and (c) the lighter block? (d) What is the magnitude of the pulley's angular acceleration? (e) What is its rotational inertia? 6 (a) What is the magnitude of the blocks' acceleration? What is the tension in the part of the cord that supports (b) the heavier block and (c) the lighter block? (Tensions are not equal any more!!!)

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## This note was uploaded on 12/01/2011 for the course PHYS 2101 taught by Professor Grouptest during the Fall '07 term at LSU.

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lecture10 - Phys 2101 Gabriela Gonzlez F = ma F r = mar F t...

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