bstitute this result into Equation (1) find T. EARN MORE REMARKS The acceleration of the second block is the same as that of the first, but negative. When in gets very large compared with m ,, the acceleration of the system approaches g, as expected, because ing is failing neatly freely under the influence of gravity. Indeed, m, is only slightly restrained by the much QUESTION Suppose you weight 760 |4 (about 1 70 lbs) but would find it hard to lift an object weighing 60o i (about 145 (b:). Consider how you could use this simple machine to raise the object, and what you would have to sxemilo pulley hooksa forthe cali ng. you could pull down on the rope, as if pulling yourself up along he end of the rope you would need to exert a force of billion the pulley att the object done end of the cope attached to the calling you could lift the object by pullingy a force of Ecdy toward on your and of the ropes EXERCISE HINTS: GETTING STARTED | I'M STUCK! Suppose that in the same another is attached to the bottom of miiand a constant force f is applied, retarding 180 kg and me plug ky what will reduce the acceleration a N downward 4. 16.19/9.09 Points] DETAILS PREVIOUS ANSWERS One or more external forces are exerted on each object enclosed in a dashed box shown in the figure below. Identify th Field hairs Ironproblem symbolically. PROBLEM Two objects of mass m, and m,, with m. > m are connected by a light, inextensible cord and hung over a frictionless pulley, as in figure (a). Both cord and pulley have negligible mass. Find the magnitude of the acceleration of the system and the tension in the cord. STRATEGY The heavier mass, IN1, accelerates downward, In with amachine. to Two honing System negative : direction. Because the cord can't be stretched, andy diagrams for the ruleetal the accelerations of the two masses are equal in magnitude, but opposite in direction, so that apis esitive and a is negative, and a. Each mass is acted on by a force of tension T in the upward tien and a force of gravity in the downward direction. Figure ( b) shows free-body diagrams for the In masses. Newton's second law for each mass, together with the equation relating the accelerations, istitutes a set of three equations for the three unknowns - ; a, , and 2. SOLUTION id law to each of the THISto Equation (2 ) sides bol Substitute this result to find I. LEARN MORE REMARKS The acceleration gets very large compared; is falling nearly freely under the in lighter in QUESTION Suppose you weigh 760 N (about 1 70 Ibs) but would find it hard to lift an object weighing 500 N (about 115 lbs), Consider how you could use this simple machine to raise the object, and what force you would have to exert to (a) With the pulley hooked to the ceiling, you could pull down on the rope, as if pulling yourself up along N downward. the rope. To raise the object tied to the end of the rape you would need to exert a force of IRWIN (b) With the pulley attached to the object and one end of the rape attached to the ceiling, you could lift the object by pulling with a force of (IIIIII IN directly upward on your end of the rope