Ui teligth 3.5 m and mass 30 kg that is leaning against a al liction between the ladder and wall is 0, and that between ladder and floor is 0.25. what is the maximum angle between the ladder and the wall before the ladder starts slipping? a) 150 b) 61.1250 c) 40.30 d) 21.6 e 32.740 4. a 550 n uniform boom is supported by a perpendicular cable attached at 0.8 its length from the boom's hinge on the floor and makes a angle of 62° with the horizontal floor. at the top end of the boom is attached a 1650 n weight. what is the tension in the supporting cable? a) 1291 n b) 3410 n c) 2489.3 n d) 710n e) 1320 n 5. a railroad freight car, mass 15000 kg, is allowed to coast along a level track at a speed of 9 mi/s. t collides and couples with a 50,000 kg loaded second car, initially at rest and with brakes released. what percentage of the initial kinetic energy in the 15000 kg car is preserved in the two coupled cars after collision? a) 6% b) 54% c) 30% d) 23.1% e) 20390 olume of 2859 m3. the density of the air outside the balloon is 1,296 kg/m', and the density of t hot air inside is 0.9 kg/m3. how much weight can the balloon lift? a) 5.792n b) 11100 n c) 7719.3n d) 4120 n e) 2573.1 n a 90 gm meter stick has two objects attached to it, one of 150 gm at the 30 cm mark and the other of 200 gm at the 80 tink is the center of gravity of the system?