10. (2) the smallest number of teeth on a 20" pressure angle spur gearset, unning with itselt, is: a 12 teeth 13 teeth c) 15 teeth d) 18 teeth e) none of these 11. (2) a 350 rpm bearing under 1600 i dynamic load must last 12,000 hours with 90% reliability. select one with load rating a) 5,050 ib b) 300 b c) 10,100 ib e) none of these 12. (2)is conserved across meshing a) angular velocity ) torque d) e) radial velocity none of these 13. (2) backlash can be a significant challenge with a) helical b spur c) spiral d) hypoid e) none of these 14. (2)gears are most efficient b) spiral spur 15. (2) gears come in both parallel or a) rack and pinion b) hypoid c) spiral differential e)helical

4.at 0 ºc, some amount of energy is required to change 1 kg of water from a solid into a liquid. if you had a 2 kg piece of ice, what effect would this have on the amount of thermal energy required to change the water from a solid to a liquid? it would require more energy to change solid water into liquid water because there are more molecules in this larger piece of ice. it would still require the same amount of energy to change solid water into liquid water because the entire piece of ice would still gain the same amount of energy in each case. it would require energy to be removed from the 2 kg piece of ice. the larger piece of ice already has more total energy than the smaller piece of ice, so energy must be removed for the ice to become liquid. it would require less energy to change solid water into liquid water because the energy would spread through the ice more quickly and the ice already has a larger total amount of energy because it is larger than a 1 kg piece of ice.