81. From the reading when the elevator was at rest, we know the mass of the object is m= (65 N)/(9.8 m/s2) = 6.6 kg. We choose +yupward and note there are two forces on the object:mgdownward and Tupward (in the cord that connects it to the balance; Tis the reading on the scale by Newton’s third law). (a) “Upward at constant speed” means constant velocity, which means no acceleration.
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This note was uploaded on 05/17/2011 for the course PHY 2049 taught by Professor Any during the Spring '08 term at University of Florida.