Question

MC2. Three masses are located on the x axis. A 2.00 kg mass is located at x = +2.00 m; a 3.00 kg mass is located at x = +1.50 m and a 4.00 kg mass is located at x=-1.00 m. Where should you put a 6.00 kg mass so the center of mass of the entire system is located at the origin x = 0? (a) -0.75 m (b)-0.27 m (c) 0.27 m (d) 0.73 m (e) 1.27 m MC3. You are given four springs, each with a spring constant k. What arrangements using all four springs will result in an equivalent spring constant of k? (a) All four springs in series. (b) All four springs in parallel. (c) Three springs in parallel which are then connected in series with the fourth spring. (d) Two springs in parallel then connected in series with the other two springs which themselves are in parallel. (e) No arrangement of the four springs will result in an equivalent spring constant of k. MC4. Two 0.1 kg masses are thrown at a wall. The velocity of both masses is 2.0 m/s. When the masses hit the wall, one of them bounces elastically and the other one sticks to the wall. What is the total impulse to the wall for both masses? (a) 0.2 kg-m/s (b) 0.3 kg-m/s (c) 0.4 kg-m/s (d) 0.5 kg-m/s (e) 0.6 kg-m/s MC5. Two masses, each with a weight W, are hung from a spring scale as shown in the diagram. The reading on the scale is (a) W/4 (b) W/2 (c) W (d) 2W (e) 4W Scale

Answer 1

Canter mas H2) Xm 0 2 -3 4 m6g ,2m x,- 5m 31.om X= ? 2x2 3x1S+4x(-) +6x 4 2+3 t 4+6 43x,54 +6X 6x 3xI. 6 -0.75 m A